DISSERTATIONEN - MASTERARBEITEN - BACHELORARBEITEN 2019



OpenAccess [PUBDB-2020-00203] Book/Report/Dissertation / PhD Thesis
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Top Quark Spin and Polarization Properties in Searches for New Phenomena with the CMS Detector at the LHC
[DESY-THESIS-2020-001]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 283 pp. () [10.3204/PUBDB-2020-00203] = Dissertation, Universität Hamburg, 2019  GO
In this work, a search for heavy pseudoscalar and scalar (A/H) Higgs bosons decaying to top-anti-top quark pairs (t ̄t) and a measurement of top quark polarization and t ̄t spin correlation are presented, performed using 35.9 /fb of data recorded by the CMS experiment in 2016. The dileptonic t ̄t final state is investigated in both analyses.The A/H Higgs boson search exploits the 2-dimensional spectrum of t ̄t invariant mass and an angular observable sensitive to both the spin and parity of the t ̄t system. [...]
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OpenAccess [PUBDB-2019-02902] Book/Report/Dissertation / PhD Thesis
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Ultrafast Nuclear Dynamics Induced by Light from the XUV to the THz Range
[DESY-THESIS-2019-017]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 79 pp. () [10.3204/PUBDB-2019-02902] = Dissertation, Universität Hamburg, 2019  GO
With recent advances in the generation of ultrashort laser pulses, electron and nuclear dynamics in molecules can be investigated on their natural, atto- to femtosecond timescale. This opens up the investigation of many interesting phenomena, including primary events in chemistry and biology. [...]
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OpenAccess [PUBDB-2019-01791] Book/Report/Dissertation / PhD Thesis
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Numerical beam stability studies in external injection plasma-wakefield acceleration regimes
[DESY-THESIS-2019-005]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 177 pp. () [10.3204/PUBDB-2019-01791] = Dissertation, Universität Hamburg, 2019  GO
This work considers the phase-space evolution of an externally injectedelectron beam under various plasma-based acceleration scenariosusing numerical methods.Plasma wakefield acceleration, an exceptional technology with thepotential to drive the next generation of particle accelerators, uses aparticle driver to excite a wakefield carrying gradients in the rangeof10 GV m−1to100 GV m−1, orders of magnitude higher than theconventional cavities currently available. However, the plasma envi-ronment has stringent requirements with respect to acceptable beamparameters which need to be carefully analyzed to enable stable beamtransport and acceleration. [...]
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OpenAccess [PUBDB-2019-03086] Book/Report/Dissertation / PhD Thesis
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Search for supersymmetry with tau leptons in the CMS experiment
[DESY-THESIS-2019-020]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 205 pp. () [10.3204/PUBDB-2019-03086] = Dissertation, Universität Hamburg, 2019  GO
This thesis is focused on the search for pair production of the supersymmetric $\tau$ lepton partners within the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC). The search is performed using the data collected at a center-of-mass-energy $\sqrt{s} = 13$ TeV with the CMS detector in the years 2016-2017.One of the most popular extensions of the Standard Model (SM) is supersymmetry (SUSY). [...]
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OpenAccess [PUBDB-2019-04354] Book/Report/Dissertation / PhD Thesis
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Ab initio radiation chemistry
[DESY-THESIS-2019-029]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 119 pp. () [10.3204/PUBDB-2019-04354] = Dissertation, Universität Hamburg, 2019  GO
The development of tools and techniques such as free-electron lasers (FELs) and pumpprobeexperiments has advanced the field of femtochemistry and made it possible tofollow the real-time dynamics of photo-excited molecular species on the femtosecondtime scale. Advances in femtochemistry experiments present new challenges and opportunitiesin the field of theoretical/computational femtochemistry for describing theultrafast molecular dynamics on the potential energy surfaces of electronically excitedmolecules.This thesis presents a series of theoretical studies on ultrafast dynamics of molecularsystems after excitation/ionization by laser pulses in the VUV to XUV regime, whichis highly relevant for pump-probe experiments [...]
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OpenAccess [PUBDB-2019-02359] Book/Report/Master Thesis
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Systematic Studies of a Cavity Quench Localization System
[DESY-THESIS-2019-010]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 120 pp. () [10.3204/PUBDB-2019-02359] = Masterarbeit, Universität Hamburg, 2019  GO
Several tools for quench localization at Superconducting Radio Frequency cavities exist. One of these techniques uses the excitation of temperature waves in liquid Helium below the lambda point. [...]
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OpenAccess [PUBDB-2019-02858] Book/Report/Dissertation / PhD Thesis
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Measurement and phenomenology of azimuthal correlations in high transverse momentum multi-jet topologies in CMS at the center-of-mass energy of 13 TeV
[DESY-THESIS-2019-013]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 287 pp. () [10.3204/PUBDB-2019-02858] = Dissertation, Universität Hamburg, 2019  GO
This work addresses the measurements and phenomenology of the azimuthal separation $\Delta\phi_{12}$ between the jets with the largest transverse momenta $(p_T)$ in multi-jet event topologies. The measurements are based on proton-proton collision data at the center-of-mass energy of 13 TeV recorded by the Compact Muon Solenoid (CMS) experiment in 2016, and correspond to an integrated luminosity of 35.9 fb$^{−1}$ [...]
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OpenAccess [PUBDB-2020-04779] Dissertation / PhD Thesis
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Observation of Very High Energy gamma-rays from Active Galactic Nuclei and characterization of their non-thermal emission mechanisms
Humboldt-Universität zu Berlin 197 pp. () [10.18452/20758] = Dissertation, Humboldt-Universität zu Berlin, 2019  GO
Das Hauptziel dieser Arbeit ist die Charakterisierung extrem starker Quellen, die höchstwahrscheinlich die kosmische Strahlung beschleunigen. In dieser Arbeit wurden VHE-Gammastrahlenbeobachtungen mit den MAGIC-Teleskopen verwendet, um die Eigenschaften von Blazaren zu untersuchen. [...]
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OpenAccess [PUBDB-2019-04176] Dissertation / PhD Thesis

Nuclear Cascades and Neutrino Production in the Sources of Ultra-High Energy Cosmic Ray Nuclei
Humboldt-Universität zu Berlin 165 pp. () [10.18452/20448] = Dissertation, Humboldt University, 2019  GO
Der Ursprung ultra-hochenergetischer kosmischer Strahlung (UHECRs) ist eine der wichtigsten offenen Fragen der Astrophysik. Gammastrahlenblitze (GRBs) galten als potentielle Quellen, da sie zu den energetischsten Ereignissen im Universum zählen. [...]
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OpenAccess [PUBDB-2020-03031] Book/Dissertation / PhD Thesis
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Measurement of Differential $\rho^0$ Photoproduction Cross-Sections at HERA
Heidelberg : Universitätsbibliothek Heidelberg, Dissertation 219 pp. () [10.3204/PUBDB-2020-03031] = Dissertation, Universitiy of Heidelberg, 2019  GO
Exclusive photoproduction ofρ0vector mesons is studied with the H1 detectorat HERA. A sample of over 900 000π+π−photoproduction events was collectedin the years 2006-2007 using the H1 Fast Track Trigger. [...]
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[PUBDB-2019-04309] Dissertation / PhD Thesis
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Exact Results for N=1 Theories of Class S_k
373 pp. () = Dissertation, University of Hamburg, 2019
A large class of four dimensional N=1 theories can be obtained by twisted compactification along a Riemann surface C of six dimensional theories with N=(1,0) supersymmetry. When the (1,0) theory is that of the theory on M5-branes on a transverse C_2/Z_k singularity the resulting four dimensional theories are said to be of class S_k . [...]
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[PUBDB-2020-02339] Dissertation / PhD Thesis

Detectors for functional medical imaging
172 pp. () = Dissertation, University of Hamburg, 2019
The work in this thesis deals with two functional medical imaging methods, i.e. positron emission tomography (PET) and X-ray uorescence imaging (XFI). [...]
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[PUBDB-2019-05662] Master Thesis
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Crystallization of n-alkanes in hydrophilic and hydrophobic nanopores
Hamburg : Hamburg University of Technology 83 pp. () = Masterarbeit, Hamburg University of Technology, 2019
In recent years, research has been carried out on soft matter in order to improve the abilityto control and manipulate its structural and thermodynamic properties at the nanoscale.Among these materials are normal alkanes (n-alkanes), a class of soft matter that hasalready been thoroughly researched in the bulk state. The aim of this master thesis isto investigate the behavior of n-alkanes under nanoconfinement. [...]
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OpenAccess [PUBDB-2020-01026] Dissertation / PhD Thesis
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Shape Resonances as a Probe of an Evolving Nuclear and Electronic Structure in Molecules
Freie Universität Berlin 176 pp. () [10.17169/REFUBIUM-1735] = Dissertation, FU Berlin, 2019  GO
Shape resonances are a ubiquitous phenomenon in electron–molecule scattering, in which the impinging electron is resonantly captured in a pseudo-bound state that is supported by the molecular potential. To study the electron scattering dynamics, we use time- and angle- resolved photoelectron spectroscopy here. [...]
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OpenAccess [PUBDB-2019-01768] Book/Report/Dissertation / PhD Thesis
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Flavour cosmology: Electroweak baryogenesis from varying Yukawas
[DESY-THESIS-2019-004]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 168 pp. () [10.3204/PUBDB-2019-01768] = Dissertation, Universität Hamburg, 2018  GO
Despite its outstanding phenomenological successes, the Standard Model of particle physicshas a number of severe shortcomings. In this thesis, I address some of the most strikingof these. [...]
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[PUBDB-2019-05597] Master Thesis
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Electronic properties of multilayered mixed metal oxide films of the elements In, Sn and Al
1-61 () = Masterarbeit, Technische Universitaet Darmstadt, 2019
The influence of the composition within multilayered heterostructure oxide semiconductors has a critical impact on the performance of thin-film transistor (TFT) devices. The heterostructures, comprising alternating polycrystalline indium oxide, tin(IV) oxide and aluminium oxide layers, are fabricated by a facile atomic layer deposition (ALD) process, enabling the tuning of its electrical properties by precisely controlling the thickness of the individual layers. [...]
OpenAccess [PUBDB-2020-01025] Dissertation / PhD Thesis
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Spektroskopické studium interakcí fokusovaného svazku rentgenového laseru s hmotou(The spectroscopy study of focused short-wavelength laser-matter interactions)
54 pp. () [10.3204/PUBDB-2020-01025] = Dissertation, Univerzita Karlova, Praha, 2019  GO
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[PUBDB-2019-05682] Bachelor Thesis

Synthesis and characterization of $Li_{(1+x)}Na_{(5-x)}Mo_{9}O_{30}$
1-46 () = Bachelorarbeit, Ludwig-Maximilians-Univ-München, 2019
OpenAccess [PUBDB-2019-02027] Book/Report/Dissertation / PhD Thesis
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Light-induced ultrafast tunneling dynamics of a many-electron system: from weak to strong fields
[DESY-THESIS-2019-006]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 176 pp. () [10.3204/PUBDB-2019-02027] = Dissertation, Universität Hamburg, 2019  GO
Photoionization is one of the most possible processes that can happen when light interacts with anelectronic system. This seemingly simple phenomenon has expanded into a rich playground thanksto the rapid development of ultraintense and ultrashort light-source technology.In this doctoral dissertation, we investigate photoionization dynamics that can be measured ortriggered by advanced light sources. [...]
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OpenAccess [PUBDB-2020-01027] Dissertation / PhD Thesis
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Ultrafast Photoionization Dynamics Studied with Coincidence Momentum Imaging Spectrometers
139 pp. () [10.3204/PUBDB-2020-01027] = Dissertation, Lund University, 2019  GO
The time scale of the dynamics in atoms and molecules varies from attoseconds (10-18) to picoseconds (10-12) depending on the size of the particles. To study such dynamics, ultrafast light pulses are needed to trigger and capture the reaction. [...]
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OpenAccess [PUBDB-2019-03009] Book/Report/Dissertation / PhD Thesis
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High-precision computation of observables in supersymmetric Yang–Mills theory
[DESY-THESIS-2019-019]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 149 pp. () [10.3204/PUBDB-2019-03009] = Dissertation, Universität Hamburg, 2019  GO
In this thesis we discuss modern mathematical tools for the perturbative analysis of supersymmetric Yang–Mills theories (abbreviated SYM). We apply contemporary and traditional computational techniques to two kind of problems. [...]
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[PUBDB-2019-05117] Dissertation / PhD Thesis
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Study On The Deformation Behavior Of Mg-Gd-Y(-Zn)-Zr Alloy Using In-Situ Synchrotron diffraction And Plasticity Modeling
151 pp. () = Dissertation, Harbin Institute of Technology, 2019
OpenAccess [PUBDB-2019-04319] Book/Dissertation / PhD Thesis
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Generation of Ultra-Short Electron Bunches and FEL Pulses, and Characterization of Their Longitudinal Properties at FLASH2
[DESY-THESIS-2019-022]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 141 pp. () [10.3204/PUBDB-2019-04319] = Dissertation, Universität Hamburg, 2019  GO
The free-electron laser in Hamburg (FLASH) is a soft X-ray user facility, delivering radiation for photon science since 2005. Since 2014, a second beam line for user operation, FLASH2, has been in operation. [...]
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OpenAccess [PUBDB-2020-01029] Dissertation / PhD Thesis
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Enhancing x-ray diffactive imaging and optical microscopy by use of intensity correlations
204 pp. () [10.3204/PUBDB-2020-01029] = Dissertation, FAU Erlangen-Nürnberg, 2019  GO
In this thesis we propose intensity correlation enhanced imaging techniques in two major areas of imaging with light. The first area is diffractive imaging. [...]
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OpenAccess [PUBDB-2019-04175] Dissertation / PhD Thesis

Blazars as Sources of Neutrinos and Ultra-high-energy Cosmic Rays
Humboldt-Universität zu Berlin 166 pp. () [10.18452/20610] = Dissertation, Humboldt University, 2019  GO
Der Ursprung ultra-hochenergetischer kosmischer Strahlung (UHECRs) ist immer noch unbekannt. Neutrinoteleskope wie IceCube messen einen Fluss hochenergetischer astrophysikalischer Neutrinos, dessen erwarteter Ursprung Wechselwirkungen kosmischer Strahlung (CR) ist. [...]
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OpenAccess [PUBDB-2020-04399] Dissertation / PhD Thesis
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Formulation and characterization of Room temperature Ferroelectric and antiferroelectric Liquid crystal mixtures
Siliguri : university of north bengal 201 pp. () [10.3204/PUBDB-2020-04399] = Dissertation, University of North Bengal, 2019  GO
Now-a-days displays have become a field of tremendous importance as they provide the best means for interface between man and machine. Large numbers of displays are presently available in the market, but among all these displays about 90% are controlled by the liquid crystal display (LCD) technology. [...]
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OpenAccess [PUBDB-2018-05902] Dissertation / PhD Thesis
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High-intracavity-power thin-disk laser for the alignment of molecules
137 pp. () [10.3204/PUBDB-2018-05902] = Dissertation, University of Hamburg, 2018  GO
The subject of this thesis was the development of a thin-disk laser with a continuous waveintracavity intensity of more than $10^{10} {W}{cm^{-2}}$ for the adiabatic alignment ofmolecules. In particular, this necessitates an intracavity power of more than 100 kW, aninternal focus with a radius of 20 µm, a well-defined and stable polarization, and benefitsfrom fundamental transverse mode operation. [...]
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[PUBDB-2019-03954] Master Thesis

Positron Acceleration with Beam-Driven Plasma Wakefield Accelerators
81 pp. () = Masterarbeit, University of Hamburg, 2019
The transport and acceleration of positron beams is a crucial challengeon the path towards plasma-based particle colliders. This work pro-poses to use a finite radius plasma in a plasma wakefield acceleratoras a way to reduce the restoring force acting on the plasma electrons,resulting in an elongation of their on-axis return point and, hence,creating a long, high-density electron filament. [...]
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OpenAccess [PUBDB-2019-04232] Dissertation / PhD Thesis

Structural studies of biotechnologically relevant enzymes
1-192 () [10.3204/PUBDB-2019-04232] = Dissertation, Freie Universität Berlin, 2018  GO
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OpenAccess [PUBDB-2020-02281] Dissertation / PhD Thesis

Jet activity in top-quark events at √s = 13 TeV using 3.2 fb-1 data collected by the ATLAS detector
Berlin : Humboldt-Universität zu Berlin 143 pp. () [10.18452/21053] = Dissertation, Humboldt-Universität zu Berlin, 2019  GO
In dieser Arbeit wird die Messung des normalisierten differentiellen Wechselwirkungsquerschnitts von Top Quark Produktionen mit zusätzlichen Jets präsentiert. Es werden Proton-Proton Kollisionsdaten des ATLAS Experiments am Large Hadron Collider bei einer Schwerpunktsenergie von 13 TeV mit einer Luminosität von 3.2 fb-1 verwendet. [...]
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[PUBDB-2019-02483] Dissertation / PhD Thesis
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Vibrational dynamics in semiconductor compounds and alloys
133 pp. () = Dissertation, Friedrich-Schiller-Universität Jena, 2019
OpenAccess [PUBDB-2019-04870] Book/Report/Dissertation / PhD Thesis
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Structure and Dynamics of Complex Liquids - The Phase Behaviour of Silica-PNIPAm Nanogels
[DESY-THESIS-2019-032]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 101 pp. () [10.3204/PUBDB-2019-04870] = Dissertation, Universität Hamburg, 2019  GO
In this thesis, the structure and dynamics of highly concentrated core-shell nanogel particlescomposed of a silica core and a poly(N-isoproylacrylamide) (PNIPAm) shell suspendedin water are studied. The particles were synthesised with dierent core-to-shell size ratiosand prepared at various concentrations with volume fractions e between approximately0:004 and 2. [...]
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[PUBDB-2019-05382] Master Thesis

Investigation of Ionic Diffusion in Alkali Borate Glasses by Impedance Spectroscopy and Atomic-Scale X-Ray Photon Correlation Spectroscopy
128 pp. () = Masterarbeit, University of Vienna, 2019
OpenAccess [PUBDB-2019-05675] Dissertation / PhD Thesis
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Reaction mechanism study of vanadium pentoxide as cathode material for beyond-Li energy storage via in operando techniques
Karlsruhe XVII, 114 S. () [10.5445/IR/1000095719] = Dissertation, Karlsruhe Institute of Technology (KIT), 2019  GO
Die vorliegende Arbeit beschäftigt sich mit der Untersuchung des Ionenspeichermechanismus in V2O5-Kathodenmaterial. Insbesondere wurde die Speicherung von Mg2+, K+ und Zn2+ mit in operando-Synchrotronbeugung und in operando Röntgenabsorptionsspektroskopie in Kombination mit ex situ Raman und Röntgenphotoelektronenspektroskopie (XPS) oder Transmissionselektronenmikroskopie (TEM) untersucht. [...]
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[PUBDB-2019-05681] Master Thesis

Synthesis of Chemical Gradient Multiferroic Crystals: The case of (In, Na)-doped $MnWO_{4}$ solid solutions
1-50 () = Masterarbeit, Ludwig-Maximilians-Univ. München, 2019
OpenAccess [PUBDB-2019-00540] Book/Report/Dissertation / PhD Thesis
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High repetition rate THz characterization at 4th generation X-Ray light sources
[DESY-THESIS-2019-001]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 266 pp. () [10.3204/PUBDB-2019-00540] = Dissertation, Universität Hamburg, 2018  GO
Within this work a wholesome approach to the characterization of FEL based THz radiationis made on the example of the THz radiation provided at the THz beamline at Flash thefree electron laser at DESY in Hamburg. A SRW based model of the THz generation froma free electron and the corresponding transport is developed and used to gain insight intothe complex intensity profile created by the interplay of the THz undulator and variousmagnetic edges. [...]
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[PUBDB-2019-04028] Bachelor Thesis

Measurement of the Tau Lepton polarisation in H --> Tau_lep Tau_had decays with the ATLAS Experiment at the CERN Large Hadron Collider
67 pages () = Bachelorarbeit, University of Leipzig, 2019
OpenAccess [PUBDB-2019-04183] Dissertation / PhD Thesis
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Crystal structures and vibrational properties of chalcogenides: the role of temperature and pressure
Jülich : Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag 150 p. () [10.3204/PUBDB-2019-04183] = Dissertation, RWTH Aachen, 2019  GO
Phase-change materials (e. g. [...]
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[PUBDB-2020-00684] Book/Dissertation / PhD Thesis

High-resolution grating-based phase-contrast imaging for synchrotron radiation sources
na () = Dissertation, University of Hamburg, 2019
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OpenAccess [PUBDB-2020-02288] Dissertation / PhD Thesis
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Anpassung und Optimierung des ptychographischen Modells für die quantitative Mikroskopie mit kohärenter Röntgenstrahlung und sichtbarem Laserlicht
Hamburg : Staats- und Universitätsbibliothek Hamburg 1-127 () [10.3204/PUBDB-2020-02288] = Dissertation, Universität Hamburg, 2019  GO
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OpenAccess [PUBDB-2019-02386] Dissertation / PhD Thesis
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Lithium- and oxygen-driven structural evolution in Co-free Li-Mn-rich oxides as cathodes for lithium ion batteries
Karlsruhe 121 pp. () [10.5445/IR/1000094410] = Dissertation, Karlsruhe Institute of Technology (KIT), 2019  GO
Nowadays, the lithium-rich layered 3d-transition-metal (TM) oxides (LLOs) are regarded as one of the most attractive cathode materials for next-generation lithium-ion batteries (LIBs), because they can exhibit a discharge capacity (approaching 300 mAh g$^{-1}$ at 0.1 C) much higher than that of the currently used materials(~ 180 mAh g$^{-1}$at 0.1 C). However, the formation mechanism of LLOs has not been fully understood on a fundamental level yet.One of the most interesting and still open questionsis aboutlithium and oxygen atoms are incorporatedinto the precursor’s crystal structure during the synthesisoffinal LLO products.Asystematic exploration of this subject was conducted in this PhD work. [...]
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OpenAccess [PUBDB-2020-02310] Dissertation / PhD Thesis
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Development and Characterization of a Laser-Induced Desorption Source for FEL Experiments
107 pages () [10.3204/PUBDB-2020-02310] = Dissertation, Universität Hamburg, 2019  GO
The recording of structural dynamics of individual large biomolecules requires efficient delivery of these biomolecules, which are usually thermally labile or non-volatile, to the X-ray or electron beam interaction point. Laser-induced acoustic desorption (LIAD) is a promising technique for gentle and efficient preparation of large intact neutral molecules into the gas-phase. [...]
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OpenAccess [PUBDB-2019-03220] Master Thesis

Magnet Characterization and Beam Profile Monitor Development for a Spectrometer at the ARES Linac
1-137 () [10.3204/PUBDB-2019-03220] = Masterarbeit, University of Hamburg, 2019  GO
The aim for size and cost reduction of particle accelerators has generated great interest in thedevelopment of novel acceleration techniques beyond the current radio frequency based technology.Those techniques are, for example, dielectric laser accelerators (DLAs) and have thepotential to reduce the size and costs, due to their high field gradients and small acceleration periods.DLAs consist of structures which are characterized by apertures in the µm range, leadingto electron-bunch charges in the pC range. At the SINBAD (Short and INnovative Bunches andAccelerators at DESY) facility at DESY, various techniques are foreseen to be investigated usingthe ARES (Accelerator Research Experiment at SINBAD) linear accelerator. [...]
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OpenAccess [PUBDB-2019-04144] Dissertation / PhD Thesis
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Molecular-Frame Angularly-Resolved Photoelectron Spectroscopy
Hamburg 1-196 () [10.3204/PUBDB-2019-04144] = Dissertation, Universität Hamburg, 2019  GO
One of the big technical and scientific challenges today is to accomplish the ultimate dreamof filming chemical reactions with atomic spatial and temporal resolution and recording themolecular movie. Important prerequisites toward this goal are, on the one hand, methodsto create cold, controlled molecular samples and, on the other hand, imaging techniquesthat combine the required spatial and temporal resolution. [...]
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OpenAccess [PUBDB-2019-03013] Book/Report/Dissertation / PhD Thesis
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From the Machine-Detector Interface to Electroweak Precision Measurements at the ILC — Beam-Gas Background, Beam Polarization and Triple Gauge Couplings
[DESY-THESIS-2019-018]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 330 pp. () [10.3204/PUBDB-2019-03013] = Dissertation, Universität Hamburg, 2019  GO
The International Linear Collider (ILC) is a planned electron-positron collider with a first stage at a center-of-mass energy of 250 GeV. The electron beam will be polarized to 80% and the positron beam to 30%. [...]
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[PUBDB-2020-00398] Master Thesis
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Modeling and search of γ-ray emission from Galactic colliding wind binaries
80 pp. () = Masterarbeit, Humboldt University of Berlin, 2019
Colliding wind binaries (CWBs) are unique acceleration sites of cosmicray particles and are known emitters of non-thermal photons. Out of morethan 40 known Galactic CWBs, two have been detected in γ-ray energies, ηCar and γ2 Vel. [...]
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[PUBDB-2019-04268] Master Thesis

Redox-isomeric transformations of substituted bis-phthalocyaninates of multivalent lanthanides at the phase interface
Moscow, Russia 1-79 () = Masterarbeit, Mendeleev University of Chemical Technology of Russia, 2019
The present work is devoted to the phenomenon of redox-isomerism in Langmuir monolayers of europium bis-tetra-15-crown-5-phthalocyaninate - (Eu[(15C5)4Pc]2). It is found that the intramolecular electron transfer from the electronic system of the phthalocyanine ligand to the 4f-orbital of europium atom occurs during the spreading of the Eu[(15C5)4Pc]2 solution in chloroform onto the air-water interface. [...]
OpenAccess [PUBDB-2019-02142] Book/Report/Dissertation / PhD Thesis
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Astrophysical Implications of Self-interacting Dark Matter
[DESY-THESIS-2019-008]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 127 pp. () [10.3204/PUBDB-2019-02142] = Dissertation, Universität Hamburg, 2019  GO
In this thesis we study the astrophysical implication of self-interacting dark matter. Observations on different scales suggest the existence of an additional form of matter which interacts gravitationally. [...]
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OpenAccess [PUBDB-2020-01028] Dissertation / PhD Thesis
; ; ; et al
Investigation of Ultrafast Molecular Dynamics via Covariance Mapping -A Tool for Intense XUV Light Sources
118 pp. () [10.3204/PUBDB-2020-01028] = Dissertation, Lund University, 2019  GO
The study of molecular dynamics involves observations of the motion of nuclei and electrons. While nuclear motion is usually on the picosecond or femtosecond timescale, attosecond precision is necessary to directly observe the motion of electrons. [...]
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OpenAccess [PUBDB-2020-02327] Dissertation / PhD Thesis
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Design and commissioning of an XUV and soft x-ray FEL pulse shaper
Hamburg : DESY 1-136 () [10.3204/PUBDB-2020-02327] = Dissertation, University of Hamburg, 2018  GO
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OpenAccess [PUBDB-2020-00397] Dissertation / PhD Thesis
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$\eta$ Carinae Detection and Characterisation of the First Colliding-Wind Binary in Very-High-Energy $\gamma$-rays with H.E.S.S.
Universität Potsdam 128 pp. () [10.25932/PUBLISHUP-42814] = Dissertation, University Potsdam, 2019  GO
The exceptional binary star Eta Carinae has been fascinating scientists and the people in the Southern hemisphere alike for hundreds of years. It survived an enormous outbreak, comparable to a supernova energy-wise, and for a short period became the brightest star of the night sky. [...]
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[PUBDB-2019-01513] Bachelor Thesis
; ; ; et al
Untersuchung der Magnetoptik für Harmonisches Seeding am Freien-Elektronen-Laser FLASH bei sFLASH
37 pp. () = Bachelorarbeit, University of Hamburg, 2019
OpenAccess [PUBDB-2019-01556] Book/Report/Dissertation / PhD Thesis
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Study of self-modulation of an electron beam in plasma
[DESY-THESIS-2019-003]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 142 pp. () [10.3204/PUBDB-2019-01556] = Dissertation, University of Hamburg, 2018  GO
The acceleration of electron beams in plasma wakefields driven by charged particlebeams is among the most promising candidates for future TeV-scale compact electronaccelerators. Currently available high energy proton beams that could serve as driverbeams in a plasma wakefeld accelerator (PWFA) are much longer than what is requiredfor efficient excitation of high-amplitude wakefields and thus for generating the desiredhigh acceleration gradients. [...]
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OpenAccess [PUBDB-2020-01023] Dissertation / PhD Thesis
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Two-Color Pump-Probe Experiments on O$_2$ and N$_2$ at the Free-Electron Laser in Hamburg
Heidelberg University Library 145 pp. () [10.11588/HEIDOK.00026702] = Dissertation, University of Heidelberg, 2019  GO
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[PUBDB-2020-02722] Book/Dissertation / PhD Thesis
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High-power high-repetition-rate 1-$\mu$M fiber laser system for strong-field physics and mid-infrared generation
The library of the University of Hamburg, High-power high-repetition-rate 1- µm fiber laser system for strong-field physics and mid-infrared generation 118 pp. () = Dissertation, University of Hamburg, 2019
Because of their ultrashort pulse duration and extremely high peak power, interest in ultrashort pulse lasers for strong-field experiments has been rapidly increasing over the past decades. After the invention of passively mode-locked lasers, further developments of ultrashort pulses in achieving ultrashort pulse duration, extremely high peak power and phase stabilization enable scientists to do frontier research such as bio-imaging, astronomical spectroscopy, solid-state high-harmonic generation, optical-field-driven electron emission from nanostructures, light-matter interaction in new materials, etc. [...]
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OpenAccess [PUBDB-2019-03713] Book/Report/Dissertation / PhD Thesis
; ; ; et al
Demonstrating High Transformer Ratio Beam-Driven Plasma Wakefield Acceleration
[DESY-THESIS-2019-024]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY THESIS 197 pp. () [10.3204/PUBDB-2019-03713] = Dissertation, Universität Hamburg, 2019  GO
In this work, plasma wakefield acceleration with high transformer ratios, i.e. highratios between acceleration of witness particles to deceleration of driver particles, is investigated experimentally.Particle-beam-driven plasma wakefield acceleration (PWFA) is one of the primecandidates for future compact accelerator technologies. [...]
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OpenAccess [PUBDB-2019-04190] Book/Report/Dissertation / PhD Thesis
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Characterization of Ultrashort Electron Bunches at the SINBAD-ARES Linac
[DESY-THESIS-2019-026]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 176 pp. () [10.3204/PUBDB-2019-04190] = Dissertation, Universität Hamburg, 2019  GO
The generation of ultrashort electron bunches is an active area of research in accelerator physics. A key application of such bunches is the injection into novel accelerators with high-frequency accelerating fields, such as laser-wakefield plasma accelerators or dielectric laser accelerators. [...]
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[PUBDB-2019-04110] Bachelor Thesis
; ; ; et al
Influence of Al-content on high temperature oxidation resistance of amorphous Al1+xY1B14
14-16 () = Bachelorarbeit, RWTH Aachen University, 2019
The amorphous material compound AlYB14 exhibits interesting properties due to anicosahedral B network but lacks oxidation resistance at high temperatures, as Boxide forms corrosive boric acid. Therefore, it was attempted to improve the stabilitywith a higher Al content up an Al/Y ratio of 2.4, as it is know to form a protective Aloxide layer preventing further oxidation. [...]
OpenAccess [PUBDB-2019-03861] Book/Report/Dissertation / PhD Thesis
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Acceleration and Phase Space Manipulation of Relativistic Electron Beams in Nano- and Micrometer-Scale Dielectric Structures
[DESY-THESIS-2019-025]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 215 pp. () [10.3204/PUBDB-2019-03861] = Dissertation, Universität Hamburg, 2019  GO
This thesis is about simulations, proof-of-principle experimental setups and first test experiments for new ultra-compact particle accelerators based on dielectric structures. Due to the high damage threshold of nano- and micrometer-scale dielectrics in the optical regime, accelerating fields on the order of GV/m can be achieved. [...]
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[PUBDB-2020-02259] Dissertation / PhD Thesis

Seismic noise analysis and isolation concepts for the ALPS II experiment at DESY
[ISSN 0174-1454]
Hannover : FACHRICHTUNG GEODÄSIE UND GEOINFORMATIK DER LEIBNIZ UNIVERSITÄT HANNOVER 1-213 () = Dissertation, Leibniz Universität Hannover, 2019
The ALPS II experiment at DESY is searching for new particles beyond the standardmodel of particle physics in a laboratory-based Light-Shining-through-a-Wall experiment,using high nesse optical resonators to reach the required sensitivity. The inputand output mirrors on the optical tables have extremely accurate positioning and alignmentrequirements, for which the analysis of ground vibration and seismic noise is essential.This thesis, therefore, focuses on this analysis, its evaluation, and the developmentof future seismic isolations for the ALPS II and JURA experiments.This work describes mechanical vibrations, seismic noise sources, seismic isolationprinciples, and also the seismic devices used to perform seismic noise analysis with theirmethods of measuring, calibrating, and analysing the acquired data. [...]
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OpenAccess [PUBDB-2019-02649] Book/Report/Dissertation / PhD Thesis
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On accelerated expansion in string theory
[DESY-THESIS-2019-012]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 211 pp. () [10.3204/PUBDB-2019-02649] = Dissertation, Universität Hamburg, 2019  GO
In the first part of this thesis we investigate the viability of a class of models for de Sitter (dS) vacua in string theory, due to Kachru, Kallosh, Linde and Trivedi (KKLT). We start by explaining why the success or failure of such models is sensitive to a large number of Planck suppressed operators, and collect circumstantial evidence that this UV sensitivity cannot be evaded with delicately engineered models such as the Kallosh-Linde (KL) racetrack due to a generic conflict with the weak gravity conjecture (WGC) for axions. [...]
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OpenAccess [PUBDB-2020-01024] Dissertation / PhD Thesis
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Untersuchung der Expansionsdynamik einzelner Xenoncluster induziert durch hochintensive Lichtpulse aus dem Infrarot- und weichen Röntgenbereich
Technische Universität Berlin 160 pp. () [10.14279/DEPOSITONCE-8518] = Dissertation, TU Berlin, 2019  GO
Diese Arbeit beschäftigt sich mit den grundlegenden Prozessen, die hochintensive und kurze Lichtpulse in Nanopartikeln auslösen. Als Modellsystem werden Xenoncluster im Größenbereich von 20 bis 90\,nm im Radius verwendet. [...]
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OpenAccess [PUBDB-2019-04260] Book/Report/Dissertation / PhD Thesis
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Double parton scattering: effects of colour
[DESY-THESIS-2019-027]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 154 pp. () [10.3204/PUBDB-2019-04260] = Dissertation, Universität Hamburg, 2019  GO
The underlying theme on which this Thesis develops is double parton scattering (DPS), which is a nucleon-nucleon scattering process in which two partons from each nucleon collide individually with one another to undergo two independent hard interactions. While these types of processes are usually suppressed with respect to theclassic single parton scattering (SPS), there are some circumstances in which DPS can give sizeable contributionsto the overall cross section, making DPS an important competitor to its SPS counterpart. [...]
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[PUBDB-2019-04467] Dissertation / PhD Thesis
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Sustainability of halogen bond motifs in the cocrystallization of amines, imines and their coordinaton compounds with perhalogenated aromates
130 pages : figures, tables () = Dissertation, University of Zagreb, 2019
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[PUBDB-2019-04198] Master Thesis
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A Novel Estimate of the Multijet background in a Search for Dark Matter Produced in Association with Top Quarks in the ATLAS experiment
62 pp. () = Masterarbeit, Universität Hamburg, 2019
The astronomical evidence for Dark Matter has sparked a large interest in Dark Matter searches at the LHC. Final states involving top quarks are interesting, because many models predict the Dark Matter to have larger couplings to more massive particles. [...]
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OpenAccess [PUBDB-2019-02856] Book/Report/Dissertation / PhD Thesis
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Associated Production of W + Charm in 13 TeV Proton-Proton Collisions Measured with CMS and Determination of the Strange Quark Content of the Proton
[DESY-THESIS-2019-014]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 178 pp. () [10.3204/PUBDB-2019-02856] = Dissertation, Universität Hamburg, 2019  GO
This thesis presents the measurement of associated production of a W$^±$ boson and a charm quark (W + c) in proton-proton collisions at a center-of-mass energy of 13 TeV. The data used in this analysis has been recorded by the CMS experiment at the CERN LHC and corresponds to an integrated luminosity of 35.7 fb$^{-1}$ . [...]
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OpenAccess [PUBDB-2019-05524] Book/Report/Dissertation / PhD Thesis
; ; ; et al
Investigation of low-energy photoelectron dynamics accelerated in terahertz light fields using a novel Velocity-Map-Imaging spectrometer
[DESY-THESIS-2019-033]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 155 pp. () [10.3204/PUBDB-2019-05524] = Dissertation, Universität Hamburg, 2019  GO
In this work, the dynamics of low-energy photoelectrons, generated by multiphoton ionization from near-infrared (NIR) laser pulses, in the presence of intense near single-cycle carrier-envelope phase stable Terahertz (THz) pulses, were experimentally investigated. For certain time delays between the NIR and THz pulses, a strong modulation of the photoelectron momentum distribution was observed and attributed to rescattering from the ionic core. [...]
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[PUBDB-2019-05688] Bachelor Thesis
; ; ; et al
Studien zur Entwicklung eines GridPix-basiertenRöntgenpolarimeters
69 pp. () = Bachelorarbeit, University of Bonn, 2019
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[PUBDB-2019-05680] Master Thesis

Synthesis and Characterisation of $Cu_{2-x}S$ Phases
1-82 () = Masterarbeit, Ludwig.Maximilians-Univ. München, 2019
OpenAccess [PUBDB-2019-02433] Master Thesis
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Pseudo Nambu-Goldstone Boson Inflation
108 pp. () [10.3204/PUBDB-2019-02433] = Masterarbeit, University of Hamburg, 2019  GO
We investigate an early Universe inflationary phase driven by a pseudo Nambu-Goldstone boson. The setup is not only naturally protected in the sense of t’Hooft, but such particles are also ubiquitous in quantum and string theories. [...]
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OpenAccess [PUBDB-2019-03351] Book/Dissertation / PhD Thesis
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Parametric Waveform Synthesis
[DESY-THESIS-2019-021]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 172 pp. () [10.3204/PUBDB-2019-03351] = Dissertation, Universität Hamburg, 2019  GO
The coherent synthesis of pulses from Optical Parametric Amplifiers (OPAs) offers the possibility to realize field-controlled electromagnetic waveforms with sub-cycle durations, widely scalable in energy and spectral bandwidth.Here we demonstrate a fully functional prototype of a mJ-level two channel parametric waveform synthesizer, which is ready to be upgraded to three channels. The synthesized field, whose bandwidth covers more than 2 octaves, from ~500 nm to ~2200 nm, can be compressed to a non-sinusoidal sub-cycle waveform close to the transform-limit.The long term stable operation of such a complex laser source is achieved, for the first time, by means of a sophisticated optical and mechanical design of the whole OPA system, along with targeted improvements made to the commercial pump laser.A new seeding scheme based on multiple supercontinua, further scalable to the mid-IR, leads to excellent phase stability among the different OPA channels and to a simplified dispersion management scheme.A detailed study, both theoretical and experimental, of the couplings among different pulse parameters during the parametric amplification, unveiled novel details of the Carrier-Envelope-Phase (CEP) stabilization process via OPA, and guided the design of the CEP-controlled seeding front-end.A simplified two-dimensional spectral shearing interferometry setup, where the ancillary pulses are obtained by spectral filtering the pump pulses, has been developed to easily characterize the spectral phase of the ultrabroadband pulses from each channel, overcoming the limitation of second-harmonic-based methods.Furthermore, ad-hoc nonlinear optical techniques have been deployed to observe the most relevant synthesis parameters such as the CEP of the seeding pulses and the relative phase among the different channels outputs. [...]
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OpenAccess [PUBDB-2019-03421] Master Thesis
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Confronting EFT with artificial neural networks in the quest for physics beyondthe Standard Model - Probing new paths for measuring dimension-6 operators in top-quark physics at LHC
Hamburg : University of Hamburg 64 pp. () [10.3204/PUBDB-2019-03421] = Masterarbeit, University of Hamburg, 2019  GO
As no sign of physics beyond the Standard Model has emerged at the Large Hadron Collider sofar, high precision measurements of particle properties and couplings become increasingly interesting.A commonly used language to interpret these measurements is effective field theory, inwhich higher-dimensional operators are added to the Standard Model. Traditional approachesmost commonly set constraints on anomalous couplings by employing and combining unfoldedmeasurements. [...]
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[PUBDB-2019-03871] Bachelor Thesis
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Präzise spektrale Analyse von Elektronenpaketen aus einemLaser Plasma Wakefield Beschleuniger
48 pp. () = Bachelorarbeit, University of Hamburg, 2019
This bachelor thesis aims to develop and optimize a method to analyse the energyof electron bunches accelerated by a laser-plasma wakefield accelerator (LPWA).An electron spectrometer is used, which consists of a magnet do disperse electronsof different energies, and a luminescence screen, on which the electrons are madevisible. Due to the high energy spread of electrons accelerated by a LPWA, awide screen is used, which can only be observed by using a fisheye lens. [...]
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OpenAccess [PUBDB-2019-03551] Book/Report/Dissertation / PhD Thesis
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Development of a compact hard X-ray split-and-delay line for studying ultrafast dynamics at free electron laser sources
[DESY-THESIS-2019-023]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 140 pp. () [10.3204/PUBDB-2019-03551] = Dissertation, Universität Hamburg, 2019  GO
The study of condensed matter dynamics on ultrafast timescales is one of the key topics in modern material science research. Hard X-ray free-electron laser sources with extreme peak brightness and ultra short pulses provide excellent conditions for studying ultrafast dynamics in the time domain by employing such techniques as X-ray pump-probe spectroscopy or X-ray photon correlation spectroscopy. [...]
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[PUBDB-2019-04031] Master Thesis
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Drell-Yan Production with Transverse Momentum Dependent Parton Densities
1-105 () = Masterarbeit, University of Hamburg, 2019
In this thesis, the Drell-Yan production is described in next-to-leading order (NLO)with transverse momentum dependent parton densities (TMDs). The NLO method MC@NLOis applied for the hard process calculation and is combined with TMDs obtained within theparton branching (PB) method (PB-TMDs). [...]
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OpenAccess [PUBDB-2019-04820] Book/Report/Dissertation / PhD Thesis
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Massive two- and three-loop calculations in QED and QCD
[DESY-THESIS-2019-031]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 294 pp. () [10.3204/PUBDB-2019-04820] = Dissertation, TU Dortmund, 2019  GO
This thesis is devoted to the study of mass effects in higher order radiative corrections within QED and QCD. The first part of the thesis deals with the process of deep-inelastic scattering. [...]
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[PUBDB-2019-04127] Master Thesis
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Combining resonant inelastic X-ray scattering with micrometer resolution to image electronic properties of quantum materials
59 pages () = Masterarbeit, University of Hamburg, 2019
This thesis presents developments and results of an experimental setup which combines soft X-ray spectroscopy methods for electronic structure analysis and imaging capabilities with the goal to gain detailed understanding of quantum materials, which exhibit spatial electronic inhomogeneities. The setup features a combination of two Fresnel zone plates which are about 1mm long and sub-μm wide: Firstly, a linear illumination zone plate creates a vertical X-ray focus line on the sample. [...]
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OpenAccess [PUBDB-2019-04814] Book/Report/Dissertation / PhD Thesis
; ; ; et al
Silicon Pixel Detectors - Performance after Irradiation and Application in Three-dimensional Imaging
[DESY-THESIS-2019-030]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 251 pp. () [10.3204/PUBDB-2019-04814] = Dissertation, Universität Hamburg, 2019  GO
This dissertation addresses two applications of silicon pixel detectors as tracking devices, namely the applications in high energy physics experiments and in a novel tomographic technique termed material budget imaging.For current and future experiments in high energy physics, one of the main challenges for the development of silicon detectors is the immense radiation fluence received over the years of operation.In this thesis, the performance of silicon pixel detectors for the tracking detector of the Compact Muon Solenoid (CMS) experiment is investigated for fluences of up to $\Phi_{eq}= 1.39\times10^{15}$n/cm$^2$ close to the expected lifetime fluence of the innermost layer of the barrel pixel detector. Measurements conducted at the DESY II Test Beam Facility show, that the maximum collected charge is reduced significantly by the high radiation fluences, but that an efficiency of above 99 % can be maintained when applying reasonable bias voltages.The voltage required to fully deplete the sensor rises up to around 600 V.The effective Lorentz angle of unirradiated detector modules and a module irradiated to a fluence of $\Phi_{eq}= 4\times10^{14}$n/cm$^2$ was determined for various bias voltages using a 1.34 T magnetic field.The findings imply that the high bias voltages required for an efficient operation of radiation damaged pixel detectors will impair the resolution of the detector modules significantly.The second application investigated is the use of silicon pixel detectors for an imaging technique aiming to reconstruct the three-dimensional material distribution of arbitrary samples.Using the high-resolution EUDET-type Beam Telescopes available at the DESY II Test Beam Facility to measure the scattering angle of relativistic particles when traversing a sample allows for the determination of its projected material budget in two dimensions.A rotation of the sample and an inverse Radon transform facilitates a reconstruction of the sample's internal structure.Simulations of this technique are presented as well as the first acquired three-dimensional material budget images.The simulations and an evaluation of the underlying two-dimensional images indicate a possible resolution of this method of less than 20 $\mu$m at a sufficiently high contrast-to-noise ratio.The potential and the limits of material budget imaging as well as possible future applications and developments are discussed..
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OpenAccess [PUBDB-2020-02956] Bachelor Thesis
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Setup and characterisation of an autocorrelator for UV laser pulses
36 pp. () [10.3204/PUBDB-2020-02956] = Bachelorarbeit, university of hamburg, 2019  GO
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OpenAccess [PUBDB-2019-01182] Book/Report/Dissertation / PhD Thesis
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Search for high mass higgs bosons in the final state with $b$-quarks with the CMS 2016 data
[DESY-THESIS-2019-002]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 216 pp. () [10.3204/PUBDB-2019-01182] = Dissertation, Universität Hamburg, 2019  GO
A search for high mass Higgs bosons produced in association with at least one $b$-quark and decaying into a pair of $b$-quarks using the LHC Run 2 data collected by the CMS detector is presented. The corresponding data sample was accumulated during the proton-proton collisions in 2016 at a centre-of-mass energy of $\sqrt{s} = 13$ TeV, corresponding to an integrated luminosity of 35.7 fb$^{-1}$.An extended Higgs sector containing high mass Higgs states is predicted by many theories beyond the Standard Model, such as a general two Higgs doublet model (2HDM) and its realization in the Minimal Supersymmetric extension of the Standard Model (MSSM).In many scenarios within these models Higgs couplings to $b$-quarks are significantly enhanced and therefore the final state exploited in this work is of particular interest.From the experimental point of view this final state leads to at least three highly energetic $b$-jets in the event, of which the two with the highest transverse momentum, are assumed to originate from the Higgs boson decay and another one comes from the associated production mechanism. [...]
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OpenAccess [PUBDB-2019-01602] Dissertation / PhD Thesis
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Higher-Order-Mode-based Beam Phase and Beam Position Measurements in Superconducting Accelerating Cavities at the European XFEL
183 pp. () [10.3204/PUBDB-2019-01602] = Dissertation, University of Manchester, 2017  GO
Instrumentation of higher order modes (HOMs) excited in accelerating cavities for beam phase and position inference provides a noninvasive and economical beam diagnostic. The principles and techniques for this purpose are investigated for TESLA (TeV Energy Superconducting Linear Accelerator) cavities at the injector part of the newly built European XFEL and at FLASH, two free electron laser facilities based on the TESLA technology.I have designed and instrumented unconventional beam phase monitors based on monopole modes in TESLA cavities and demonstrated a routine resolution of 0.1° with a broadband setup [...]
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OpenAccess [PUBDB-2019-05119] Dissertation / PhD Thesis

Investigation of the pH and temperature dependent properties of tetramyristoyl cardiolipin and its behavior in model membranes
1 - 175 () [10.3204/PUBDB-2019-05119] = Dissertation, University of Greifswald, 2019  GO
The goal of this thesis was to characterize the properties of tetramyristoyl cardiolipin (TMCL) and several environmental influences on it. This included investigating the pH and temperature dependency of TMCL as well as the influences of ROS on TMCL and exam-ining the lipid-protein interactions between TMCL and cytc. [...]
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[PUBDB-2019-03268] Bachelor Thesis
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Plasmaquellencharakterisierung für Laser- und strahlgetriebene Wakefieldbeschleuniger
Hamburg iii, 30 Seiten, 1 CD-ROM : Illustrationen, Diagramme () = Universität Hamburg, Bachelorarbeit, 2019
Plasma wakefield accelerators are able to accelerate charged particles by using the electric fieldof the free electrons within a plasma. The electric field is about one magnitude bigger thanin conventional accelerators. [...]
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OpenAccess [PUBDB-2019-03677] Dissertation / PhD Thesis
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Precision measurement of the top quark pair production cross section at $\sqrt{s}$ = 13 TeV with the CMS detector
1 - 138 () [10.3204/PUBDB-2019-03677] = Dissertation, Hamburg University, 2018  GO
This work presents several measurements of the inclusive top pair production cross sectionat a center of mass energy of√s = 13 TeV with the CMS detector. The cross section ismeasured using several data sets collected by the CMS detector in 2015 and 2016. [...]
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[PUBDB-2019-05452] Master Thesis
; ; ; et al
Sub-Cycle Nonlinear PulsePropagation
86 pp. () = Masterarbeit, University of Hamburg, 2019
Isolated few-cycle pulses are used as driving fields for high-harmonicgeneration (HHG) and in pump-probe experiments. In this work awave equation solver was developed, describing the propagation ofpulses with few- to sub-cycle duration in a nonlinear gas medium.The 1-D numerical model is used to investigate the behaviour insidehollow-core fibers. [...]
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OpenAccess [PUBDB-2019-02383] Dissertation / PhD Thesis
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Microfluidic Sample Environments for Time-resolved Macromolecular Structure Formation Studies
Hamburg 186 pp. () [10.3204/PUBDB-2019-02383] = Dissertation, University of Hamburg, 2019  GO
This thesis deals with the polymerization-induced self-assembly (PISA) of amphiphilic blockcopolymer nano-objects, which were synthesized using a controlled radical polymerization(CRP) method, in particular, the reversible addition-fragmentation chain-transfer (RAFT)aqueous polymerization in the presence of a poly(N,N-dimethylacrylamide) stabilizer agent(macro RAFT agent). Besides the use of N-isopropylacrylamide (NIPAm) as core-formingblock for thermo-responsive nanoparticle, the aqueous dispersion polymerization of 2-methoxyethyl acrylate (MEA) was pursued as a model to study hydrophilic-hydrophobic phasetransitions: as a monomer, MEA is water-soluble. [...]
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OpenAccess [PUBDB-2020-02957] Dissertation / PhD Thesis

Fabrication of Novel Microfluidic Devices for Investigating Ultrafast Structural Dynamics
151 pp. () [10.3204/PUBDB-2020-02957] = Dissertation, University of Hamburg, 2019  GO
The recent developments of several X-ray synchrotrons and (ultrabright) XFEL light sources with increasingly narrow and brilliant beams have allowed facilities to reduce both sample volume and data acquisition time. Moreover, this has created new opportunities for investigating versatile sample conditions while simultaneously increasing demands in terms of sample preparation. [...]
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OpenAccess [PUBDB-2020-02967] Dissertation / PhD Thesis
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Fabrication of Novel Microfluidic Devicesfor Investigating Ultrafast Structural Dynamics
151 pp. () [10.3204/PUBDB-2020-02967] = Dissertation, University of Hamburg, 2019  GO
The recent developments of several X-ray synchrotrons and (ultrabright) XFEL light sources with increasingly narrow and brilliant beams have allowed facilities to reduce both sample volume and data acquisition time. Moreover, this has created new opportunities for investigating versatile sample conditions while simultaneously increasing demands in terms of sample preparation. [...]
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OpenAccess [PUBDB-2019-05614] Dissertation / PhD Thesis

Cross-section measurement of top quark pair production with additional b-jets in the eμ channel at √ s = 13 TeV with the ATLAS detector
Humboldt-Universität zu Berlin 199 pages () [10.18452/20757] = Dissertation, Humboldt-Universität zu Berlin, 2019  GO
Diese Doktorarbeit behandelt die Messung des Wirkungsquerschnittes der Paarbildung von Top-Quarks mit zusätzlichen B-Jets (Teilchenschauer aus der Fragmentierung von B-Quarks) in Proton-Proton-Kollisionen bei einer Schwerpunktsenergie von √s =13 TeV am Large Hadron Collider. Der Datensatz wurde 2015/16 mit dem ATLAS-Detektor aufgezeichnet und entspricht einer integrierten Luminosität von 36,1/fb. [...]
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OpenAccess [PUBDB-2019-03157] Dissertation / PhD Thesis
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The magnetic properties of ultrathin Cobalt multilayers symmetrically and antisymmetrically sandwiched between layers of platinum and iridium
223 pp. () [10.3204/PUBDB-2019-03157] = Dissertation, Universität Hamburg, 2018  GO
This thesis deals with a systematic study of magnetic properties, i.e. saturation magnetization, exchange stiffness, anisotropy, interlayer exchange coupling, and average domains size, of ultrathin Co-based multilayer systems. [...]
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[PUBDB-2019-03729] Bachelor Thesis
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In-situ Überwachung von Stimuli-responsiven photoaktiven Nanomaterialien
51 pp. () = Bachelorarbeit, University of Kiel, 2019
OpenAccess [PUBDB-2019-03623] Bachelor Thesis
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Simulation of artificial and biological nanoparticles’ trajectories in hybrid force-fields
Hamburg 79 pp. () [10.3204/PUBDB-2019-03623] = Bachelorarbeit, Universität Hamburg, 2019  GO
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OpenAccess [PUBDB-2019-02167] Book/Report/Dissertation / PhD Thesis
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Tau Lepton: As a Tool for Hunting Standard Model and Beyond Standard Model Higgs
[DESY-THESIS-2019-009]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 189 pp. () [10.3204/PUBDB-2019-02167] = Dissertation, Universität Hamburg, 2019  GO
This thesis presents a study of the Standard Model (SM) Higgs boson in the decay channelof ! eμ, as well as a search for neutral Minimal Supersymmetric Standard Model (MSSM)Higgs boson in the same decay channel, using data corresponding to an integrated luminosityof 35.9 fb−1 in proton-proton collisions with a center-of-mass energy of 13 TeV, collected bythe CMS detector at the Large Hadron Collider. The results of eμ channel in both analysesare combined with other channels of Higgs to decay: eh, μh and hh.An observation of the SM Higgs boson to is established with a significance of 4.9 standarddeviations, to be compared to an expected significance of 4.7 standard deviations [...]
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OpenAccess [PUBDB-2019-03809] Book/Report/Dissertation / PhD Thesis
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Exploring Models of Electroweak Symmetry Breaking at the LHC and Beyond
[DESY-THESIS-2019-028]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 184 pp. () [10.3204/PUBDB-2019-03809] = Dissertation, Universität Hamburg, 2019  GO
We explore different scenarios of electroweak symmetry breaking by studying the phenomenology of several models that extend the scalar sector of the Standard Model (SM). We investigate resonant multiscalar production in a singlet extension of the SM. [...]
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