Ph.D. Theses

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OpenAccess [PUBDB-2017-01934] Book/Report/Dissertation / PhD Thesis
Large-scale laser-microwave synchronization for attosecond photon science facilities
DESY-THESIS 134 pp., (2017) [10.3204/PUBDB-2017-01934]  GO
Low-noise transfer of time and frequency standards over large distances provides high temporal resolution for ambitious scientific explorations such as sensitive imaging of astronomical objects using multi-telescope arrays, comparison of distant optical clocks or gravitational-wave detection using large laser interferometers. In particular, rapidly expanding photon science facilities such as X-ray free-electron lasers (FELs) and attoscience centers have the most challenging synchronization requirements of sub-fs timing precision to generate ultrashort X-ray pulses for the benefit of creating super-microscopes with sub-atomic spatiotemporal resolution. [...]
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OpenAccess [PUBDB-2017-01744] Book/Report/Dissertation / PhD Thesis
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Search for Supersymmetric Top-Quark Partners Using Support Vector Machines and Upgrade of the Hadron Calorimeter Front-End Readout Control System at CMS
DESY-THESIS 171 pp., (2017) [10.3204/PUBDB-2017-01744]  GO
In this thesis a search for direct pair production of supersymmetric top-quark partners as well as work on the upgrade of the front-end readout controller of the Hadron Calorimeter (HCAL) of the Compact Muon Solenoid (CMS) experiment are presented. The most appealing extension of the Standard Model (SM) is supersymmetry (SUSY), relating the integer spin (bosons) and half-integer spin elementary particles (fermions). [...]
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OpenAccess [PUBDB-2017-01534] Dissertation / PhD Thesis

The thermal stability of bulk nanocrystalline steels
315 pp., (2016) [10.17863/CAM.7026]  GO
Nanocrystalline bainite, commonly known as “superbainite”, is a novel class of steel that utilises careful alloy design to reduce the bainite transformation temperature to below 300℃. This results in grains that are tens of nanometres in width, which make steel strong and tough. [...]
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OpenAccess [PUBDB-2017-01532] Book/Report/Dissertation / PhD Thesis
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Few-cycle High Energy Mid-Infrared Pulse from Ho:YLF Laser
DESY-THESIS 188 pp., (2017) [10.3204/PUBDB-2017-01532]  GO
Over the past decade, development of high-energy ultrafast laser sources hasled to important breakthroughs in attoscience and strong-field physicsstudy of atoms and molecules. Coherent pulse synthesis of a few-cyclehigh-energy laser pulse is a promising tool to generate isolated attosecond pulsesvia high harmonics generation (HHG). [...]
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[PUBDB-2017-01530] Dissertation / PhD Thesis
Der Einfluss der Koordination von Spurenelementen in silikatischen und aluminosilikatischen Schmelzen auf Elementverteilungsprozesse in magmatischen Systemen.
138 pp., (2016)
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OpenAccess [PUBDB-2017-01522] Book/Report/Dissertation / PhD Thesis
Operando X-ray Investigation of Solid Oxide Fuel Cell Model Electrodes
DESY-THESIS 120 pp., (2017) [10.3204/PUBDB-2017-01522]  GO
A detailed study of three solid oxide fuel cells (SOFCs) related model systems is presented in this work with the aim of the better understanding of the structural changes in cell components associated with their operation. The first model system is an La$_{0.6}$Sr$_{0.4}$CoO$_{3−δ}$ (LSC) on yttria-stabilized zirconia (YSZ). [...]
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OpenAccess [PUBDB-2017-01392] Book/Report/Dissertation / PhD Thesis
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Characterisation of the ATLAS ITK Strips Front-End Chip and Development of EUDAQ 2.0 for the EUDET-Style Pixel Telescopes
DESY-THESIS 138 pp., (2017) [10.3204/PUBDB-2017-01392]  GO
As part of the ATLAS phase-II upgrade a new, all-silicon tracker will be built. The newtracker will consist of silicon pixel sensors and silicon microstrip sensors. [...]
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OpenAccess [PUBDB-2017-01369] Book/Report/Dissertation / PhD Thesis
Atomic structure of graphene supported heterogeneous model catalysts
DESY-THESIS 266 pp., (2017) [10.3204/PUBDB-2017-01369]  GO
Graphene on Ir(111) forms a moire structure with well defined nucleation centres. Therefore it can be utilized to create hexagonal metal cluster lattices with outstanding structural quality. [...]
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OpenAccess [PUBDB-2017-01266] Book/Report/Dissertation / PhD Thesis
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Characterization of nanowires by coherent x-ray diffractive imaging and ptychography
DESY-THESIS 149 pp., (2017) [10.3204/PUBDB-2017-01266]  GO
Imaging techniques are of paramount importance for our understanding of the universe. From galaxies and stars explored by huge telescopes down to micro and nanostructures studied by microscopes, imaging systems provide invaluable scientific information. [...]
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OpenAccess [PUBDB-2017-00976] Book/Report/Dissertation / PhD Thesis

Jet Production and Parton Dynamics in Deep Inelastic Scattering
141 pp., (2001) [10.3204/PUBDB-2017-00976]  GO
Hard QCD processes have been studied by measuring the di-jet event rate for deep inelastic scattering in the kinematic range 5<$Q^{2}<100 GeV^{2}$ and $10^{-4}<x<10^{-2}$. The jets were reconstructed using the cone algorithm in the hadronic center-of-mass frame in which the transverse momentum of the jets were required to be greater than 5 GeV. [...]
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