DISSERTATIONEN - MASTERARBEITEN - BACHELORARBEITEN 2022

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[PUBDB-2022-07471] Dissertation / PhD Thesis

Assalauova, D. ; Stierle, A. ; Vartaniants, I.
Analysis of single particle imaging experiments at X-ray Free-Electron Lasers

169 pp. (2022) [10.3204/PUBDB-2022-07471] = Dissertation, University of Hamburg, 2022

Single particle imaging (SPI) is a novel technique in X-ray science aimed at reconstructing the three-dimensional structure of nanoscale objects. Studying the inner structure of biological particles has become increasingly crucial, as evidenced by the pandemic of coronavirus disease (COVID-19) showing the necessity of scientific development in this field. [...]

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[PUBDB-2024-08050] Dissertation / PhD Thesis

Aufleger, L. ; Pfeifer, T. ; Wolf, A.
Nonlinear spectroscopy on an autoionizing two-electron resonance in intense, extreme ultraviolet fields at a free-electron laser

Heidelberg University Library 119 pp. (2022) = Dissertation, Heidelberg University, 2022

In this work, the influence of intense extreme-ultraviolet (XUV) fields on helium is experimentally investigated. Therefore, XUV pulses from a free-electron laser (FEL) are combined with transient absorption spectroscopy (TAS) and explored with numerical quantum-mechanical simulations. [...]

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[PUBDB-2022-07532] Dissertation / PhD Thesis

Barbosa Martins, V. ; Berge, D. ; Garczarczyk, M. ; et al
Probing the cosmic-ray pressure in the Virgo Cluster and the origin of the very-high-energy gamma rays of M87 with H.E.S.S. and CTA

Humboldt-Universität zu Berlin 182 pp. (2022) [10.18452/24909] = Dissertation, Humboldt Universität zu Berlin, 2022

The High Energy Stereoscopic System (H.E.S.S.) is an array of five Imaging Atmospheric Cherenkov Telescopes (IACTs) located in Namibia. The H.E.S.S. [...]

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[PUBDB-2022-01470] Book/Dissertation / PhD Thesis

Bate, C. ; Foster, B.
Study of nitrogen-enriched niobium and its influence on the performance on superconducting RF cavities
[DESY-THESIS-2022-005]

Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 127 pp. (2022) [10.3204/PUBDB-2022-01470] = Dissertation, Universität Hamburg, 2022

The structure and composition of niobium, the current state-of-the-art material for superconductingradio-frequency (SRF) cavities, are of extreme importance in understandingthe operation behaviour of cavities. In recent years, the use of nitrogen to improve this behaviourhas been widely studied. [...]

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[PUBDB-2022-06383] Dissertation / PhD Thesis

Benedyk, T. ; Graham, S.
Structural and functional characterisation of pUL21, an $α$-herpesvirus phosphatase adaptor protein

218 pp. (2022) = Dissertation, University of Cambridge, 2022

The current CoV-SARS-2 pandemic exemplifies the profound impact viruses can have upon our lives. Virus infection is a complex process where viral proteins cooperate to exploit host cell metabolism while evading immune responses. [...]

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[PUBDB-2022-06762] Dissertation / PhD Thesis

Bermudez Macias, I. J. ; Fruehling, U. ; Duesterer, S. ; et al
Free electron laser pulse characterization by THz streaking

129 pp. (2022) [10.3204/PUBDB-2022-06762] = Dissertation, University of Hamburg, 2022

The goal of this dissertation was to investigate a reliable single-shot pulse duration diagnostic tool for the pulse duration and wavelength range delivered at the Free Electron LAser of Hamburg (FLASH). At Self-Amplified-Spontaneous-Emission-based free-electron lasers (FELs), the radiation parameters - duration, arrival time, energy, spectrum, and spatial distribution - differ for each pulse. [...]

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[PUBDB-2022-07422] Book/Dissertation / PhD Thesis

Bredt, P. ; Reuter, J. ; Moortgat-Pick, G.
Automated NLO Electroweak Corrections to Processes at Hadron and Lepton Colliders
[DESY-THESIS-2022-026]

Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 205 pp. (2022) [10.3204/PUBDB-2022-07422] = Dissertation, Universität Hamburg, 2022

In order to search for new physics at collider experiments it is necessary for Monte-Carlo (MC) event generators to simulate Standard Model (SM) physics to the highest possible level of precision. The current precision frontier for predictions from the SM is at an unprecedented accuracy level for observables at the Large Hadron Collider (LHC): Perturbative corrections to at least next-to-next-to-leading order (NNLO) in the strong coupling constant $\alpha_s$ and next-to-leading order (NLO) in the electromagnetic coupling constant $\alpha$ must be included in the calculations. [...]

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[PUBDB-2022-01190] Dissertation / PhD Thesis

Brueckner, D. B. ; Schroer, C. ; Falkenberg, G.
Self-Absorption Corrected X-Ray Microtomography with Structural and Elemental Contrast

Hamburg : Staats- und Universitätsbibliothek Hamburg 119 pp. (2022) [10.3204/PUBDB-2022-01190] = Dissertation, University of Hamburg, 2021

X-ray fluorescence tomograms of large or highly absorbing samples often suffer from self-absorption effects. For qualitative and quantitative results, it is necessary to correct these effects.In this thesis, a fully 3D self-absorption corrected reconstruction algorithm for X-ray fluorescence tomography datasets is presented. [...]

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[PUBDB-2022-05177] Book/Master Thesis

Chen, Z. ; Gallo-Voss, E. ; Cardini, A.
Tau reconstruction in CMS exploiting machine learning techniques
[DESY-THESIS-2022-021]

Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 55 pp. (2022) [10.3204/PUBDB-2022-05177] = Masterarbeit, Universität Hamburg, 2022

Reconstruction of hadronically decaying tau leptons (denoted as $\tau_h$) in the CMS experiment at the Large Hadron Collider has been historically performed with the hadron-plus-strip (HPS) algorithm. This thesis covers a study to improve the tau decay mode (DM) reconstruction using machine learning techniques. [...]

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Chopra, P. ; Schnell, M.
Astrochemically Relevant Polycyclic Aromatic Hydrocarbons Investigated using Ultrafast Pump-probe Spectroscopy and Near-edge X-ray Absorption Fine Structure Spectroscopy

[PUBDB-2022-06761] Dissertation / PhD Thesis

148 pp. (2022) [10.3204/PUBDB-2022-06761] = Dissertation, Christian-Albrechts-Universität zu Kiel, 2022

The chemical complexity of the interstellar medium (ISM) has long interested researchers, with a major focus being a set of molecules called polycyclic aromatic hydrocarbons (PAHs). These molecules play a significant role in our understanding of the ISM by elucidating the physical environments that surround them. [...]

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[PUBDB-2022-00714] Book/Dissertation / PhD Thesis

Dartsch, M. ; Gruebel, G. ; Pearson, A.
Higher-Order Correlations in Complex Liquids
[DESY-THESIS-2022-003]

Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 113 pp. (2022) [10.3204/PUBDB-2022-00714] = Dissertation, Universität Hamburg, 2022

Colloidal dispersions show a peculiar rheological behavior known as shear-thinning,that is the viscosity of a sample decreases with increasing shear rate. In thiswork the underlying structural changes that lead to this effect are studied byusing samples consisting of polyacrylate-coated silica nanoparticles dispersed inpolyethylene glycol-200. [...]

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[PUBDB-2022-06373] Book/Dissertation / PhD Thesis

Dattola, F. ; Glazov, A. ; Tackmann, K. ; et al
Searches for the rare $B^+ \to K^{+} \nu \bar \nu$ and $B^0 \to K^{*0} \nu \bar \nu$ decays using an inclusive tagging method at the Belle II experiment
[DESY-THESIS-2022-023]

Hamburg : Verlag Deusches Elektronen-Synchrotron DESY, DESY-THESIS 208 pp. (2022) [10.3204/PUBDB-2022-06373] = Dissertation, Universität Hamburg, 2022

This thesis presents two searches for the rare $B \to K^{(*)} \nu \bar \nu$ decays at the Belle II experiment, operating at the SuperKEKB asymmetric-energy electron-positron collider, at the KEK laboratories in Tsukuba, Japan.The $B \to K^{(*)} \nu \bar \nu$ decays are based on the $b \to s \nu \bar \nu$ flavour-changing neutral-current transition. This process is forbidden at the Born level in the Standard Model (SM) and can only occur at higher orders in SM perturbation theory, at the cost of large suppression. [...]

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[PUBDB-2022-07128] Bachelor Thesis

Dharmababu, A. ; Martins, M. ; Beye, M.
Untersuchung von VO$_2$ Mikrostrukturen durch abbildende Spektroskopie mit weicher Röntgenstrahlung

45 pp. (2022) = Bachelorarbeit, Universität Hamburg, 2022

This bachelor thesis investigates VO$_2$ microstructures. More specifically, the special property of the phase transition of VO$_2$ is examined in more detail [...]

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[PUBDB-2024-00899] Master Thesis

Dolling, S. ; Stierle, A. ; Ruebhausen, M.
CO Adsorption on PdPt Alloy Nanoparticles

147 pp. (2022) [10.3204/PUBDB-2024-00899] = Masterarbeit, University of Hamburg, 2022

Platinum palladium alloy nanoparticles are of high interest because of their role ascatalysts for different processes, including exhaust control and methane oxidation. Cata-lyst behavior is determined by the shape, structure and alloy composition of the particles.To enhance catalyst efficiency, it is thus necessary to improve our understanding of thestructure of the nanoparticles and the active adsorption sites. [...]

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[PUBDB-2022-00146] Book/Dissertation / PhD Thesis

Dörner, S. ; Bari, S. ; Pearson, A.
A comparative study on the photodissociation of gas-phase peptides in the VUV and soft X-ray regimes with a special focus on the influence of the methionine residue
[DESY-THESIS-2022-002]

Hamburg : Verlag Deutsches Elektronen Synchrotron DESY, DESY-THESIS 136 pp. (2022) [10.3204/PUBDB-2022-00146] = Dissertation, Universität Hamburg, 2021

One decade ago, by the combination of electrospray ionization sources and state-of-the-art mass spectrometry instruments with synchrotron light sources it became possible to perform photon-energy-resolved experiments on the photodissociation of biomolecular systems in the vacuum-ultraviolet (VUV) and soft X-ray regimes. In the following years, VUV action spectroscopy and near-edge X-ray absorption mass spectrometry (NEXAMS) have proven to be powerful and versatile analytical tools for studies on the electronic and spatial structures of peptides and proteins. [...]

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[PUBDB-2022-03202] Master Thesis

Edelmann, M. ; Wollenhaupt, M. ; Kärtner, F.
Development of Nonlinear and Ultra-low Noise Fiber Technologies

67 pp. (2022) [10.3204/PUBDB-2022-03202] = Masterarbeit, University of Oldenburg/HS Emden Leer, 2021

Fiber-optic technologies for the generation of ultra-low noise optical pulse trains have asevere impact on a great variety of scientific fields and industrial applications such asfrequency metrology, synchronization and timing in free-electron laser facilities and particle accelerators, photonic microwave generation and quantum technologies. The fasttechnological progression of these applications necessitates a constant improvement ofthe underlaying fiber-optic laser systems in every aspect. [...]

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[PUBDB-2022-01302] Master Thesis

Eggers, J. ; Zemke, J. M. ; Küpper, J.
Solution of the vibrational Schrödinger equation using neural networks

90 pp. (2022) = Masterarbeit, University of Hamburg, 2022

Two numerical methods using neural networks for the solution of the time independent Schrödinger equation are presented. The use of neural networks is motivated by the curse of dimensionality for classical methods. [...]

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[PUBDB-2023-00335] Dissertation / PhD Thesis

Ehm, T. ; Beck, R. ; Raedler, J.
Self-assembly of intrinsically disordered peptide amphiphiles

Munich : Ludwig-Maximilians-Universität München 127 pp. (2022) [10.5282/EDOC.30597] = Dissertation, Ludwig-Maximilians-Universität München, 2022

Intrinsically disordered peptide amphiphiles (IDPAs) are a novel class of molecules with great potentialif incorporated into nanocarriers. IDPAs combine hydrocarbon chains that originate fromnatural lipids and polypeptide chains composed of sequences that do not fold into a static structurebut remain intrinsically disordered, fluctuating between various conformations. [...]

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[PUBDB-2022-06443] Book/Master Thesis

Elhag, H. S. M. ; Bhattacharya, S. ; Melzer-Pellmann, I. ; et al
Tagging of Leptonically Decaying Boosted Top Quarks Using Machine Learning
[DESY-THESIS-2022-024]

Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 72 pp. (2022) [10.3204/PUBDB-2022-06443] = Masterarbeit, Universität Hamburg, 2022

The study of boosted top quarks is very important for probing a wide variety of new physics models. When considering the leptonic channel decay mode of highly boosted top quarks, the axis of the jet resulting from the bottom quark gets very close in distance to the lepton. [...]

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[PUBDB-2022-07553] Bachelor Thesis

Erberk, P. ; Martins, M. ; Beye, M.
Full-field Bragg imaging of microscopic domains in a quantum material with phase coexistence

42 pp. (2022) = Bachelorarbeit, University of Hamburg, 2022

Y$_{0.63}$Ca$_{0.37}$TiO$_{3}$ is a quantum material that experiences a highly unusual metal-insulator transition: Across a very large temperature range between 100 K and 200 K, this material turns from conductive at low temperatures to being insulating at higher temperatures, which is the opposite transition of materials with similar properties such as VO$_2$. Earlier studies demonstrated that within this temperature range, the material exists in two different phases that grow in elongated domains: A conductive orthorhomic phase and an insulating monoclinic phase. [...]

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[PUBDB-2022-04255] Book/Dissertation / PhD Thesis

Estevez Banos, L. I. ; Jung, H. ; Haller, J.
Measurement of multi-differential dijet cross sections in pp collisions at $\sqrt{s}$ = 13 TeV.
[DESY-THESIS-2022-015]

Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 237 pp. (2022) [10.3204/PUBDB-2022-04255] = Dissertation, University of Hamburg, 2022

The understanding of the theory of strong interactions in the context of the Standard Model is of great interest to particle physics and its developments. The measurements andthe improvement of the theoretical predictions would allow us to get closer to future findings of new physics by discriminating better between backgrounds produced mainly by stronginteractions. [...]

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[PUBDB-2023-03931] Master Thesis

Ewerhardt, P. ; Koziej, D. ; Caddeo, F.
An Operando Total X-Ray Scattering Study of Photoactive Thin-Films for Oxygen Evolution in Photoelectrochemical Cells

83 pp. (2022) = Masterarbeit, University of Hamburg, 2022

Transition metal oxides are promising materials for photoanodes in devices for photoelectrochmical water splitting. TiO$_2$ was the first photoactive material used in an electrochemical cell in 1972 and recently also hematite ($\alpha$-Fe$_2$O$_3$) has drawn much attention [...]

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[PUBDB-2023-00336] Dissertation / PhD Thesis

Fanova, A. ; Stepanek, M.
Self-assemblies based on hydrophilic polymers in aqueous media

Prague 111 pp. (2022) = Dissertation, Charles University, 2022

This doctoral thesis is devoted to investigation of self-assemblies based on hy-drophilic polymers (both homopolymers and block copolymers) in aqueous media.Specifically, we focused on two classes of systems: (i) hydrophilic polymers whoseself-assembly in aqueous solutions is driven by association of terminal hydrophobicgroups and (ii) double hydrophilic block polyelectrolytes whose self-assembly oc-curs via electrostatic complexation of polyelectrolyte blocks. For characterization offormed assemblies, we mostly used different scattering techniques (light scattering,small-angle X-ray scattering) in a combination with a number of supplementarymethods including microscopy, fluorometry and calorimetry.Keywords: hydrophilic polymers, block copolymers, association, self-assembly,micelles, scattering

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[PUBDB-2022-02524] Dissertation / PhD Thesis

Ganesa Subramanian, M. K. ; Oriol Vendrell, P. D. ; Santra, R.
Investigation of inner-shell and subsequent field-induced processes in mono- and diatomic systems

68 pp. (2022) [10.3204/PUBDB-2022-02524] = Dissertation, Universität Hamburg, 2015

With advent of modern experimental techniques using light sources, the dynamics initiated by inner-shell processes such as, inner-shell ionization followed by Auger-decay, and their subsequent dynamics can be investigated in their fundamental timescales. Theoretical description supported by computational methods are needed to complement the experimental investigations [1]. [...]

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[PUBDB-2024-00871] Dissertation / PhD Thesis

Garrappa, S. ; Franckowiak, A. ; Berge, D. ; et al
Gamma-ray blazars as candidate sources of high-energy neutrinos

Humboldt-Universität zu Berlin 219 pp. (2022) [10.18452/25359] = Dissertation, HU Berlin, 2022

Nach der Entdeckung eines diffusen Flusses hochenergetischer astrophysikalischer Neutrinos durch das IceCube South Pole Neutrino Observatory im Jahr 2013 sind die Quellen, die für den Großteil dieser Emission verantwortlich sind, immer noch unbekannt. Blazare, jene AGN mit einem relativistischen Jet, der auf die Erde zeigt, gelten als Hauptkandidaten für die Beschleunigung der kosmischen Strahlung und die Produktion hochenergetischer Neutrinos. [...]

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Gay, J. ; Merkel, S.
Microstructures and anisotropy of pyrolite in the Earth’s lower mantle : insights from high pressure/temperature deformation and phase transformation experiments

[PUBDB-2024-06079] Dissertation / PhD Thesis

201 pp. (2022) = Dissertation, Univ. Lille, 2022

Microstructures in mantle rocks impact the way seismic waves travel through the Earth and are dependent on the pressure, temperature, and deformation applied to the rock. At approximately 660 km depth, an increase in seismic wave velocities mark a distinct boundary that separates the upper and lower mantle. [...]

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[PUBDB-2022-07498] Dissertation / PhD Thesis

Genovese, L. ; Assmann, R. ; Hillert, W.
Laser-Driven Anti-Resonant Fibers: Acceleration and Phase Space Manipulation of Relativistic Electron Beams

131 pp. (2022) [10.3204/PUBDB-2022-07498] = Dissertation, University of Hamburg, 2022

In this work of thesis, applications of photonic crystal fiber to advanced accelerator concepts are investigated. Due to the high damage threshold of dielectric material in the optical regime, dielectric laser accelerators can support $\mathcal{O}$(GV/m) as accelerating field which motivates to investigate laser-driven dielectric structures. [...]

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Gielnik, M. ; Kozak, M. ; Wärmländer, S. K. T. S.
Folding and aggregation of the humanprion protein: biophysical studies ofinteractions with metal ions and the NCAM1-Aβ peptide construct

[PUBDB-2022-06385] Dissertation / PhD Thesis

184 pp. (2022) = Dissertation, Adam Mickiewicz University, 2022

Misfolding of the cellular prion protein (PrPC) is associated withthe development of fatal neurodegenerative diseases known asTransmissible Spongiform Encephalopathies (TSEs), such asCreutzfeldt-Jakob disease in humans and the corresponding “madcow” disease in cattle. The misfolding of PrPC is not unique process:under specific conditions all proteins can undergo structuraltransitions from a native soluble state into insoluble and fibrillaramyloid state. [...]

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[PUBDB-2022-07911] Master Thesis

Gierke, A. ; Gruebel, G. ; Gorkhover, T.
Design of a liquid jet environment for X-ray scattering experiments on complex liquids

74 pp. (2022) = Masterarbeit, University of Hamburg, 2022

In this thesis two applications of liquid jets were studied. Firstly, the combination between the rheology technique and X-ray scattering approach on complex fluids was investigated. [...]

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[PUBDB-2022-02613] Dissertation / PhD Thesis

Gimenez Grau, A. ; Liendo Cordova, P. ; Arutyunov, G.
Topics in the Superconformal and Defect Conformal Bootstrap

368 pp. (2022) [10.3204/PUBDB-2022-02613] = Dissertation, University of Hamburg, 2022

Conformal field theory has varied applications, ranging from critical phenomena in statistical and condensed matter physics, to formal aspects of quantum gravity. In recent years, the conformal bootstrap has become one of the most promising frameworks to study conformal field theory, both at the perturbative and non-perturbative level. [...]

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[PUBDB-2022-03578] Book/Dissertation / PhD Thesis

Gonzalez Caminal, P. ; D'Arcy, R. ; Hillert, W.
Time-Resolved Phase-Space Characterisation of Plasma-Wakefield-Accelerated Electrons at FLASHForward
[DESY-THESIS-2022-014]

Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 262 pp. (2022) [10.3204/PUBDB-2022-03578] = Dissertation, Universität Hamburg, 2022

A plasma can sustain electric fields orders of magnitude larger than those attainable with the conventional radio-frequency (RF) technology typically used in particle accelerators, which are limited to ∼ 100 MV/m due to electrical breakdowns occurring at the metallic boundary of the accelerating structures. In a particle-beam-driven plasma-wakefield accelerator (PWFA), a charge-density wake sustaining field gradients in excess of GV/m is driven by the passage of a relativistic high-intensity particle bunch through a plasma. [...]

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[PUBDB-2023-00202] Dissertation / PhD Thesis

Guida, A. ; Ferrando, J. ; Marzani, S.
Studies of the Drell-Yan process at the Large Hadron Collider

Università degli studi di Genova 200 pp. (2022) [10.15167/GUIDA-ALESSANDRO_PHD2022-07-26] = Dissertation, University of Genova, 2022

High energy physics experiments are performed at the Large Hadron Collider (LHC) at CERN colliding bunches of protons at energies up to 13TeV. A fundamental input for any physics study at the LHC is the knowledge of the proton structure in high energy collisions. [...]

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[PUBDB-2023-03937] Master Thesis

Harouna-Mayer, S. ; Koziej, D. ; Billinge, S. J. L.
3D Atomic Pair Distribution Function of a Textured Platinum Thin Film

52 pp. (2022) = Masterarbeit, University of Hamburg, 2022

he Atomic Pair Distribution Function (PDF) is the Fourier analysis of total scattering data including Bragg as well as diffuse scattering. Contrary to the conventional diffraction studies, which solely consider Bragg scattering contributions and thus only access to the long range ordering information, the PDF yields short and intermediate range ordering information [...]

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[PUBDB-2022-00642] Book/Dissertation / PhD Thesis

Hartwell, S. ; Laarmann, T.
Coherent femtosecond pulse shaping towards the short wavelength regime
[DESY-THESIS-2022-001]

Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 124 pp. (2022) [10.3204/PUBDB-2022-00642] = Dissertation, Universität Hamburg, 2021

Since the advent of the first camera, flashes of light have been an integral tool in observing the world around us. Following the creation of the laser, these flashes of light have been getting temporally shorter and shorter, allowing faster and faster phenomena to be observed. [...]

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[PUBDB-2022-05341] Dissertation / PhD Thesis

Henke, N. ; Papathanasiou, G. ; Arutyunov, G.
Applications of tropical geometry and cluster algebras to multi-particle scattering amplitudes

168 pp. (2022) [10.3204/PUBDB-2022-05341] = Dissertation, University of Hamburg, 2022

Scattering amplitudes are key observables that describe the probability of possible outcomes in the interaction of fundamental particles. These interactions are investigated in particle colliders, where two beams of high-energy particles are collided. [...]

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[PUBDB-2022-06702] Dissertation / PhD Thesis

Heuchel, D. ; Sefkow, F. ; Herrmann, N.
Particle Flow Studies with Highly Granular Calorimeter Data

Heidelberg : Heidelberg University Library 241 pp. (2022) = Dissertation, University of Heidelberg, 2022

The particle flow reconstruction concept is based on a set of pattern recognition algorithms promising to deliver unprecedented jet energy resolution in a future lepton collider experiment. One of the key requirements for this concept is highly granular calorimetry, capable of revealing the sub-structure of particle showers. [...]

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[PUBDB-2022-07873] Dissertation / PhD Thesis

Holmes, S.
Molecular Imaging using Serial Femtosecond Crystallography

La Trobe 225 pp. (2022) [10.26181/20001665.V1] = Dissertation, La Trobe University, 2022

Serial femtosecond crystallography (SFX) is a technique that has allowed scientists to determine the structure of proteins to an atomic resolution using sub-micron sized crystals. Withthe development of SFX, the structural determination of crystals too small to be measured using conventional crystallography, could be solved. [...]

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[PUBDB-2022-01913] Book/Master Thesis

Hörsch, J. M. ; Osterhoff, J. ; Hillert, W.
Electron Temperature Measurements in Discharge Capillaries
[DESY-THESIS-2022-009]

Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 96 pp. (2022) [10.3204/PUBDB-2022-01913] = Masterarbeit, Universität Hamburg, 2022

The electron temperature of hydrogen and argon plasmas, that were produced at gas pressures of a few millibar and with electron densities in the range of $1\times10^{15} \text{cm}^{-3}$ to $1\times10^{17} \text{cm}^{-3}$, were investigated. These working points are typical of plasma sources which are used in beam-driven plasma wakefield accelerators such as FLASHForward. [...]

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[PUBDB-2022-01712] Dissertation / PhD Thesis

Immoor, J. ; Marquardt, H. ; Liermann, H.-P.
Experimental deformation of mantle minerals at simultaneous high-pressure and high-temperature

106 pp. (2022) [10.3204/PUBDB-2022-01712] = Dissertation, University of Bayreuth, 2022

Understanding the dynamics of the solid Earth and their relation to plate tectonics requires an understanding of the processes that occur in Earth’s lower mantle. For example, seismic anisot-ropy observations can be used to map mantle flow patterns. [...]

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[PUBDB-2022-06381] Book/Dissertation / PhD Thesis

Jensen, M.
Experimental Protein Dynamics and its Role inPredicting Protein Function

48 pp. (2022) = Dissertation, University of Gothenburg, 2022

By studying proteins we learn about the processes that control life, such as important procedures in the body, diseases and eventually find more targeted cures for many diseases. Proteins are constantly being built up and decomposed in living organisms. [...]

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[PUBDB-2022-01666] Book/Dissertation / PhD Thesis

Jomhari, N. Z. ; Geiser, A. ; Gallo-Voss, E.
Measurement of Total and Differential Charm Cross Sections at 7 TeV with the CMS Detector
[DESY-THESIS-2022-006]

Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 128 pp. (2022) [10.3204/PUBDB-2022-01666] = Dissertation, Universität of Hamburg, 2022

This thesis presents the total charm cross section measurement in the full kinematic phase space of pp collisions at the LHC. It was performed using open data (2010) from the CMSexperiment at a center-of-mass energy of 7 TeV due to its special low p$_{\mathrm{T}}$ tracking. [...]

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[PUBDB-2023-00760] Master Thesis

Kamel, K. ; Bellandi, A. ; Eichler, A. ; et al
Development of a Quasi-LPV Frequency Controller for Continuous-Wave Superconducting Radio Frequency Cavities

Hamburg : Technische Universität Hamburg 50 pp. (2022) = Masterarbeit, Technische Universität Hamburg, 2022

Cryo-Module Test Bench (CMTB) is a research facility to study particle accelerators equipped with Superconducting Radio Frequency (SRF) cavities and is currently used to perform studies on the Continuous Wave (CW) mode of operation of SRF linear accelerators. These studies aim to develop new technologies for the proposed CW upgrade of the European XFEL, the world’s largest superconducting linear accelerator used to produce X-Ray pulses for scientific purposes. [...]

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[PUBDB-2022-05175] Book/Dissertation / PhD Thesis

Kaminski, M. ; Weckert, E. ; Stierle, A. ; et al
Studying Magnetism with X-Ray Standing Waves
[DESY-THESIS-2022-020]

Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 218 pp. (2022) [10.3204/PUBDB-2022-05175] = Dissertation, Universität Hamburg, 2022

A new method for studying the magnetic structures at the atomic level was developed within the scope of this thesis. A combination of the site-selectivity of the diffraction-based x-ray standing waves (XSW) technique and sensitivity to magnetic properties of the x-ray magnetic circular dichroism (XMCD) spectroscopy leads to a completely new perspective. [...]

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[PUBDB-2022-02973] Book/Dissertation / PhD Thesis

Kaveh, H. ; Mankel, R. ; Gallo-Voss, E.
Simplified template cross-section measurement for Higgs boson decay to b-quarks in association with a vector boson with the full Run 2 CMS dataset
[DESY-THESIS-2022-012]

Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS-2022-012 144 pp. (2022) [10.3204/PUBDB-2022-02973] = Dissertation, Universität Hamburg, 2022

The Simplified Template Cross-Section (STXS) measurement of the 125 GeV Higgs boson decaying to a pair of b-quarks, produced in association with a vector boson is presented. The analysis is performed on the full Run 2 data collected at the Compact Muon Solenoid detector (CMS) at Large Hadron Collider (LHC) corresponding to the integrated luminosity of 138 $\text{fb}^{-1}$. [...]

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[PUBDB-2022-07862] Book/Dissertation / PhD Thesis

Kellermeier, M. ; Assmann, R. ; Hillert, W.
Terahertz driven waveguides following radio-frequency design principles for electron bunch acceleration and manipulation
[DESY-THESIS-2023-001]

Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 198 pp. (2022) [10.3204/PUBDB-2022-07862] = Dissertation, Universität Hamburg, 2022

Emerging high power THz sources pave the road for THz-driven manipulation and acceleration of ultra-shortelectron bunches, opening a path to an order of magnitude higher accelerating gradients than conventional radiofrequency (RF)-driven structures. In this thesis, THz waveguides are studied with theoretical methods that were established in the field of RFengineering for the characterization of accelerating devices. [...]

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[PUBDB-2023-00816] Master Thesis

Kellhammer, D. ; Henri, M.
Bildverarbeitung filamentöser Schimmelpilze kultiviert mit Mikro- und Makropartikeln

Freising : School of Life Sciences 87 pp. (2022) = Masterarbeit, Technische Universität München, 2022

The numerous advantages of filamentous fungal-pellets for the production of various products, such as citric acid, attract the attention of researchers and industrial engineers. In this regard, it is important to study the morphology of the fungal pellets, as it has a great impact on productivity. [...]

[PUBDB-2022-01017] Dissertation / PhD Thesis

Khubbutdinov, R. ; Vartaniants, I. ; Schroer, C. ; et al
Statistical Properties of the X-ray Radiation at Large Scale Facilities

244 pp. (2022) [10.3204/PUBDB-2022-01017] = Dissertation, University of Hamburg, 2021

The present thesis is focused on the extensive analysis of statistical properties of modern X-ray sources at Large Scale Facilities, such as the 4th generation high-energy storage ring PETRA IV, European XFEL (EuXFEL), and XFEL at Pohang Accelerator Laboratory (PAL-XFEL). Special attention is paid to the effects that may decrease coherence characteristics and impact source properties at these facilities. [...]

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[PUBDB-2023-00364] Master Thesis

Laudamus, K. ; Gallo-Voss, E. ; Stapf, B.
Studies of di-Higgs production at the FCC-hh in the $HH \to b\bar{b} ZZ^∗ \to bb\ell\ell \nu\nu$ channel

Hamburg : University of Hamburg 53 pp. (2022) = Masterarbeit, University of Hamburg, 2022

The FCC-hh is a proposed circular hadron collider at an energy of 100 TeV. Thetotal integrated luminosity is expected to be around 30 ab$^{−1}$. [...]

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[PUBDB-2022-05063] Dissertation / PhD Thesis

Ledoux, E. ; Merkel, S. ; Jacob, D.
Transformation and deformation microstructures in the Earth's mantle: application to periclase and wadsleyite

275 pp. (2022) = Dissertation, Université de Lille, 2021

The microstructure of rocks depends on the conditions of pressure, temperature and deformation they undergo. In the Earth's mantle, microstructures affect the seismic signals, in the form of seismic anisotropy, for instance. [...]

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[PUBDB-2022-06764] Dissertation / PhD Thesis

Lever, F. ; Guehr, M.
Probing the ultrafast dynamics of 2-Thiouracil with soft x-rays

Universität Potsdam 131 pp. (2022) [10.3204/PUBDB-2022-06764] = Dissertation, Universität Potsdam, 2022

Understanding the changes that follow UV-excitation in thionucleobases is of great importance for the study of light-induced DNA lesions and, in a broader context, for their applications in medicine and biochemistry. Their ultrafast photophysical reactions can alter the chemical structure of DNA - leading to damages to the genetic code - as proven by the increased skin cancer risk observed for patients treated with thiouracil for its immunosuppressant properties. [...]

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[PUBDB-2022-03557] Book/Dissertation / PhD Thesis

Lidrych, J. ; Jung, H. ; Haller, J.
Measurement of the differential cross section of W and Z bosons in the boosted region in proton-proton collisions with the CMS experiment
[DESY-THESIS-2022-013]

Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 201 pp. (2022) [10.3204/PUBDB-2022-03557] = Dissertation, Universität Hamburg, 2021

In this thesis, a measurement of the differential cross section for hadronically decayingW and Z bosons produced in proton-proton collisions is presented. Decay productsof the vector bosons with very high transverse momentum pT are collimated in themomentum direction of the mother particle and are merged into a large cone-size jetwith the characteristic inner structure. [...]

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[PUBDB-2022-01816] Dissertation / PhD Thesis

Linss, A. ; Sander, C. ; Haller, J.
Search for Dark Matter in Invisible Higgs Boson Decays with the ATLAS Detector at the LHC

235 pp. (2022) [10.3204/PUBDB-2022-01816] = Dissertation, University of Hamburg, 2021

The nature of dark matter is one of the biggest open questions in modern physics. While dark matter accountsfor roughly 25% of the energy density in the Universe, its particle nature remains unknown so far. [...]

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[PUBDB-2022-06807] Master Thesis

Lübsen, J. ; Schütte, M. ; Schulz, S. ; et al
Bayesian Optimization for the Control Parameters of the Optical Synchronization System at European XFEL

74 pp. (2022) = Masterarbeit, Hamburg University of Technology, 2022

Linear particle accelerators require outstanding synchronization of the subsystems to provide high quality results for temporally resolved experiments. Considering the laser-based synchronization system at the European X-Ray Free-Electron Laser, this thesis shows the optimization of such large and complex systems whereby safety constraints are fulfilled. [...]

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[PUBDB-2022-04804] Book/Dissertation / PhD Thesis

Maekelae, T. ; Lipka, K. ; Moch, S.-O.
Towards global interpretation of LHC data: SM and EFT couplings from jet and top quark measurements at CMS
[DESY-THESIS-2022-017]

Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 213 pages: Illustrations, figures (2022) [10.3204/PUBDB-2022-04804] = Dissertation, Universität Hamburg, 2022

This thesis presents the first global interpretation of the measurements of doubledifferentialcross sections of inclusive jet and top quark-antiquark pair (tt) productionin proton-proton collisions at the Large Hadron Collider (LHC) at the center ofmass energy of √s = 13TeV, together with inclusive measurements in Deep Inelasticelectron-proton Scattering (DIS) at HERA. The LHC data have been recordedby the Compact Muon Solenoid (CMS) experiment in 2016, and correspond to theintegrated luminosity of 33.5 fb−1 for inclusive jet measurement or 35.9 fb−1 for the ttmeasurement.This novel analysis is performed at next-to-leading order (NLO) of perturbative quantumchromodynamics (QCD), where the inclusive neutral and charged current DISmeasurements at HERA, the CMS jet measurements and the normalized triple-differentialcross sections of tt production are used together to constrain the parametersof QCD and impose constraints on new physics. [...]

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[PUBDB-2023-01714] Dissertation / PhD Thesis

Malerz, S. ; Meijer, G. ; Ruehl, E.
Advances in Liquid-Jet Photoelectron Spectroscopy

270 pp. (2022) [10.17169/refubium-36367] = Dissertation, Freie Universität Berlin, 2022

This doctoral thesis reports on recent developments in photoelectron spectroscopy from the liquid phase, with a prime focus on the electronic structure of liquid water and aqueous solutions. The enabling technique is liquid-jet photoelectron spectroscopy (LJ-PES), which combines state-of-the-art high-pressure-compatible electron analyzers with an in-vacuo liquid microjet [...]

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[PUBDB-2022-01947] Dissertation / PhD Thesis

Marjollet, A. ; Santra, R. ; Rossi, M.
Extension of the ring polymer molecular dynamics approach to state-selective molecular reactive scattering simulations

137 pp. (2022) [10.3204/PUBDB-2022-01947] = Dissertation, University of Hamburg, 2022

The state-resolved knowledge of molecular scattering dynamics is paramount to the understanding and control of chemical reactions. The ideal approach to rigorously simulate such systems is a full-dimensional treatment with quantum mechanicalcalculations. [...]

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[PUBDB-2022-07870] Dissertation / PhD Thesis

Marman, H.
Understanding and Characterising the Effects of Radiation Damage in Protein Micro-Crystallography

La Trobe 14753841 Bytes (2022) [10.26181/20418432.V1] = Dissertation, La Trobe University, 2022

Macromolecular x-ray crystallography (MX) is the premiere technique for determining the structure of proteins, a critical step in the understanding of biological function, including dis-eases and their treatment. Radiation damage is a fundamental limiting factor in protein structure solution via MX [...]

[PUBDB-2022-01378] Master Thesis

Marotzke, S. ; Gruebel, G. ; Rossnagel, K.
Investigation of the magnetic and electronic properties of topological insulator/ferromagnet heterostructures

105 pp. (2022) = Masterarbeit, University of Hamburg, 2021

In recent years, the application of topological principles in physics has paved the way for the discovery of a wide range of topological materials with potential applications in spintronics, zero-resistance materials and quantum computing. Hereby, heterostructures with topological insulators (TIs) as one component and a magnetic material as another play an important role as new topological phases have been predicted in these systems. [...]

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[PUBDB-2022-04628] Bachelor Thesis

Masoudi, S. ; Schäfer, F. H. ; Martens, C. ; et al
Konstruktion einer verkürzten Variante eines Undulators unter Berücksichtigung des Verformungsverhaltens

132 pp. (2022) = Bachelorarbeit, Hochschule für Angewandte Wissenschaften Hamburg, 2022

Diese Bachelorthesis umfasst die Änderungskonstruktion einer verkürzten Variante eines 5m-Undulators unter Berücksichtigung des Magnetträger-Verformungsverhaltens.Die Magnetträger sind symmetrisch, maximal zu kürzen. Alle weiteren Komponenten sollen möglichst unverändert bleiben. [...]

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[PUBDB-2022-08181] Book/Dissertation / PhD Thesis

Mathisen, T. ; Blekman, F. ; Ellajosyula, V. ; et al
Exotic Decays of Vector-Like Quarks and Development of a Test Procedurefor the ITk Strip Module at the ATLAS Detector for the HL-LHC

Acta Universitatis Upsaliensis 181 pp. (2022) = Dissertation, Uppsala University, 2022

The naturalness problem of the Standard Model (SM) challenges our understanding of the origin of mass. Several theories have been proposed to tackle the problem, one of them is the Composite Higgs Model (CHM) where the Higgs boson of the SM is not an elementary scalar but instead a composite object bound at a confinement scale of a TeV. [...]

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[PUBDB-2022-05236] Book/Dissertation / PhD Thesis

Matlis, M. M. ; Ringwald, A. ; Moortgat-Pick, G.
Inflation and Phenomenology in an Extended Two-Higgs-Doublet-Model
[DESY-THESIS-2022-022]

Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 151 pp. (2022) [10.3204/PUBDB-2022-05236] = Dissertation, Universität Hamburg, 2022

The Two-Higgs-Doublet-Standard Model-Axion-Seesaw-Higgs-Portal Inflation (2hdSMASH) model containing two Higgs doublets, a Standard Model (SM) singlet complex scalar and three SM singlet right-handed Majorana neutrinos addresses the following shortcomings of the SM: i) dark matter by axions, ii) strong CP problem by the Peccei-Quinn mechanism, iii) neutrino masses and mixing by the seesaw mechanism, iv) baryon asymmetry by thermal leptogenesis and v) inflation by Higgs portal inflation. In this thesis we investigate the inflationary aspects of 2hdSMASH and its subsequent impact on low energy phenomenology. [...]

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[PUBDB-2022-04972] Book/Dissertation / PhD Thesis

Metwally, J. ; Geiser, A. ; Gallo-Voss, E.
Double differential charm and beauty production cross section measurements at 5 TeV in CMS at the LHC
[DESY-THESIS-2022-019]

Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 226 pp. (2022) [10.3204/PUBDB-2022-04972] = Dissertation, Universität Hamburg, 2022

Double differential cross sections for the production of prompt $D^{*}$ mesons, and $D^{*}$ mesons from b hadron decays (non-prompt) are measured through the decays $D^{*} \rightarrow D^{0} \pi_{s} \rightarrow K \pi \pi_{s}$ and $B \rightarrow D^{*} X \rightarrow D^{0} \pi_{s} X \rightarrow K \pi \pi_{s} X$ in pp collisions in CMS at a center of mass energy of $5\,$TeV in the full phase space complementary to LHCb. The separation of prompt from non-prompt D* mesons near the production threshold is performed in the kinematic range $p_\textrm{T} > 1.5\,$GeV and $|y| < 2$. [...]

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[PUBDB-2023-04694] Dissertation / PhD Thesis

Moder, P. ; Seitz, C. ; Heinemann, B.
Search for Dark Matter in association with a top quark and a $W$-boson in $\sqrt{s}$ = 13 TeV pp collisions at the ATLAS detector

Albert-Ludwigs-Universität Freiburg 210 pp. (2022) [10.6094/UNIFR/233204] = Dissertation, University of Freiburg, 2022

The Standard Model (SM) is the only model in particle physics containing all observed elementary particles and their interactions. Over the years, its predictions were tested and observed in a number of experiments. [...]

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[PUBDB-2022-07627] Book/Dissertation / PhD Thesis

Nigamova, A. ; Gallo-Voss, E. ; Mankel, R.
Measurement of Higgs boson production in association with a vector boson and decay to b-quarks in the Simplified Template Cross Section framework and interpretations with the Standard Model effective field theory
[DESY-THESIS-2022-028]

Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 160 pp. (2022) [10.3204/PUBDB-2022-07627] = Dissertation, Universität Hamburg, 2022

This thesis summarises the cross-section measurement of a Higgs boson de- caying into a bottom quark pair produced in association with a vector boson. The measurement is performed using the CMS data collected during Run 2 with the integrated luminosity of 138 /fb. [...]

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[PUBDB-2023-00576] Dissertation / PhD Thesis

Olea Romacho, M. O. ; Weiglein, G. ; Servant, G.
Higgs physics as a window of the electroweak epoch

241 pp. (2022) [10.3204/PUBDB-2023-00576] = Dissertation, University of Hamburg, 2022

This dissertation investigates three well-motivated scalar extensions of the Standard Model and shows that the combination of constraints from collider experiments, from the evolution of the early Universe, and from future astrophysical experiments, such as GW interferometers, will be very valuable for probing the parameter space of those models.In particular, extensions of the Higgs sector of the Standard Model allow for a rich cosmological history around the electroweak scale. In the two-Higgs-doublet model (2HDM) and its real singlet extension (the N2HDM), we determine the parameter regions featuring a first-order EW phase transition (FOEWPT), but also the regions where other effects occur such as electroweak symmetry non-restoration (SnR) at high temperature. [...]

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[PUBDB-2022-06756] Dissertation / PhD Thesis

Paraskaki, G. ; Hillert, W. ; Zemella, J.
Novel seeding techniques for generation of high repetition rate coherent nanometer FEL radiation

142 pp. (2022) [10.3204/PUBDB-2022-06756] = Dissertation, University of Hamburg, 2022

igh gain free electron lasers (FELs) generate radiation of unprecedented brightness and unique properties and have proven to be a useful tool for applications in a wide range of studies in physics, biology, medicine and chemistry. External seeding techniques have been experimentally demonstrated and aim to improve the intrinsically poor temporal coherence of a high-gain FEL starting from shot noise. [...]

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[PUBDB-2022-07289] Book/Dissertation / PhD Thesis

Petersen, H. ; Behnke, O. ; Gallo-Voss, E.
Measurements of differential cross sections for the production of top quark pairs in pp collisions at $\sqrt{s} = 13$ TeV with the CMS experiment
[DESY-THESIS-2022-025]

Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 362 pp. (2022) [10.3204/PUBDB-2022-07289] = Dissertation, Universität Hamburg, 2022

In this thesis, measurements of differential cross sections of top quark pair ($t\bar{t}$) production in proton-proton (pp) collisions at $\sqrt{s}=13 \text{ TeV}$ are presented. The analysis is based on data obtained with the CMS experiment during 2016, 2017 and 2018 in Run 2 of the LHC, which corresponds to an integrated luminosity of \lumivalueRunii. [...]

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[PUBDB-2022-06900] Book/Dissertation / PhD Thesis

Pietras, Z. ; Langkilde, A. E.
Small angle scattering as a tool to study protein structure and interactions

Linköping : Linköping University Electronic Press, Linköping Studies in Science and Technology. Dissertations 76 pp. (2022) [10.3204/PUBDB-2022-06900] = Dissertation, Linköping University, 2022

This thesis uses small angle X-ray and neutron scattering (SAXS/SANS) to gain structural and functional insight into the molecular regulation of critical life processes in prokaryotic and eukaryotic species. The presented studies highlight the strength of combining low-resolution structure determination with biophysical and in silico modelling methods to extensively characterize proteins and their interactions..

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[PUBDB-2022-06474] Dissertation / PhD Thesis

Pinto, O. L. ; Garutti, E. ; Krüger, K.
Shower Shapes in a Highly Granular SiPM-on-Tile Analog Hadron Calorimeter

250 pp. (2022) [10.3204/PUBDB-2022-06474] = Dissertation, University of Hamburg, 2022

This thesis concerns the development of a hadron calorimeter for future $e^+ e^−$ collider experiments such as ILC. The detectors at the ILC are optimized for the particle-flow approach, which aims to reach a jet energy resolution of 3-4% by measuring each particle in a jet using the best sub-detector measurement. [...]

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[PUBDB-2023-00327] Dissertation / PhD Thesis

Plaisier, I. ; Nelles, A. F.
Reconstructing the Arrival Direction of Cosmic Neutrinos with the Radio Neutrino Observatory Greenland (RNO-G)

125 pp. (2022) [10.3204/PUBDB-2023-00327] = Dissertation, Friedrich-Alexander-Universität Erlangen-Nürnberg, 2022

Neutrinos in the ultra-high energy regime are expected, either from astrophysical or cosmogenic origin. Due to the steeply falling neutrino flux for high energies, the currently largest neutrino detector has only observed neutrinos up to PeV energies [...]

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[PUBDB-2022-04919] Dissertation / PhD Thesis

Praz, C. ; Glazov, A. ; Tackmann, K.
Search for B→K𝑣𝑣 decays with a machine learning method at the Belle II experiment

Hamburg 1-165 (2022) [10.3204/PUBDB-2022-04919] = Dissertation, University of Hamburg, 2022

This thesis documents a search for the rare decay of a B meson into a K meson and a pair of neutrinos at the Belle II experiment, which is located along the SuperKEKB energy-asymmetric electron-positron collider. This decay has never been observed, its branching fraction is predicted with accuracy in the standard model of particle physics, and is a good probe of physics beyond the standard model. [...]

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[PUBDB-2022-02584] Dissertation / PhD Thesis

Quintavalle, L. ; Schomerus, V.
Multipoint Conformal Blocks in Conformal Field Theories

145 pp. (2022) [10.3204/PUBDB-2022-02584] = Dissertation, University of Hamburg, 2022

A very powerful tool in Conformal Field Theories is the conformal block expansion, which plays a crucial role in the conformal bootstrap programme. The goal of this thesis is to improve the understanding and mathematical control over conformal block expansions for more than four external fields, studying the so-called multipoint conformal blocks from the perspective of the differential equations these satisfy. [...]

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[PUBDB-2022-02800] Book/Dissertation / PhD Thesis

Rauer, P. ; Rossbach, J. ; Decking, W. ; et al
A Proof-Of-Principle Cavity-Based X-Ray Free-Electron-Laser Demonstrator at the European XFEL
[DESY-THESIS-2022-010]

Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 279 pp. (2022) [10.3204/PUBDB-2022-02800] = Dissertation, Universität of Hamburg, 2022

This thesis is centered on the foreseen realization and performance of a proof-of-principle cavity based (hard) X-ray FEL (CBXFEL) demonstrator experiment at the European XFEL facility. A CBXFEL promises to address the prominent issue of longitudinal coherence and (stable) high, narrow bandwidth spectral flux in the hard X-ray regime, in which the usually employed self amplified spontaneous emission (SASE) scheme is severely lacking.In order to study the highly coupled system of FEL production, X-ray propagation and the crystals’ thermal response, affecting the reflection characteristics, a computational frame-work was set up. [...]

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[PUBDB-2025-00528] Master Thesis

Reichenbach, L. ; List, J. ; Garutti, E.
Identification of Charged Leptons in Jets at Future Higgs Factories

Hamburg 131 pp. (2022) = Masterarbeit, University of Hamburg, 2022

The 2012 discovery of the 12 GeV Higgs boson at the LHC, and of no other particle since then, have brought a consensus to the particle physics community that an e+e- Higgs factory is the highest priority next collider. However, Higgs measurements suffer from the loss of undetected neutrino energy due to semi-leptonic decays (SLDs) in the most common decay mode H to b anti-b. [...]

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[PUBDB-2022-01931] Book/Dissertation / PhD Thesis

Renardi, A. ; Cornell, S. D. ; Kroeninger, K.
The silicon strip detector of the ATLAS Inner Tracker: from individual sensing units to multi-module petal structures
[DESY-THESIS-2022-008]

Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 153 pp. (2022) [10.3204/PUBDB-2022-01931] = Dissertation, University of Dortmund, 2022

Nowadays particle detector technology is taking big steps forwards and new devices dedicated to particle physics show very high performance. Particularly the semi-conductor detectors have advanced significantly and are used for tracking purposes in the A Toroidal LHC ApparatuS (ATLAS) experiment at CERN thanks to their excellent spacial resolution: the compact size of the silicon and its high granularity allow to reach a precision measurement of few tens of microns.This thesis is focused on the upgrade of the ATLAS tracking detector required for the High Luminosity Large Hadron Collider (HL-LHC), starting in 2027. [...]

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[PUBDB-2022-03160] Book/Dissertation / PhD Thesis

Reukauff, M. ; Hoffmann, M. ; Jacob, A.
A low-noise front-end for an X-band particle deflector at DESY
[DESY-THESIS-2022-011]

Hamburg : Verlag Deutsches Elektronen-Sychrotron DESY, DESY-THESIS 110 pp. (2022) [10.3204/PUBDB-2022-03160] = Dissertation, Technische Universität Hamburg, 2022

In this thesis, a low-level RF (LLRF) system for the novel polarizable transverse deflecting structure PolariX TDS is developed, installed, and commissioned at the FLASHForward beamline at DESY. The PolariX TDS operates in the X-band at 12 GHz and requires an LLRF system capable of measuring and processing signals in this frequency band. [...]

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[PUBDB-2022-07281] Dissertation / PhD Thesis

Righi, N. ; Westphal, A.
On the Cosmology of String Axions

155 pp. (2022) [10.3204/PUBDB-2022-07281] = Dissertation, University of Hamburg, 2022

In this thesis, we discuss various aspects of the phenomenology of axion fields originating from the compactification of type IIB superstring theory. First, we give an overview of moduli stabilisation and string axions. [...]

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Rivadeneira Bracho, P. A. ; Peters, K. ; Gallo-Voss, E.
Search for invisible decays of the Higgs bosonproduced via vector boson fusion at the ATLAS detector with 139 fb$^{−1}$ of integrated luminosity

[PUBDB-2022-06536] Dissertation / PhD Thesis

175 pp. (2022) [10.3204/PUBDB-2022-06536] = Dissertation, University of Hamburg, 2022

Dark Matter composes a significant part of the Universe. Despite the experimental evidence, its fundamental nature is still an open question. [...]

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[PUBDB-2025-00232] Dissertation / PhD Thesis

Rudolph, A. ; Winter, W. ; Berge, D. ; et al
Emission of Multiple Messengers from Gamma-Ray Bursts

Berlin : Humboldt-Universität zu Berlin 171 pp. (2022) [10.3204/PUBDB-2025-00232] = Dissertation, Humboldt University Berlin, 2022

Gamma-Ray Bursts (GRBs) are among the most energetic transients in the Universe and candidate sources of Ultra-High-Energy Cosmic Rays (UHECRs). A clear confirmation from UHECR measurements is however challenging, as the directional information of cosmic rays is partially lost due to deflection by (inter-)galactic magnetic fields. [...]

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[PUBDB-2023-00282] Master Thesis

Ruiz Daza, S. ; Gregor, I.-M. ; Dingfelder, J.
Monte Carlo Simulations of DetectorPrototypes Designed in a 65 nm CMOSImaging Process

91 pp. (2022) [10.3204/PUBDB-2023-00282] = Masterarbeit, Rheinischen Friedrich-Wilhelms-Universität, 2022

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[PUBDB-2022-04411] Book/Dissertation / PhD Thesis

Saragnese, M. ; Blümlein, J. ; Moch, S.-O.
Massive 2- and 3-loop corrections to hard scattering processes in QCD
[DESY-THESIS-2022-016]

Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 258 pp. (2022) [10.3204/PUBDB-2022-04411] = Dissertation, Universität Hamburg, 2022

This thesis deals with calculations of higher-order corrections in perturbative quantum chromodynamics(QCD). The two-mass contributions to the 3-loop, polarized twist-two operator matrixelements (OMEs) A(3),PSQq and A(3)gg,Q are calculated. [...]

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[PUBDB-2022-01760] Dissertation / PhD Thesis

Schaefer, J.
Molecular modeling at high X-ray intensity: Developments, applications and challenges

1-130 (2022) = Dissertation, Universität Hamburg, 2021

The advent of X-ray free-electron lasers (XFELs) over the past decade, providing ultraintense femtosecond X-ray pulses, offers novel opportunities formolecular structure investigations. By now, most of the established approachesrevolve around diffractive imaging schemes with crystalline samples, whereelectronic and nuclear radiation damage, caused by the X-rays, must be avoidedto achieve the highest possible spatial resolution. [...]

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[PUBDB-2022-03978] Dissertation / PhD Thesis

Schmeiser, F.
In situ X-ray diffraction during laser powder bed fusion

Technische Universität Berlin 114 pp. (2022) [10.14279/DEPOSITONCE-15804] = Dissertation, Technische Universität Berlin, 2022

The Laser Powder Bed Fusion (LPBF) process is a generative manufacturing process, where a focused laser beam selectively melts a thin layer of powder. The three-dimensional component is created layer by layer by repeating the application of a new powder layer followed by laser exposure. [...]

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[PUBDB-2022-07442] Dissertation / PhD Thesis

Schneider, M. ; Patella, A. ; Jansen, K. ; et al
The Hubbard model on a honeycomb lattice with fermionic tensor networks

Berlin : Humboldt-Universität zu Berlin 172 pp. (2022) [10.3204/PUBDB-2022-07442] = Dissertation, Humboldt-Universität zu Berlin, 2022

Using tensor network (TN) techniques, we study the Hubbard model on a honeycomb lattice with a chemical potential, which models the electron structure of graphene. In contrast to Monte Carlo methods, TN algorithms do not suffer from the sign problem when a non-zero chemical potential is present. [...]

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[PUBDB-2022-01419] Dissertation / PhD Thesis

Schuster, R. ; Libuda, J. ; Stierle, A.
Model Studies of Catalytic Processes at the Solid/Liquid Interface

Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) 170 pp. (2022) = Dissertation, Friedrich-Alexander-University Erlangen-Nuremberg, 2021

This thesis focuses on the fundamental understanding of different catalytic reactions at the interface between a solid catalyst and a liquid reactant phase. To this end, both in situ and operando experiments, monitored by synchrotron X-ray diffraction techniques as well as infrared spectroscopy based surface science model studies, were performed. [...]

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[PUBDB-2022-06758] Dissertation / PhD Thesis

Schwickert, D. ; Laarmann, T. ; Drescher, M.
Quantum coherences in glycine probed with femtosecond x-rays

105 pp. (2022) [10.3204/PUBDB-2022-06758] = Dissertation, University of Hamburg, 2022

Intramolecular charge migration plays a key role in photochemical reactions of biorelevant molecules. This work combines ultrashort free-electron laser soft x-ray pulses with a kinematically complete pump-probe absorption measurement in order to monitor electronic and nuclear wave packet dynamics. [...]

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[PUBDB-2022-02914] Dissertation / PhD Thesis

Shearer, C. ; Kaiser, R.
Spin density matrix element extraction for the $\rho^0$ vector meson on hydrogen and deuterium targets at HERMES
[DESY-HERMES-05-33]

University of Glasgow 214 pp. (2022) [10.5525/gla.thesis.82839] = Dissertation, University of Glasgow, 2022

The HERMES experiment in Hamburg, Germany, consists of a large forward spectrometer which studies various physics processes related to the nucleon and its internal structure. The main focus of the analysis presented in this thesis is based on the angular decay distributions of the decay products of the ρ0 vector meson. [...]

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[PUBDB-2022-06377] Dissertation / PhD Thesis

Siebenaller, C.
Principles guiding IM30-mediated membrane remodeling

Johannes Gutenberg-Universität Mainz 287 pp. (2022) [10.25358/OPENSCIENCE-6677] = Dissertation, Johannes Gutenberg-Universität Mainz, 2022

The inner membrane-associated protein of 30 kDa (IM30) is critically involved in the biogenesis anddynamics of thylakoid membranes (TMs). However, its exact physiological function is unclear so far.IM30 appears to be involved in both the stabilization as well as the continuous reorganization of theTM network. [...]

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[PUBDB-2022-04355] Dissertation / PhD Thesis

Sokolov, A. ; Ringwald, A. ; Sigl, G.
Electric-magnetic duality invariance implications for axion physics

130 pp. (2022) [10.3204/PUBDB-2022-04355] = Dissertation, University of Hamburg, 2022

Axions and axion-like particles are very well-motivated candidates for physics beyond the Standard model, which can be probed by multiple existing and projected experiments and astrophysical observations. Theoretical determination of the relevant low energy axion interactions is essential for guiding the corresponding experimental and observational efforts. [...]

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[PUBDB-2024-00872] Dissertation / PhD Thesis

Stein, R. ; Franckowiak, A. ; Winter, W. ; et al
Search for Multi-Messenger Transients with IceCube and ZTF

Humboldt-Universität zu Berlin 177 pp. (2022) [10.18452/25305] = Dissertation, HU Berlin, 2021

Das IceCube Neutrino Observatory, das größte Neutrino-Observatorium der Welt, entdeckte 2013 erstmals einen Fluss hochenergetischer Neutrinos. Diese Neutrinos müssen von astrophysikalischen Beschleunigern erzeugt werden, aber ihr genauer Ursprung ist bisher unbekannt. [...]

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[PUBDB-2022-07425] Book/Dissertation / PhD Thesis

Stienemeier, P. ; Reuter, J. ; Moortgat-Pick, G.
Automation and Application of fixed-order and matched NLO Simulations
[DESY-THESIS-2022-027]

Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 180 pp. (2022) [10.3204/PUBDB-2022-07425] = Dissertation, Universität Hamburg, 2022

Run 3 of the Large Hadron Collider (LHC) has recently begun and heralds an era of unprecedented experimental precision. At the same time, several potential successors, future hadron- but also lepton colliders, advance in design and scheduling. [...]

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[PUBDB-2022-06892] Book/Dissertation / PhD Thesis

Sytcevich, I. ; Heyl, C. ; Arnold, C. ; et al
Generation, characterization and application of infrared few-cycle light pulses

162 pp. (2022) [10.3204/PUBDB-2022-06892] = Dissertation, Lund University, 2022

In recent decades, laser systems emitting pulses of light containing only a few electric field oscillations under their envelope have become common in many ultrafast optics laboratories. Owing to unique temporal characteristics and achieving extreme field strengths, these so-called few-cycle pulses have been instrumental in unlocking new regimes of light-matter interaction.The work presented in this thesis is focused on mastering the techniques to generate and characterize few-optical-cycle light pulses in the near and short-wave infrared spectral regions. [...]

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[PUBDB-2024-07874] Master Thesis

Tayade, A. ; Behr, K. ; Styles, N. ; et al
Tracking in Dense Environments for theATLAS ITk Strip Detector

77 pp. (2022) = Masterarbeit, University of Bonn, 2022

The Phase II upgrade of the ATLAS detector will prepare it to handle the 2.5–fold increase in instantaneous luminosity of the High Luminosity LHC project starting in 2028. The upgrade will also involve the tracking sub-system of the ATLAS detector to be replaced by the Inner Tracker (ITk), which is made up of a closer-to-beam-line Pixel and acircumscribing Strip detector. [...]

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[PUBDB-2023-00581] Master Thesis

Tayade, A. ; Gregor, I.-M.
Tracking in Dense Environments for theATLAS ITk Strip Detector

77 pp. (2022) = Masterarbeit, Rheinische Friedrich-Wilhelms-Universität Bonn, 2022

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[PUBDB-2022-06797] Dissertation / PhD Thesis

Thompson, E. ; Heinemann, B. ; Meloni, F.
Search for long-lived Supersymmetric particles using displaced vertices with the ATLAS detector at the LHC

165 pp. (2022) = Dissertation, Albert-Ludwigs-Universität Freiburg, 2022

The existence of long-lived particles (LLPs) is a common feature in many theories beyond the Standard Model. For example, models with small couplings (i.e. [...]

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[PUBDB-2023-00002] Dissertation / PhD Thesis

Tietz, C. ; Sepiol, B.
Diffusion in ionic glasses studied with coherent X-rays

Wien 103 pp. (2022) = Dissertation, University of Vienna, 2022

Most scientific research on the topic of atomic diffusion in glasses is either based on theoretical work or computer simulations. Few experimental data are available due to the methods being either macroscopic, like tracer diffusion measurements, or probe time-scales too fast to study atomic transport in solids. [...]

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[PUBDB-2022-01695] Book/Dissertation / PhD Thesis

Tober, S. ; Stierle, A.
Near-surface Iron Cation Transport in Magnetite
[DESY-THESIS-2022-007]

Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 230 pp. (2022) [10.3204/PUBDB-2022-01695] = Dissertation, Universität Hamburg, 2021

Magnetite ($\text{Fe}_3\text{O}_4$), one of the first known magnetic materials, has multiple applications as for example as a catalyst or catalyst component. Magnetite nanoparticles are used as contrast agents in medicine or building blocks in novel hierarchical materials with outstanding mechanical properties. [...]

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[PUBDB-2022-07578] Dissertation / PhD Thesis

Trunk, M. ; Maier, A.
Design, Construction and Commissioning of a Cryogenic Undulator for Laser-Plasma Based Free Electron Lasing at Lux

242 pp. (2022) [10.3204/PUBDB-2022-07578] = Dissertation, University of Hamburg, 2022

In this thesis, the design and commissioning of the cryogenic in-vacuum undulatorFrosty is presented, which will be used to demonstrate a possible free electron lasingwith a laser plasma accelerated beam at the Lux facility. The design of Lux follows adecompression scheme to reduce the effective energy spread in the FEL, which requires atunable and taperable gap up to 5 %/m. [...]

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[PUBDB-2022-01774] Dissertation / PhD Thesis

Van Cauwenbergh, P. ; Boenisch, M.
Tailoring Heat Treatments for Metals Processed by Laser Powder Bed Fusion

171-200 (2022) [10.3204/PUBDB-2022-01774] = Dissertation, KU Leuven, 2022

The project's main goal is to design tailored post-process heat treatments for four LPBF high-end alloys (AlSi10Mg, AlSi7Mg, Ti6Al4V ELI, Inconel 718) that are widely used in the Aerospace, Healthcare, and Energy industry. The precondition for a successful design of the tailored heat treatment is the guarantee that mechanical property standards for the Aerospace, Healthcare, and Energy industry are met at any time. [...]

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[PUBDB-2022-03838] Dissertation / PhD Thesis

Van Thurenhout, S. ; Moch, S.-O. ; Kniehl, B.
Anomalous dimensions of composite operators for off-forward hard scattering processes

150 pp. (2022) [10.3204/PUBDB-2022-03838] = Dissertation, University of Hamburg, 2022

We consider the renormalization of operator matrix elements for exclusive hard scattering processes in the chiral limit in the $\overline{\text{MS}}$-scheme. For such processes, mixing with total derivative operators has to be taken into account. [...]

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[PUBDB-2022-04798] Book/Dissertation / PhD Thesis

Walter, D. ; Jafari, A. ; Gallo-Voss, E.
First differential measurements of tZq production and luminosity determination using Z boson rates at the LHC
[DESY-THESIS-2022-018]

Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 210 pp. (2022) [10.3204/PUBDB-2022-04798] = Dissertation, Universität Hamburg, 2022

In this thesis, measurements are presented using proton-proton collision data at $\sqrt{s}$ =13 TeV collected by the CMS experiment in the years 2016, 2017, and 2018, corresponding to an integrated luminosity of 138 fb$^{−1}$. New results on single top quark production in association with a Z boson $(tZq)$ are presented. [...]

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[PUBDB-2022-01592] Dissertation / PhD Thesis

Wasicki, C. ; Moenig, K. ; Lacker, H. ; et al
Search for top quark-antiquark pair resonances with the ATLAS experiment

211 pp. (2022) = Dissertation, Humboldt-Universität zu Berlin, 2021

AbstractA search for new heavy particles that decay into top quark-antiquark pairs ispresented using an integrated luminosity of 20.3 fb$^{−1}$ of proton-proton collision datarecorded at a centre-of-mass energy of √s = 8 TeV with the ATLAS experiment atthe Large Hadron Collider. The analysis considers events with exactly one chargedlepton, missing transverse momentum and jets in the final state. [...]

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[PUBDB-2023-00329] Dissertation / PhD Thesis

Welling, C. ; Nelles, A. F.
Energy Reconstruction for Radio Neutrino Detectors

136 pp. (2022) [10.3204/PUBDB-2023-00329] = Dissertation, Friedrich-Alexander-Universität Erlangen-Nürnberg, 2022

Currently, the technique to detect neutrinos at the EeV energy scale by the radio signals emitted when they interact in glacial ice, is making the transition from smallprototype experiments to full discovery-scale detectors. In the summer of 2021, construction started for the Radio Neutrino Observatory Greenland (RNO-G), the firstdetector large enough to be sensitive to the expected flux of cosmogenic neutrinos. [...]

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[PUBDB-2022-06794] Dissertation / PhD Thesis

Wongel, A. ; Peters, K. ; Schleper, P.
Search for Heavy Resonances in Four-Top-Quark Final States in $pp$ Collisionsat $\sqrt{s}$ = 13 TeV With the ATLAS Detector

164 pp. (2022) [10.3204/PUBDB-2022-06794] = Dissertation, University of Hamburg, 2022

A search for heavy resonances with a mass of 1 TeV or more in four-top-quark events is presented.This search uses proton-proton-collision data collected with the ATLAS detector at the Large HadronCollider (LHC) during Run 2 in the years 2015-2018 at a center-of-mass energy of √𝑠 = 13 TeV. Therare four-top-quark final state can be investigated for the first time with this data set corresponding toan integrated luminosity of 139 fb−1. [...]

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[PUBDB-2023-00300] Dissertation / PhD Thesis

Yang, G. ; Küpper, J. ; Yachmenev, A.
Theoretical and experimental investigation of nuclear spin dynamics in water and ammonia

Hamburg 103 pp. (2022) [10.3204/PUBDB-2023-00300] = Dissertation, University of Hamburg, 2022

Water and ammonia have two nuclear spin isomers <i>para</i> and <i>ortho</i> that differ by the total nuclear spin of the pair of identical hydrogen nuclei. They are essential molecules for life, which play important roles in many aspects such as chemistry, biology, medicine, and astrophysics. [...]

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