DISSERTATIONEN - MASTERARBEITEN - BACHELORARBEITEN 2020



OpenAccess [PUBDB-2020-02797] Book/Dissertation / PhD Thesis
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Untersuchung der Photoelektronen-Winkelverteilungen von ausgerichteten Molekülen in der Gasphase
[DESY-THESIS-2020-018]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 206 pp. () [10.3204/PUBDB-2020-02797] = Dissertation, Universität Hamburg, 2020  GO
This work investigates if and how photoelectron diffraction might become a suitable tool to measure structural changes of small molecules in the gas-phase with femtosecond temporal and angstrom spatial resolution. Molecular-frame photoelectron angular distributions (MFPAD) of O(1$s$)-, S(2$p$)- and F(1$s$)-electrons from carbonyl sulfide and fluoromethane molecules have been measured in photoelectron-photoion coincidence experiments at the synchrotron radiation sources DORIS and PETRA III (kinetic energy of photoelectrons: 16 eV < E$_{\mathrm{PE}}$ < 283 eV). [...]
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OpenAccess [PUBDB-2020-04835] Dissertation / PhD Thesis
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High-resolution broadband rotational spectroscopy and electrical discharge experiments of astrochemically relevant molecules.
241 pp. () [10.3204/PUBDB-2020-04835] = Dissertation, University of Hamburg, 2020  GO
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OpenAccess [PUBDB-2020-03891] Book/Dissertation / PhD Thesis
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Detection and Identification of Electrons and Photons - Applications in the ATLAS Experiment, for the ATLAS ITk Detector and at the DESY II Test Beam
[DESY-THESIS-2020-022]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 395 pp. () [10.3204/PUBDB-2020-03891] = Dissertation, Technical University of Dortmund, 2020  GO
It is important to exploit particle detectors for the detection and identification of electrons and photons in the best possible way, as it is adressed in this thesis by discussing three different application examples of precisely measuring electrons and photons at high-energy physics andtest beam experiments.Firstly, the optimization of the photon identification within the ATLAS detector at the LHCis investigated. Appropriate selection criteria are needed to efficiently discriminate prompt photons steming from the hard-scattering collision process from photons originating from hadronic jet decays. [...]
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[PUBDB-2020-02185] Master Thesis

Design of a driver circuit for Mach-Zehnder modulators with data rates up to 20 Gbps implemented in a 90 nm SOI CMOS process
90 pp. () = Masterarbeit, TU Hamburg-Harburg, 2020
OpenAccess [PUBDB-2020-03401] Dissertation / PhD Thesis

Načrtovanje de novo proteinskega konformacijskega stikala na osnovi motiva ovite vijačnice
1-121 () = Dissertation, University of Ljubljana, 2020
De novo protein design represents an exciting opportunity to explore the conformational space unsampled by nature and develop novel protein folds and functionality. One of the current challenges in the protein design field is the design of proteins that change their conformation in response to environmental cues [...]
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[PUBDB-2020-04413] Bachelor Thesis
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Degradation of perovskite solar cells by X-rays
1-24 () = Bachelorarbeit, Universität Hamburg, 2020
Perovskite solar cells are a promising photovoltaic technology with their low production costsand high efficiencies. The main reason the technology is not ready for the market yet is the instability of the perovskite absorber and its fast degradation. [...]
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OpenAccess [PUBDB-2020-00563] Dissertation / PhD Thesis
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Investigations on the Capabilities of THz Production at the PITZ Facility
145 pp. () [10.3204/PUBDB-2020-00563] = Dissertation, Universität Hamburg, 2020  GO
The European XFEL has planned to perform pump-probe experiments by using its x-ray pulses and THz pulses. A promising concept to provide the THz pulses is to generate them using a tunable high-power accelerator-based THz source. [...]
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OpenAccess [PUBDB-2020-04239] Master Thesis
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Longitudinal Bunch Profile Diagnostics at a Laser-Driven Plasma Wakefield Acceleration Experiment
83 pp. () [10.3204/PUBDB-2020-04239] = Masterarbeit, University of Hamburg, 2020  GO
Plasma wakefield acceleration is a promising technique for the production and/oracceleration of high energy charged particle beams on a centimeter-scale. In suchexperiments, a strong and compact focusing of divergent electron beams can berealized with an active plasma lens. [...]
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OpenAccess [PUBDB-2020-04693] Dissertation / PhD Thesis
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Measurement and Interpretation of Higgs Boson Differential Cross Sections in the Diphoton Decay Channel and Measurement of the Photon Identification Efficiency in the ATLAS Experiment
271 pp. () [10.3204/PUBDB-2020-04693] = Dissertation, University of Hamburg, 2020  GO
he properties of the scalar boson that was first found in 2012 by the ATLAS and CMS experiments at the LHC are so far consistent with those of the Higgs boson, predicted by the Standard Model of particle physics. Further investigations of the boson's properties with increased accuracy are of immediate interest, as any deviation from Standard Model predictions could lead the way to a more fundamental theory of nature. [...]
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OpenAccess [PUBDB-2020-02483] Dissertation / PhD Thesis
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Novel ultrafast fiber laser sources utilizing fiber nonlinearities
19-128 () [10.3204/PUBDB-2020-02483] = Dissertation, Universität Hamburg, 2020  GO
Due to the lack of proper active gain media, mid-IR frequency combs in the molecular “fingerprint” region are normally implemented by difference frequency generation (DFG) process inside nonlinear crystals. In addition to granting an access to the long-wave (>10 μm) side of the mid-IR spectrum, DFG also offers a wide wavelength tunability, a high-repetition-rate (HRR) operation (>10 MHz), and a passive cancelation of the carrier-envelope phase offset, all of which enable a simplified experimental configuration for constructing mid-IR frequency combs.Currently, DFG-based mid-IR frequency combs especially at wavelengths beyond 10 μm suffer from insufficient available power, mainly caused by un-optimized wavelength-shifting processes and an inefficient parametric interaction of the DFG process. [...]
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OpenAccess [PUBDB-2020-01501] Book/Report/Dissertation / PhD Thesis
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Integrability in N = 1 Gauge Theories
[DESY-THESIS-2020-005]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 139 pp. () [10.3204/PUBDB-2020-01501] = Dissertation, Universität Hamburg, 2020  GO
In this thesis we investigate two questions that shed new light on fundamentalproperties of supersymmetric gauge theories.Our first topic deals with the question, which implications results for N = 4 Super-Yang-Mills have on theories with less symmetry. Specifically we conjecture that thedilatation operator in the SU(2, 1|1) sector of any N = 1 superconformal gauge theorycan be found from the one for N = 4 Super-Yang-Mills by a redefinition of the couplingconstant. [...]
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OpenAccess [PUBDB-2020-03978] Bachelor Thesis
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Precision metrology measurements for the CMS phase-2 Tracker upgrade
57 pp. () [10.3204/PUBDB-2020-03978] = Bachelorarbeit, University of Hamburg, 2020  GO
The LHC, along with all of its experiments, is going through an upgrade. The currentLHC, designed for an integrated luminosity of 300 fb$^{-1}$ , will be upgraded to the HighLuminosity LHC (HL-LHC), providing an increased collision rate and will deliver morethan 3000 fb$^{-1}$ luminosity [...]
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OpenAccess [PUBDB-2020-04784] Master Thesis
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Search for $\it tZq$ in dilepton final states with Machine Learning techniques
55 pp. () [10.3204/PUBDB-2020-04784] = Masterarbeit, Universit`a degli Studi di Milano - Bicocca, 2020  GO
In this work, events in which a single top quark is produced in association with a Z-boson are investigated. Particular focus is on final states in which two leptons originate from the Z boson and the top quark decays hadronically. [...]
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OpenAccess [PUBDB-2020-04343] Book/Dissertation / PhD Thesis
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Search for light bosons in the final state with muons and tau leptons with CMS Run II data
[DESY-THESIS-2020-026]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 215 pp. () [10.3204/PUBDB-2020-04343] = Dissertation, Universität Hamburg, 2020  GO
A search for a pair of light bosons produced in decays of the 125 GeV Higgs boson, with one of the light states decaying into a pair of muons and the other into a pair of tau leptons, is presented. The search is based on a data sample corresponding to an integrated luminosity of 137.2 fb-1, collected with the CMS detector at the CERN Large Hadron Collider in the years 2016, 2017, and 2018 at a center-of-mass energy of 13 TeV. [...]
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OpenAccess [PUBDB-2021-00192] Dissertation / PhD Thesis
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Exciton Dynamics in Molecular Heterojunctions
87 pp. () [10.3204/PUBDB-2021-00192] = Dissertation, Universita degli Studi di Trieste, 2020  GO
In recent years, the need for a more sustainable economic development contributed to the increasing interest in renewable energy sources. With encouraging trends on power conversion efficiencies and manufacturing costs, photovoltaics is expected to be the workhorse for the production of green energy in the future. [...]
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OpenAccess [PUBDB-2020-02286] Book/Dissertation / PhD Thesis
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Adsorption of Carboxylic Acids on Magnetite Single Crystal Surfaces
[DESY-THESIS-2020-011]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 160 pp. () [10.3204/PUBDB-2020-02286] = Dissertation, Universität Hamburg, 2020  GO
Magnetite is a versatile transition metal oxide with applications in catalysis, biomedical imaging and spintronic devices. Moreover, magnetite nanoparticles covered with oleic acid are formed into novel nanocomposite, hierarchical materials with outstanding mechanical properties in terms of strength and hardness. [...]
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OpenAccess [PUBDB-2020-02305] Book/Dissertation / PhD Thesis
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Niobium Near Surface Composition Relevant for Superconducting Radio-Frequency Cavities
[DESY-THESIS-2020-013]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 180 pp. () [10.3204/PUBDB-2020-02305] = Dissertation, Universität Hamburg, 2020  GO
A detailed study of the near-surface composition and structure of Nb, the current state-of-the-art material for superconducting radio-frequency accelerator (SRF) cavities, is of extreme importance in order to understand the consequences of different treatments applied during their production as well as its effects in conditions resembling real operation. Recently, different thermal treatments involving the presence of nitrogen achieved remarkable performance increases of such devices, however, the physical and chemical phenomena involved are still elusive. [...]
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OpenAccess [PUBDB-2020-02374] Dissertation / PhD Thesis
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The measurement of W± boson charge asymmetry at $\sqrt{s}$ = 13 TeV with the CMS detector using the 2015 data set and a global QCD analysis on this asymmetry
202 pp. () [10.3204/PUBDB-2020-02374] = Dissertation, University of Hamburg, 2020  GO
This thesis presents physics results accomplished during the 2017-2019 years in the CMS experiment. Three main contributions are discussed: a measurement of diamond sensors for the BCM1F luminometer and monitoring of its performance during the whole Run 2; a measurement of differential cross-sections of W± boson production in the muon channel as a function of pseudorapidity at $\sqrt{s}$ = 13 TeV using 2015 data set, and extraction of W± boson charge asymmetry values; a global QCD analysis with the obtained asymmetry results. [...]
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OpenAccess [PUBDB-2020-02655] Book/Dissertation / PhD Thesis
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First measurement of the running of the top quark mass
[DESY-THESIS-2020-016]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 189 pp. () [10.3204/PUBDB-2020-02655] = Dissertation, Universität Hamburg, 2020  GO
In this thesis, the rst experimental determination of the running of the top quarkmass is presented. The running is extracted from a measurement of the dierentialtop quark-antiquark (tt) production cross section as a function of the invariant massof the tt system, mtt. [...]
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OpenAccess [PUBDB-2020-04474] Dissertation / PhD Thesis
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INVESTIGATION ON SOME ANTIFERROELECTRIC LIQUID CRYSTALS AND THEIR MIXTURES
222 pp. () [10.3204/PUBDB-2020-04474] = Dissertation, University of North Bengal, 2020  GO
Liquid crystals are fascinating self–assembled soft materials in which the molecules are orientationally ordered and partially positionally ordered. Liquid crystals easily response to small perturbations like the electric field, magnetic field, surface effect, etc. [...]
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OpenAccess [PUBDB-2021-03004] Dissertation / PhD Thesis

Time-resolved imaging of laser-induced phase transitions in free silver nanoclusters
Universität Freiburg : Albert-Ludwigs-Universität Freiburg 137 pp. () [10.6094/UNIFR/175263] = Dissertation, Albert-Ludwigs-Universität Freiburg im Breisgau, 2020  GO
In this work, the challenge to further the fundamental understanding of nanoscale matter is tackled from the perspective of cluster science. More specifically the spatial transformation of gas phase silver nanoclusters during melting is investigated. [...]
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OpenAccess [PUBDB-2020-02131] Book/Dissertation / PhD Thesis
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Cross Section measurements of $t\bar{t}$ pair production in the boosted regime in proton-proton collisions at $\sqrt{s}=13$ TeV with the CMS experiment at the Large Hadron Collider
[DESY-THESIS-2020-006]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 274 pp. () [10.3204/PUBDB-2020-02131] = Dissertation, Universität Hamburg, 2019  GO
In this thesis measurements of the $t\bar{t}$ pair production at the very high transverse momentum are presented. When a top quark is produced with very high momentum the decay products are collimated in the direction of the quark, and they can be clustered within a single large cone size jet. [...]
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Embargoed OpenAccess [PUBDB-2020-05063] Master Thesis
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Paving the way of high repetition rate laser wakefield acceleration by solving heat induced grating deformation issues
62 pp. () [10.3204/PUBDB-2020-05063] = Masterarbeit, University of Hamburg, 2020  GO
The goal of this thesis was to enable high repetition rate Laser Wakefield Acceleration(LWFA) by solving heat induced grating deformation issues in a Chirped PulseAmplification (CPA) based 25 TW Ti:sapphire laser system centred at 800 nm. Thesepreviously limited the intensity and wavefront quality of the pulse. [...]
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[PUBDB-2021-01468] Master Thesis
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Development of a standard test and calibration procedure for the hardware of the Radio Neutrino Detector RNO-G
135 pp. () = Masterarbeit, University of Erlangen, 2020
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OpenAccess [PUBDB-2020-04106] Book/Dissertation / PhD Thesis
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Novel Concepts and Theoretical Studies for High-Quality Plasma-Based Accelerators
[DESY-THESIS-2020-023]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 233 pp. () [10.3204/PUBDB-2020-04106] = Dissertation, Universität Hamburg, 2020  GO
In this work, new concepts for solving some of the current challenges of plasma-based acceleration are proposed and explored. These concepts, which rely on a combination of plasma-acceleration stages with a magnetic chicane, show that GeV-range beams with sub-percent energy stability and an unprecedented sub-per-mille energy spread could be produced. [...]
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OpenAccess [PUBDB-2020-04727] Dissertation / PhD Thesis
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Search for axion-like particles through their effects on the transparency of the universe with the fermi large area telescope
Humboldt-Universität zu Berlin 177 pp. () [10.18452/21374] = Dissertation, Humboldt-Universität zu Berlin, 2020  GO
Axionartige Teilchen sind pseudoscalare Teilchen welche in Theorien jenseits des Standardmodells vorhergesagt werden. Falls ein axionartiges Teilchen innerhalb eines kosmischen magnetischen Felds gebildet wird, wird dieses nicht durch das Hintergrundlicht absorbiert. [...]
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OpenAccess [PUBDB-2020-03572] Dissertation / PhD Thesis

Biophysical and structural characterization of the interaction of the circadian transcription factor BMAL1 with its coactivator CBP
1-151 () [10.3204/PUBDB-2020-03572] = Dissertation, Johannes Gutenberg University Mainz, 2020  GO
The mammalian CLOCK:BMAL1 transcription factor complex and its coactivators CREB-binding protein (CBP)/p300 and mixed-lineage leukemia 1 (MLL1) play a central role in circadian transcriptional regulation and chromatin modification. The interactions of BMAL1’s C-terminal transactivation domain (TAD) with the KIX domain of CBP/p300 (activating) and with CRY1 (repressing) as well as the BMAL1 G-region preceding the TAD regulate the circadian oscillations [...]
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OpenAccess [PUBDB-2020-03397] Dissertation / PhD Thesis
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Structural characterisation of peroxisomal import receptor complexes
1-155 () [10.3204/PUBDB-2020-03397] = Dissertation, Universitätsklinikum Hamburg-Eppendorf, 2017  GO
Peroxisomes are dynamic eukaryotic organelles that require import of their membrane and matrix proteins by soluble receptors in the cytosol. Their biogenesis, protein import, and proliferation are regulated by a distinct set of proteins, collectively called peroxins.Two peroxins, Pex3 and Pex19, are involved in the insertion of various Peroxisomal Membrane Proteins (PMPs) in the peroxisomal membrane and are thus crucial for its formation [...]
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OpenAccess [PUBDB-2020-02399] Book/Dissertation / PhD Thesis
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Magnon-Photon Interactions: From X-ray Mapping of Standing Spin Waves to Interference in Cavity Electromagnonics
Verlag Dr. Hut 147 pp. () [10.3204/PUBDB-2020-02399] = Dissertation, University of Hamburg, 2020  GO
This thesis describes two types of light-matter interactions in magnetic thin films. In the first part, it focuses on the resonant interaction of hard X-rays with 57Fe nuclei in a microstructured magnetic element. [...]
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OpenAccess [PUBDB-2020-02829] Dissertation / PhD Thesis
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Experimental Characterization of the Photocathode Laser System for Advanced 3D Pulse Shaping at PITZ
155 pp. () [10.3204/PUBDB-2020-02829] = Dissertation, Universität Hamburg, 2020  GO
Light is one of the most versatile tools in an experimenter’s toolbox and has been used toinvestigate the natural world since the invention of the lens and as new techniques, sources,and materials have been developed. One of the biggest turning points was the development ofa brilliant, coherent, light source: the laser. [...]
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OpenAccess [PUBDB-2020-04400] Dissertation / PhD Thesis
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STUDIES ON SOME BIPHENYL BENZOATEBASED CHIRAL LIQUID CRYSTALCOMPOUNDS
1-223 () [10.3204/PUBDB-2020-04400] = Dissertation, University of northbengal, 2020  GO
Due to the coexistence of liquid-like fluidity with conventional solidlike anisotropy, liquid crystals exhibit unique optical, dielectric or elasticproperties which make them suitable for a variety of technical andscientific applications, especially in display devices. The dielectric andelectro-optic properties of these materials, along with their phasebehaviour, are of immense importance from application perspective. [...]
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[PUBDB-2021-00120] Dissertation / PhD Thesis
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Heavy Dark Matter, Models and Methods of Detection beyond the Standard Paradigm
430 pp. () = Dissertation, University of Hamburg, 2020
Weakly Interacting Massive Particles (WIMPs) around the TeV scale have since long been among the best-motivated and most studied Dark Matter (DM) candidates. However, the absence of experimental evidence for such particles either in colliders, at telescopes or in underground laboratories, has stimulated model-building and studies of new methods of detection beyond the WIMP paradigm. [...]
OpenAccess [PUBDB-2020-03556] Dissertation / PhD Thesis
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Advanced Seeding Methods for Generation of Fully-Coherent Ultra-Short Soft X-Ray Pulses
285 pp. () [10.3204/PUBDB-2020-03556] = Dissertation, University of Hamburg, 2020  GO
In this thesis I am going to describe advanced seeding techniques to generate radiation in the region of EUV and soft X-ray and the properties of the generated radiation. I am going to focus on the echo-enabled harmonic generation (EEHG) scheme, recently shown in the soft X-ray region at the FERMI free-electron laser (FEL). [...]
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OpenAccess [PUBDB-2020-00885] Book/Report/Dissertation / PhD Thesis
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Development of a test DAQ system for the CMS Phase-2 outer tracker upgrade
[DESY-THESIS-2020-002]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 117 pp. () [10.3204/PUBDB-2020-00885] = Dissertation, Universität Hamburg, 2020  GO
The CMS detector at the LHC is foreseen to experience a major upgrade in order to cope with increased radiation flux due to the high-luminosity operation phase of the accelerator. The CMS tracker will be replaced completely, introducing a new module concept in the outer part of the subsystem, which will exploit the strong magnetic field inside the CMS detector to select high transverse momentum particles locally and send the corresponding information to the triggering system thus enhancing the efficiency of the latter.In order to allow for module prototyping and production testing, an intermediate DAQ system, referred to as μDTC, was developed in the scope of this thesis. [...]
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OpenAccess [PUBDB-2020-04478] Dissertation / PhD Thesis
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Mikrostrukturentwicklung während des TLP-Lötprozesses in $γ$-TiAl-Legierungen: In situ Experimente mit hochenergetischer Röntgenbeugung
151 pages: Illustrations, figures () [10.3204/PUBDB-2020-04478] = Dissertation, Christian-Albrechts-Universität zu Kiel, 2020  GO
The γ-TiAl alloys are characterized as high-temperature stable light metals. As material, they are used for blades in the low-pressure area of aircraft turbines [...]
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OpenAccess [PUBDB-2020-03350] Dissertation / PhD Thesis
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Ultra-high-energy cosmic-ray nuclei and neutrinos in models of gamma-ray bursts and extragalactic propagation
Humboldt-Universität zu Berlin 194 pp. () [10.18452/21386] = Dissertation, Humboldt University, 2020  GO
Utrahochenergetische kosmische Strahlung (ultra-high-energy cosmic rays -- UHECR) besteht aus ionisierten Atomkernen mit den höchsten Teilchenergien, die je gemessen wurden. Zwar wurden die Quellen von UHECRs noch nicht eindeutig identifiziert, doch gibt es deutliche Anzeichen, dass sie extragalaktisch sind. [...]
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OpenAccess [PUBDB-2020-02699] Book/Dissertation / PhD Thesis
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Primordial Nucleosynthesis in the Presence of MeV-scale Dark Sectors
[DESY-THESIS-2020-017]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 175 pp. () [10.3204/PUBDB-2020-02699] = Dissertation, Universität Hamburg, 2020  GO
In this thesis, we perform a comprehensive study of Big Bang nucleosynthesis constraints on different dark-sector models with $\mathrm{MeV}$-scale particles which are neither fully relativistic nor fully non-relativistic during all relevant temperatures. To this end, we derive a generic set of equations that can be used to determine the light-element abundances for many different dark-sector scenarios. [...]
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OpenAccess [PUBDB-2020-04330] Dissertation / PhD Thesis
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Quantitative analysis of in situ time-resolved RHEED during growth of self-catalysed GaAs nanowires
Karlsruhe 1-171 () [10.5445/IR/1000122870] = Dissertation, Karlruhe Institute of Technology, 2020  GO
Die morphologischen und kristallographischen Eigenschaften vertikaler, freistehender Nanodrähte, welche mittels der Dampf-Flüssigkeits-Feststoff-Methode (VLS) gezüchtet werden, sind durch ein kompliziertes Wechselspiel der Wachstumsparameter während des Herstellungsprozesses beeinflusst. Das Verständnis und die Kontrolle dieser dynamischen Prozesse sind folglich Voraussetzung für die Herstellung von Nanodrähten mit maßgeschneiderten Eigenschaften. [...]
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OpenAccess [PUBDB-2020-02312] Book/Dissertation / PhD Thesis
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Generation and control of ultrafast 10µm laser pulses for driving chemical dynamics
München : Dr. Hut 1-145 () [10.3204/PUBDB-2020-02312] = Dissertation, University of Hamburg, 2019  GO
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OpenAccess [PUBDB-2020-04833] Dissertation / PhD Thesis
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Disentangling the photophysics of ionized biomolecules in microsolvated environments
Hamburg 141 pp. () [10.3204/PUBDB-2020-04833] = Dissertation, University of Hamburg, 2020  GO
Water is vital for the existence of life on earth, and therefore, it is dubbed as the matrix of life. Furthermore, the hydration environment plays diverse functional, structural, and dynamic roles in molecular cell biology. [...]
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[PUBDB-2021-00723] Dissertation / PhD Thesis

The structure of biocrystals of DPS-DNA according to electron tomgraphy
Moscow 1-24 () = Dissertation, Shubnikow Institute of Crystallography, 2020
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OpenAccess [PUBDB-2020-04726] Dissertation / PhD Thesis
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A Search for Extended Gamma-Ray Emission from the Galactic Center with VERITAS
Humboldt-Universität zu Berlin 179 pp. () [10.18452/21307] = Dissertation, Humboldt-Universität zu Berlin, 2020  GO
Dunkle Materie bindet etwa 24 % der gesamten Energie im Universum. Bis heute ist jedoch dessen Ursprung nicht bekannt. [...]
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OpenAccess [PUBDB-2020-00626] Dissertation / PhD Thesis

Search for invisible decays of the Higgs boson produced invector-boson fusion in final states with jets and large missingtransverse energy with the ATLAS detector
214 pp. () [10.3204/PUBDB-2020-00626] = Dissertation, University of Hamburg, 2020  GO
The Standard Model of particle physics is a very successful theory, but it leaves some openquestions. Especially the topic of dark matter is a very active field of research and the discoveryof dark matter candidates might be accessible to modern collider experiments. [...]
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OpenAccess [PUBDB-2020-03187] Book/Dissertation / PhD Thesis
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Measuring luminosity and the $\mathrm{t}\bar{\mathrm{t}}\mathrm{Z}$ production cross section with the CMS experiment
[DESY-THESIS-2020-020]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 164 pp. () [10.3204/PUBDB-2020-03187] = Dissertation, Universität Hamburg, 2020  GO
Measurements of the luminosity and of top quark pair production in association with a Z boson ($\mathrm{t}\bar{\mathrm{t}}\mathrm{Z}$) in proton-proton collisions with the CMS experiment at the LHC are presented.The luminosity measurement of the CMS experiment is calibrated with the Van der Meer (VdM) method, based on data collected during beam separation scans. A calibration of the length scale is performed using data from constant-separation scans. [...]
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OpenAccess [PUBDB-2020-03399] Dissertation / PhD Thesis

Structure and Function of a guarded Arabidopsis Immune Signaling Ubiquitin Ligase
1-199 () [10.3204/PUBDB-2020-03399] = Dissertation, University of Hamburg, 2020  GO
The Arabidopsis thaliana E3 ubiquitin ligase SAUL1 (SENESCENCE-ASSOCIATED E3 UBIQUITIN LIGASE 1), which acts as a positive regulator during pattern-triggered immunity (PTI), is characterized by two intriguing hallmarks.(i) On the one hand, SAUL1 is guarded by two heteromeric nucleotide-binding leucine-rich repeat protein (NLR) complexes. These initiate an inducible effector-triggered immunity (ETI) in the saul1 1 mutant [...]
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OpenAccess [PUBDB-2020-01054] Book/Report/Dissertation / PhD Thesis
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Studying chiral molecules with broadband microwave spectroscopy
[DESY-THESIS-2020-004]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 204 pp. () [10.3204/PUBDB-2020-01054] = Dissertation, Universität Hamburg, 2019  GO
Natural essential oils are complex mixtures containing several compounds of structural similarity.They are well known for their wide range of applications in different areas, frommedicine to cosmetics. One of the conventional methods for their quantitative analysis is gaschromatography (GC). [...]
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OpenAccess [PUBDB-2020-02257] Book/Dissertation / PhD Thesis
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Studies towards Acceleration of Relativistic Electron Beamsin Laser-driven Dielectric Microstructures
[DESY-THESIS-2020-009]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 124 pp. () [10.3204/PUBDB-2020-02257] = Dissertation, Universität Hamburg, 2020  GO
In this work an approach to relativistic electron acceleration employing laser-driven dielectric microstructures (DLA) is considered. New DLA designs were developed, a simulation code for efficient DLA simulation was devised, the capabilities of dielectric microstructures as particle beam diagnostic devices were investigated and a laser induced damage threshold measurement setup was implemented and tested.To leverage well developed near-infrared laser sources new DLAs were designed that are robust against realistic manufacturing tolerances and exhibit a predicted increased electron transmission of up to \SI{44}{\percent} of the charge and longitudinal acceptance of around \SI{2}{\femto\second}, but are still able to produce \SI{}{\giga\volt/\meter} acceleration gradients. [...]
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OpenAccess [PUBDB-2020-00969] Book/Report/Dissertation / PhD Thesis
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Measurement of the top quark mass in the all-jets final state at $\sqrt{s}=13$ TeV and combination with the lepton+jets channel
[DESY-THESIS-2020-003]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 189 pp. () [10.3204/PUBDB-2020-00969] = Dissertation, Universität Hamburg, 2020  GO
A measurement of the top quark mass using LHC proton-proton collision data with an integratedluminosity of $35.9\text{fb}^{-1}$ is presented.The dataset has been recorded with the CMS detector in LHC Run 2 at a center-of-mass energyof $13$ TeV in the 2016 data taking period.Events are selected in which a top quark and a top antiquark are produced and both decay exclusively to jets.This $\text{t}\overline{\text{t}}$ all-jets final state is characterized by six jets in the detector and therefore contaminatedby multijet background, which is estimated from data in a control region.A kinematic fit is utilized to reconstruct the full $\text{t}\overline{\text{t}}$ system, improving the invariant mass resolution forthe top quark candidates and at the same time reducing the multijet background by requiring a goodness-of-fit criterion.The top quark mass is extracted using the ideogram method, simultaneously constraining an additional jet energy scale factor(JSF) to reduce systematic uncertainties.The top quark mass is found to be $m_{\text{t}}=172.34\pm0.20\,\text{(stat+JSF)}\pm0.70\,\text{(syst)}$ GeV, agreeing well with previous measurements.Furthermore, a combined top quark mass measurement using the all-jets and lepton+jets final states simultaneously isperformed.For this, a combined likelihood including the events of both final states is constructed and the same mass extractionis applied as for the all-jets final state.The resulting measurement is $m_{\text{t}}=172.26\pm0.07\,\text{(stat+JSF)}\pm0.61\,\text{(syst)}$ GeV.This is the first time a top quark mass measurement combining both final states in a single likelihood functionis presented.The result is consistent with other measurements at the LHC.A global electroweak fit employing this measurement shows the importance of the top quark mass for consistency checksof the standard model of particle physics..
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OpenAccess [PUBDB-2020-03113] Dissertation / PhD Thesis

Search for Dark Matter Produced in Association with Heavy Standard Model Particles at s√=13 TeV with the ATLAS Detector at the LHC
201 pp. () [10.3204/PUBDB-2020-03113] = Dissertation, University of Hamburg, 2020  GO
Dark Matter composes a significant part of the Universe, while its physical nature remains unknown. This thesis presents two searches for Dark Matter produced in association with heavy Standard Model particles using pp collision data at a center-of-mass energy of s√=13 TeV recorded by the ATLAS detector at the Large Hadron Collider. [...]
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OpenAccess [PUBDB-2020-03132] Book/Dissertation / PhD Thesis

Processes, microstructure, and mechanical properties of cold-rolled medium-Mn steel
Aachen : Aachen : Verlagshaus Mainz GmbH 1-127 () [10.18154/RWTH-2020-01850] = Dissertation, RWTH Aachen, 2019  GO
Medium-Mn steel has drawn tremendous attention recently for automotive lightweight applications, because of its excellent combination of high strength and superior formability. The present work aims at an in-depth understanding of the process-microstructure-property relationship in medium-Mn steel. [...]
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OpenAccess [PUBDB-2020-04685] Bachelor Thesis
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Untersuchung der Entwicklung von gamma-ähnlichen Protonschauern mit den hadronischen Wechselwirkungsmodellen EPOS-LHC und QGSJETII-04
48 pp. () [10.3204/PUBDB-2020-04685] = Bachelorarbeit, Humboldt-Universität zu Berlin, 2020  GO
Hadronische Wechselwirkungsmodelle spielen eine zentrale Rolle in der Teilchenphysik, weil sie unter anderem zum Vergleich experimenteller Daten von durch Cherenkov-Teleskopen detektierten Luftschauern genutzt werden, um Eigenschaften des primären Luftschauerteilchens abzuleiten. In dieser Arbeit werden die beiden hadronischen Wechselwirkungsmodelle EPOS-LHC und QGSJETII-04 für gamma-ähnliche Luftschauer in deren ersten Wechselwirkung durch Monte Carlo Simulationen untersucht. [...]
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OpenAccess [PUBDB-2020-03615] Master Thesis
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Electron beam characterization based on seeded FEL properties
94 pp. () [10.3204/PUBDB-2020-03615] = Masterarbeit, University of Hamburg, 2020  GO
In this thesis a method for electron beam slice diagnostic has been developed.The method is applicable to the drive beam of high-gain FELs operating in seededor SASE mode.It is essentially a time-resolved electron beam parameter estimationbased on experimental data on both projected and time-resolved beam propertiesand a theoretical model implemented in a numerical FEL-simulation code.This approach allows to take into account many independent measurements onelectron bunch (e.g. emittance, energy spread, current), electron optical functions,FEL-amplifier (gain length), and FEL-output radiation(wavelength, power) and deducevarious otherwise experimentally inaccessible quantities like slice parameters,initial bunching, or induced energy modulation. [...]
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OpenAccess [PUBDB-2020-01394] Bachelor Thesis

Improving Tape Restore Request Scheduling in the Storage System dCache
74 pages () [10.3204/PUBDB-2020-01394] = Bachelorarbeit, FH Wedel, 2020  GO
This thesis aims to improve the data recall efficiency from magnetic tape to disk by optimizing the request scheduling within the scientific disk storage system dCache. It is written in the context of the future data management challenges by the ATLAS experiment, where the high luminosity configuration will require an order of magnitude more storage capacity than can be provided by the current funding and usage model. [...]
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OpenAccess [PUBDB-2021-00240] Dissertation / PhD Thesis
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Mesoscopic materials studied with advanced X-ray scattering methods
Hamburg : Staats- und Universitätsbibliothek Hamburg 170 pp. () [10.3204/PUBDB-2021-00240] = Dissertation, University of Hamburg, 2020  GO
Mesoscopic materials form the bridge between the quantum world of atomic systems and the classical world of macroscopic systems. The characteristic length scale of such structures is in the range of hundreds of nanometers which is comparable to visible light wavelengths. [...]
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[PUBDB-2021-01464] Master Thesis
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A Search for High-Energy Neutrinos from Core-Collapse Supernovae
92 pp. () = Masterarbeit, Humboldt Universität zu Berlin, 2020
Since the discovery of high energetic cosmic rays their origin poses an open question. High- energy neutrino emission is considered a smoking-gun signature of cosmic ray production. [...]
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OpenAccess [PUBDB-2021-00195] Dissertation / PhD Thesis
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Untersuchung der photoinduzierten Dynamik in Clustern sowie Pulslängenbestimmung am FEL mittels THz-Lichtfeld-Streaking
Technische Universität Berlin 121 pp. () [10.14279/DEPOSITONCE-10549] = Dissertation, Technische Universität Berlin, 2020  GO
Freie-Elektronen-Laser (FEL) stellen femtosekundenlange, hochintensive und kohärente Lichtpulse im XUV- und Röntgenbereich zur Verfügung. Sie ermöglichen dadurch einen Zugang zu einem zuvor unerschlossenen Parameterbereich innerhalb der Röntgenphysik und erlauben es, die Struktur und Dynamik von Materie auf natürlichen Zeit- und Längenskalen zu untersuchen. [...]
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OpenAccess [PUBDB-2020-03904] Bachelor Thesis
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Influence of TMAO on the Dynamics and Gelation of PNIPAm colloids
53 pp. () [10.3204/PUBDB-2020-03904] = Bachelorarbeit, University of Hamburg, 2020  GO
This thesis studies the dynamics of a colloidal suspension, consisting of concentrated nan-oparticles with a silica core and a polymer shell of poly(N-isopropylacrylamide) (PNIPAm)suspended in water. The thermosresponsive polymer PNIPAm is known for its volume phasetransition at a lower critical solution temperature (LCST) of about 32−33◦C [...]
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OpenAccess [PUBDB-2020-02143] Book/Report/Dissertation / PhD Thesis
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Search for Light Bosons in Exotic Decays of the 125 GeV Higgs Boson
[DESY-THESIS-2020-007]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 173 pp. () [10.3204/PUBDB-2020-02143] = Dissertation, Universität Hamburg, 2020  GO
A search for pairs of light bosons produced from decays of the 125 GeV Higgs boson is presented. The search covers the light boson mass region where the particle could have an enhanced decay rate to a pair of τ leptons, according to different models and scenarios.The leptonic decay channels corresponding to the 4τ and 2μ2τ final states are used. [...]
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OpenAccess [PUBDB-2021-01462] Master Thesis
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Optimizing the triggering strategy for the detection of cosmic rays with the Radio Neutrino Observatory Greenland (RNO-G)
90 pp. () [10.3204/PUBDB-2021-01462] = Masterarbeit, Humboldt Universität zu Berlin, 2020  GO
A promising technique to measure neutrinos above 10 PeV is the detection of radio signals generated by the Askaryan effect. The effect is caused by neutrino-induced particle cascades in dense media e.g. [...]
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[PUBDB-2020-04409] Bachelor Thesis
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The effect of stoichiometric variations on performance in CIGS solar cells measured using X-ray microscopy
1-66 () = Bachelorarbeit, Universität Hamburg, 2020
Scanning X-ray microscopy measurements are an indespensible tool of solar cell research to-day, and the compatibility with complementary measurement modes is a particular strength. This Bachelor’s thesis investigates a series of thin-film solar cells with a Cu(In,Ga)Se2(CIGS) absorber layer that differ in their overall ratio of gallium to indium, resulting in a varyingbandgap. [...]
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OpenAccess [PUBDB-2020-03053] Dissertation / PhD Thesis
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Charge-density-wave ordering in three-dimensional metallic compounds
Bayreuth : University of Bayreuth 168 pp. () [10.15495/EPUB_UBT_00004900] = Dissertation, University of Bayreuth, 2020  GO
The Charge-density-wave (CDW) is a static modulation of the density of conduction electrons which is accompanied by a periodic distortion of the lattice. Although CDW mechanisms have been established in one-dimensional (1D) and two-dimensional (2D) systems, the driving force behind the CDW remains an enigma for three-dimensional (3D) systems. [...]
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OpenAccess [PUBDB-2020-04872] Dissertation / PhD Thesis
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Aspects of Rare Production and Decay Processes of the Higgs Boson
221 pp () [10.3204/PUBDB-2020-04872] = Dissertation, University of Hamburg, 2020  GO
The Higgs boson is the most recent fundamental particle to be experimentally observed. Due to its large mass and its couplings to massive bosons and fermions, it has a wide variety of decay channels. [...]
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OpenAccess [PUBDB-2020-02589] Book/Dissertation / PhD Thesis
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Searching for Heavy Particles Coupled to Top Quarks with CMS
[DESY-THESIS-2020-015]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 239 pp. () [10.3204/PUBDB-2020-02589] = Dissertation, Universität Hamburg, 2020  GO
In this thesis, two searches for new heavy particles with top quarks in the final stateare presented. They are based on data recorded by the CMS detector in the years 2016and 2017, respectively.In the first part of this thesis, the first search for pair-produced leptoquarks (LQs)decaying to top quarks and muons is presented [...]
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OpenAccess [PUBDB-2020-03976] Bachelor Thesis
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Application of machine learning in the kinematic reconstruction of $t\bar{t}$ events
59 pp. () [10.3204/PUBDB-2020-03976] = Bachelorarbeit, University of Hamburg, 2020  GO
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OpenAccess [PUBDB-2020-05067] Dissertation / PhD Thesis
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Experimental and theoretical studies on electron-beam focusing using active plasma lenses
105 pp. () [10.3204/PUBDB-2020-05067] = Dissertation, University of Hamburg, 2020  GO
This work assesses the potential of active plasma lenses to deliver stable, quality-preservingfocusing for high energy electron beams. It first provides a theoretical framework for understanding the focusing mechanisms of active plasma lenses. [...]
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OpenAccess [PUBDB-2020-04780] Dissertation / PhD Thesis
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Elektronenspektroskopische Untersuchungen der induzierten Spinübergänge von Eisen(II)-Komplexverbindungen auf metallischen, magnetischen und halbleitenden Oberflächen
141 pp. () [10.3204/PUBDB-2020-04780] = Dissertation, University of Kiel, 2020  GO
Molecular spintronics is an emerging research field exploiting the versatility of organic molecular electronics together with the spin degree of freedom as information carrier. Especially the use of functional organic molecules in this area opens perspective for highly integrated spintronic devices [...]
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OpenAccess [PUBDB-2020-03793] Book/Dissertation / PhD Thesis
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Characterization of Silicon Modules and Sensors for the ATLAS Inner Tracker Strip Detector
[DESY-THESIS-2020-021]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 176 pp. () [10.3204/PUBDB-2020-03793] = Dissertation, Universität Hamburg, 2020  GO
For the High-Luminosity LHC, the ATLAS Experiment will replace the current tracking system with an all-silicon detector, the Inner Tracker (ITk), consisting of inner pixel layers and outer strip layers. The ITk Strip Detector will operate in a much harsher environment than the current strip detector, the Semiconductor Tracker (SCT). [...]
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OpenAccess [PUBDB-2021-01241] Book/Dissertation / PhD Thesis
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Photon-Photon processes at the International Linear Collider and BSM signatures with small mass differences
[DESY-THESIS-2021-002]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY THESIS 221 pp. () [10.3204/PUBDB-2021-01241] = Dissertation, Universität Hamburg, 2020  GO
The International Linear Collider is a proposed $e^{+}e^{-}$ collider with tunable centre-of-mass energies and polarised beams. By performing high-precision measurements of Standard Model observables and searches for new particles the ILC can serve as a complementary machine to the LHC.In supersymmetric extensions of the Standard Model, higgsino-like charginos and neutralinos are preferred to have masses of the order of the electroweak scale by naturalness arguments. [...]
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OpenAccess [PUBDB-2021-00197] Dissertation / PhD Thesis
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Zeitaufgelöste Dynamik von Clustern in intensiven extrem ultravioletten Doppelpulsen ; Time-resolved dynamics of clusters in intense extreme ultraviolet double-pulses
Technische Universität Berlin 216 pp. () [10.14279/DEPOSITONCE-10927] = Dissertation, Technische Universität Berlin, 2020  GO
With their brilliant short-wavelength light pulses, free-electron lasers (FEL) enable an unique insight into the interaction of light and matter. By recording scattering patterns, coherent diffractive imaging allows to image and investigate single nanometer-sized particles. [...]
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OpenAccess [PUBDB-2020-04202] Book/Dissertation / PhD Thesis
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Axion direct detection in particle and condensed matter physics
[DESY-THESIS-2020-024]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 175 pp. () [10.3204/PUBDB-2020-04202] = Dissertation, Universität Hamburg, 2020  GO
The first part of this thesis investigates the direct detection of axions in particle physics. A generalized matrix formalism for describing axion-photon mixing in multi-layer systems to all orders in the axion-photon coupling is developed and applied for studying light shinning through a wall (LSW) experiments with and without dielectric layers. [...]
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OpenAccess [PUBDB-2020-02465] Dissertation / PhD Thesis

Self-assembly of confined liquid crystals: from nanoscale physics to designing photonic metamaterials
TUHH Universitätsbibliothek 1 - 114 () [10.15480/882.2787] = Dissertation, Hamburg University of Technology, 2020  GO
Liquid crystals in combination with nanoporous media, exhibiting structures significantly smaller than the wavelengths of visible light, are promising candidates to design new soft-hard photonic metamaterials. The liquid crystal provides functionality, resulting from temperature tunable anisotropic properties, i.e. [...]
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OpenAccess [PUBDB-2020-02176] Book/Report/Dissertation / PhD Thesis
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Search for supersymmetric particles in gluino-gluino pair production events at CMS
[DESY-THESIS-2020-008]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY THESIS 133 pp. () [10.3204/PUBDB-2020-02176] = Dissertation, Universität Hamburg, 2019  GO
A search for gluino pair production with events using 35.9 fb−1of data from ppcollisions at a center-of-mass energy of 13 TeV in 2016 is presented. Two differentcascade decay modes of gluinos are considered, and separate analyses for each of themodels are performed [...]
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OpenAccess [PUBDB-2020-04692] Dissertation / PhD Thesis

Allosteric regulation of human tryptophan hydroxylase isoform 2 (hTPH2)
1-279 () [10.3204/PUBDB-2020-04692] = Dissertation, Technical University of Denmark, 2020  GO
Tryptophan hydroxylase catalyzes the rate-limiting reaction in the biosynthesis pathway of serotonin, one of the most ubiquitous and multifunctional neurotransmitters. The influence of the serotonergic system extends over many functions of the human body, ranging from temperature and muscle tone control, to mood and sleep regulation [...]
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OpenAccess [PUBDB-2020-04068] Dissertation / PhD Thesis
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Digital Control Systems in the Regeneration Cavity of ALPS IIa
133 pp. () [10.3204/PUBDB-2020-04068] = Dissertation, Leibniz Universität Hannover, 2020  GO
ALPS II is a light-shining-through-a-wall experiment that will search for axion-like particles. These experiments seek to generate and measure axion-like particles in a laboratory using oscillations between photons and axions in the presence of a magnetic field. [...]
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OpenAccess [PUBDB-2020-02962] Book/Dissertation / PhD Thesis
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Precise predictions for Higgs physics in supersymmetric models
[DESY-THESIS-2020-019]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 196 pages : illustrations, fugires () [10.3204/PUBDB-2020-02962] = Dissertation, Universität Hamburg, 2020  GO
In the Minimal Supersymmetric Standard Model (MSSM), the mass of the SM-like Higgs boson can be predicted in terms of the model parameters and therefore used as a precision observable to constrain the MSSM parameter space. The precise prediction of the lightest MSSM Higgs boson mass in scenarios with one or several heavy supersymmetric particles requires the resummation of higher-order logarithmic contributions obtained within an effective-field-theory (EFT) approach. [...]
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[PUBDB-2020-04396] Master Thesis

Substitutional Doping Study on a Skyrmion Lattice with Giant Topological Hall Effect
121 pp. () = Masterarbeit, Technical University of Munich, 2020
OpenAccess [PUBDB-2020-02258] Book/Dissertation / PhD Thesis
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3D Multimodal X-ray microscopy of biological specimens
[DESY-THESIS-2020-010]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 164 pp. () [10.3204/PUBDB-2020-02258] = Dissertation, Universität Hamburg, 2019  GO
Studies of biological systems typically require the application of several complementary methods able to yield statistically-relevant results at a unique level of sensitivity. Long penetration depth of X-rays makes them particularly suitable for non-destructive volumetric investigations of whole cells and tissue sections, providing structural and elemental specificity at nanoscale spatial resolutions.X-ray ptychography is a promising imaging technique for sub-100-nm structural studies of weakly-scattering extended biological specimens. [...]
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OpenAccess [PUBDB-2020-02988] Master Thesis
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Optimization of the $\pi^0$ reconstruction selections for the Belle II experiment
[BELLE2-MTHESIS-2020-001]
Mainz : Johannes Gutenberg University Mainz 135 pp. () [10.3204/PUBDB-2020-02988] = Masterarbeit, Johannes Gutenberg University, Institute of Nuclear Physics Mainz, 2019  GO
The purpose of this thesis is to provide optimized selections for the $π^0$ reconstruction in the Belle II analysis software framework (basf2). basf2 provides generic selections on photons and on pi0s reconstructed via pi0->gg, which are designed to provide a certain pi0 reconstruction efficiency. [...]
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OpenAccess [PUBDB-2020-02431] Dissertation / PhD Thesis
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Alignment and Orientation of Complex Molecules
154 pages () [10.3204/PUBDB-2020-02431] = Dissertation, University of Hamburg, 2020  GO
Aligning and orienting molecules with external electric fields has long been of greatinterest in physical chemistry. Among the principle applications are various singlemolecule imaging techniques employed with the goal to determine transient molecularstructures during dynamical processes. [...]
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OpenAccess [PUBDB-2020-02325] Dissertation / PhD Thesis
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Development of diffraction analysis methods for serial crystallography
1-153 () [10.3204/PUBDB-2020-02325] = Dissertation, University of Hamburg, 2020  GO
Serial crystallography, initially developed for use at X-ray free-electron lasers, has openednew opportunities to investigate structure and dynamics of biomolecules at physiologicallyrelevant temperatures. It has since spread out to 3 rd generation synchrotron sources whereit allows us to measure protein microcrystals at room temperature, perform time-resolvedexperiments on biological crystals and obtain structures of radiation-sensitive proteins. [...]
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OpenAccess [PUBDB-2021-03492] Dissertation / PhD Thesis
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Searching for Heavy Higgs Bosons Using Events with Leptons and Missing Transverse Momentum with the ATLAS Detector
170 pp. () [10.3204/PUBDB-2021-03492] = Dissertation, University of Hamburg, 2020  GO
An additional heavy Higgs boson is predicted by many models, such as the two-Higgs-doublet model (2HDM). This thesis presents a data-driven method to estimate the dominant ZZ background in the search for the decay of such a heavy scalar particle to a pair of Z bosons in the ZZ → ℓ$^+$ℓ$^−$ν$\overline{v}$ (l = electrons, muons, ν = neutrinos) final state. [...]
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OpenAccess [PUBDB-2020-02277] Book/Dissertation / PhD Thesis
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Search for Higgs bosons in the final state with b-quarks in the semi-leptonic channel with the CMS 2017 data
[DESY-THESIS-2020-012]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 205 pp. () [10.3204/PUBDB-2020-02277] = Dissertation, Universität Hamburg, 2020  GO
The existence of several neutral Higgs states is predicted in many models comprising an enlargement of the Standard Model (SM) scalar sector, notably the general Two-Higgs-Doublet Model (2HDM) and the Minimal Supersymmetric Extension of the Standard Model (MSSM). Many of these scenarios predict an enhancement of the coupling of the neutral Higgs bosons to bottom quarks. [...]
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OpenAccess [PUBDB-2021-00189] Dissertation / PhD Thesis
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Fast and Ultrafast Multiphoton-Multicolour Ionization and Spectroscopy of Small Quantum Systems
126 pp. () [10.3204/PUBDB-2021-00189] = Dissertation, Dublin CIty University; Military University of Technology, Warsaw, 2020  GO
The interaction of atoms (Kr) and small molecules (CO$_2$,CH$_4$), with laser light emit-ted by different types of sources was investigated.Photoelectron spectroscopy was applied to study the two photon double ionizationof krypton, induced by free electron laser (FEL) photons at 25.2 eV. Velocity mapimaging (VMI) spectroscopy was also used to record the angular distributions ofthe photoelectrons for both the first and second ionization steps [...]
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OpenAccess [PUBDB-2021-03433] Dissertation / PhD Thesis
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Fast and ultrafast multiphoton-multicolour ionization and spectroscopy of small quantum systems
126 pp. () [10.3204/PUBDB-2021-03433] = Dissertation, Dublin City University/MUT Warsaw, 2020  GO
The interaction of atoms (Kr) and small molecules (CO$_2$, CH$_4$), with laser light emit- ted by different types of sources was investigated.Photoelectron spectroscopy was applied to study the two photon double ionization of krypton, induced by free electron laser (FEL) photons at 25.2 eV. Velocity map imaging (VMI) spectroscopy was also used to record the angular distributions of the photoelectrons for both the first and second ionization steps [...]
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OpenAccess [PUBDB-2020-02268] Book/Dissertation / PhD Thesis
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Concept and Development of Enhanced Lateral Drift (ELAD) Sensors
[DESY-THESIS-2020-014]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 192 pp. () [10.3204/PUBDB-2020-02268] = Dissertation, Universität Hamburg, 2019  GO
In this dissertation the concept of a new type of silicon tracking sensor called Enhanced Lateral Drift (ELAD) sensor is presented. This technology is created to meet the requirements for future linear e+e− colliders vertex and tracking detectors. [...]
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OpenAccess [PUBDB-2021-00194] Dissertation / PhD Thesis
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Interaction of short-wavelength laser pulses with matter on various time scales
127 pp. () [10.3204/PUBDB-2021-00194] = Dissertation, Institute of Physics of Charles University, Prague, 2020  GO
An advent of powerful sources producing intense and ultrashort laserpulses containing high-energy photons opened up a wide range of possibilitiesto conduct experiments formerly achievable only through theoretical calculationsand models. This thesis provides a complex overview of processes which occurright after arrival of the first photons, through lattice heating, up to resolidifica-tion and formation of irreversible changes [...]
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[PUBDB-2020-05241] Master Thesis
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Nonlinear Herriott-type Multipass Cells Pulse Post-Compression at High Compression Factor
- () = Masterarbeit, Ruhr University Bochum, 2020
OpenAccess [PUBDB-2021-00196] Dissertation / PhD Thesis
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Novel THz-streak Experiment for Time Resolved Measurement of Ultrafast Inner-and Interatomic Coulombic Decays
101 pp. () [10.3204/PUBDB-2021-00196] = Dissertation, University of Hamburg, 2020  GO
In the present work, time-resolved measurement techniques with resolutions in the femtosecond range were used to understand electronic excitations better and thus the formation and breaking of chemical bonds. Electrical excitations occur on a time scale in the attosecond to femtosecond range, and therefore ultra-short pulses in the extreme ultraviolet (XUV) range are needed to excite these processes [...]
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OpenAccess [PUBDB-2020-02478] Dissertation / PhD Thesis
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Modeling and Numerical Studies ofLaser-Based Terahertz Generation
132 pp. () [10.3204/PUBDB-2020-02478] = Dissertation, University of Hamburg, 2020  GO
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OpenAccess [PUBDB-2020-04032] Master Thesis
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Transverse Momentum Dependent Parton Density Function for the Photon
56 pp. () [10.3204/PUBDB-2020-04032] = Masterarbeit, University of Hamburg, 2020  GO
This thesis examines collinear and transverse momentum dependent parton density functions (PDFs and TMDs) for the photon. To that end, I helped to implement the photoncontribution into the parton evolution programme uPDFevolv. [...]
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OpenAccess [PUBDB-2020-04382] Dissertation / PhD Thesis

Strong-field photoelectron imaging of complex molecules
Hamburg : Staats- und Universitätsbibliothek Hamburg 114 pp. () [10.3204/PUBDB-2020-04382] = Dissertation, University of Hamburg, 2020  GO
Strong-field ionisation imaging offers elegant ways to measure and visualise molecular structure with picometre spatial and femtosecond temporal resolution. The underlying ionisation process is driven by an intense laser-electric field and allows to selectively extract a single electron from the outermost valence orbital(s) of the target molecule. [...]
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OpenAccess [PUBDB-2020-02479] Book/Dissertation / PhD Thesis
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Oblique-incidence deposition of ferromagnetic thin films and their application in magnetoresistive sensors
245 pp. () [10.3204/PUBDB-2020-02479] = Dissertation, University of Hamburg, 2020  GO
Magnetic field sensors can be used for compass applications, to measure electrical cur-rents or to determine position and speed of objects. Layered thin-film sensors based onthe giant or tunneling magnetoresistance (GMR or TMR) are predestined for portabledevices where their small size, high effect strength and low power consumption are crucial.Through the use of oblique-incidence deposition (OID) it is possible to tailor the magneticand magnetoresistive properties of the sensors in an easy-accessible and flexible way tothe needs of an application. [...]
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[PUBDB-2020-01735] Dissertation / PhD Thesis

Emittance Measurements at Laser-Wakefield Accelerators
145 pp. () = Dissertation, University of Hamburg, 2019
Laser-wakefield accelerators enable the generation of electron beams with initially nm-small emittances and GeV-level beam energies within cm-scale distances and are thereforepromissing candidates for drivers of future experiments. However, the percent-level energy-spreads and shot-to-shot fluctuations in beam quality can pose a limit to the transportability of plasma-generated beams, and further impete the measurement of the beam emittance using conventional methods.In the framework of this thesis, two energy-resolved phase-space diagnostics, a single-shot and a multi-shot method, have been implemented at the LUX laser-plasma accelerator.Electron beams from ionization injection are imaged by a compact quadrupole doublet from a virtual source into a dispersive electron spectrometer, which allows to measurethe beam emittance, beam size, divergence and phase-space correlation on the singleenergy-slice level. [...]
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OpenAccess [PUBDB-2020-04003] Book/Dissertation / PhD Thesis
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Pump-probe experiments, driven by high-field THz pulses, shaped by double electron bunches at FLASH
[DESY-THESIS-2020-025]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 123 pp. () [10.3204/PUBDB-2020-04003] = Dissertation, Universität Hamburg, 2020  GO
The Free Electron Laser in Hamburg (FLASH) has a unique combination of high repetitionrate, tunable, intense, and narrowband THz pulses naturally synchronized to the XUV pulses.It provides the opportunity to investigate light-matter interaction on an ultrafast timescale.However, due to the different properties of THz and XUV radiation, the optical transport differsfor these pulses. The result is that the optical path of the THz beamline is several meters longerthan the XUV beamline, preventing the utilization of the full potential of FLASH. [...]
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OpenAccess [PUBDB-2020-02476] Master Thesis

The Performance of Double Cascades Identification in IceCube-Gen2
111 pp. () [10.3204/PUBDB-2020-02476] = Masterarbeit, Humboldt University Berlin, 2020  GO
The IceCube Neutrino Observatory is a cubic-kilometer in-ice Cherenkov detector located at the South Pole. At high energies, the neutrino flux of is expected to be observed in the ratio of 1 : 1 : 1 on Earth. [...]
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[PUBDB-2020-04411] Bachelor Thesis
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Analysis of Synchrotron-Based X-Ray Fluorescence Measurements from Multiple Detector Modules
1-36 () = Bachelorarbeit, Universität Hamburg, 2020
X-ray fluorescence measurements are an ideal method for measuring the elemental distributions in samples but complications like self absorption make the evaluation of these measurements non-trivial – especially when using multiple detector modules. This is further complicated when studying low concentrations of elements, where accurate background subtraction and elemental sensitivity is essential. [...]
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