Ph.D. Theses

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2022-04-29
10:38
OpenAccess [PUBDB-2022-01931] Book/Dissertation / PhD Thesis
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The silicon strip detector of the ATLAS Inner Tracker: from individual sensing units to multi-module petal structures
[DESY-THESIS-2022-008]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 153 pp. () [10.3204/PUBDB-2022-01931] = Dissertation, University of Dortmund, 2022  GO
Nowadays particle detector technology is taking big steps forwards and new devices dedicated to particle physics show very high performance. Particularly the semi-conductor detectors have advanced significantly and are used for tracking purposes in the A Toroidal LHC ApparatuS (ATLAS) experiment at CERN thanks to their excellent spacial resolution: the compact size of the silicon and its high granularity allow to reach a precision measurement of few tens of microns.This thesis is focused on the upgrade of the ATLAS tracking detector required for the High Luminosity Large Hadron Collider (HL-LHC), starting in 2027. [...]
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2022-04-12
23:07
OpenAccess [PUBDB-2022-01837] Dissertation / PhD Thesis
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3D Multimodal X-ray Imaging of a Microchip: Correlating Structure, Composition and Orientation at the Nanoscale
Hamburg : Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky 145 pages: illustrations, diagrams () [10.3204/PUBDB-2022-01837] = Dissertation, University of Hamburg, 2021  GO
With the fast technological developments of our time often new possibilities arise to gain a deeperscientific understanding of complex processes, may these be of biological, chemical or physicalnature, and materials. In natural sciences, X-ray and electron microscopy is indispensable tohelp uncovering these scientific backgrounds. [...]
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2022-04-12
12:57
OpenAccess [PUBDB-2022-01816] Dissertation / PhD Thesis
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Search for Dark Matter in Invisible Higgs Boson Decays with the ATLAS Detector at the LHC
235 pp. () [10.3204/PUBDB-2022-01816] = Dissertation, University of Hamburg, 2021  GO
The nature of dark matter is one of the biggest open questions in modern physics. While dark matter accountsfor roughly 25% of the energy density in the Universe, its particle nature remains unknown so far. [...]
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2022-04-08
11:06
Embargoed OpenAccess [PUBDB-2022-01774] Dissertation / PhD Thesis
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Tailoring Heat Treatments for Metals Processed by Laser Powder Bed Fusion
171-200 () [10.3204/PUBDB-2022-01774] = Dissertation, KU Leuven, 2022  GO
The project's main goal is to design tailored post-process heat treatments for four LPBF high-end alloys (AlSi10Mg, AlSi7Mg, Ti6Al4V ELI, Inconel 718) that are widely used in the Aerospace, Healthcare, and Energy industry. The precondition for a successful design of the tailored heat treatment is the guarantee that mechanical property standards for the Aerospace, Healthcare, and Energy industry are met at any time. [...]
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2022-04-07
11:45
[PUBDB-2022-01760] Dissertation / PhD Thesis

Molecular modeling at high X-ray intensity: Developments, applications and challenges
1-130 () = Dissertation, Universität Hamburg, 2021  GO
The advent of X-ray free-electron lasers (XFELs) over the past decade, providing ultraintense femtosecond X-ray pulses, offers novel opportunities formolecular structure investigations. By now, most of the established approachesrevolve around diffractive imaging schemes with crystalline samples, whereelectronic and nuclear radiation damage, caused by the X-rays, must be avoidedto achieve the highest possible spatial resolution. [...]
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2022-03-31
23:24
OpenAccess [PUBDB-2022-01695] Book/Dissertation / PhD Thesis
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Near-surface Iron Cation Transport in Magnetite
[DESY-THESIS-2022-007]
Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 230 pp. () [10.3204/PUBDB-2022-01695] = Dissertation, Universität Hamburg, 2021  GO
Magnetite ($\text{Fe}_3\text{O}_4$), one of the first known magnetic materials, has multiple applications as for example as a catalyst or catalyst component. Magnetite nanoparticles are used as contrast agents in medicine or building blocks in novel hierarchical materials with outstanding mechanical properties. [...]
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2022-03-29
15:11
OpenAccess [PUBDB-2022-01666] Book/Dissertation / PhD Thesis
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Measurement of Total and Differential Charm Cross Sections at 7 TeV with the CMS Detector
[DESY-THESIS-2022-006]
Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 128 pp. () [10.3204/PUBDB-2022-01666] = Dissertation, Universität of Hamburg, 2022  GO
This thesis presents the total charm cross section measurement in the full kinematic phase space of pp collisions at the LHC. It was performed using open data (2010) from the CMSexperiment at a center-of-mass energy of 7 TeV due to its special low p$_{\mathrm{T}}$ tracking. [...]
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2022-03-22
10:12
[PUBDB-2022-01592] Dissertation / PhD Thesis
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Search for top quark-antiquark pair resonances with the ATLAS experiment
211 pp. () = Dissertation, Humboldt-Universität zu Berlin, 2021  GO
AbstractA search for new heavy particles that decay into top quark-antiquark pairs ispresented using an integrated luminosity of 20.3 fb−1 of proton-proton collision datarecorded at a centre-of-mass energy of √s = 8 TeV with the ATLAS experiment atthe Large Hadron Collider. The analysis considers events with exactly one chargedlepton, missing transverse momentum and jets in the final state. [...]
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2022-03-09
16:09
OpenAccess [PUBDB-2022-01470] Book/Dissertation / PhD Thesis
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Study of nitrogen-enriched niobium and its influence on the performance on superconducting RF cavities
[DESY-THESIS-2022-005]
Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 127 pp. () [10.3204/PUBDB-2022-01470] = Dissertation, Universität Hamburg, 2022  GO
The structure and composition of niobium, the current state-of-the-art material for superconductingradio-frequency (SRF) cavities, are of extreme importance in understandingthe operation behaviour of cavities. In recent years, the use of nitrogen to improve this behaviourhas been widely studied. [...]
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2022-03-07
07:45
[PUBDB-2022-01419] Dissertation / PhD Thesis
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Model Studies of Catalytic Processes at the Solid/Liquid Interface
Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) 170 pp. () = Dissertation, Friedrich-Alexander-University Erlangen-Nuremberg, 2021  GO
This thesis focuses on the fundamental understanding of different catalytic reactions at the interface between a solid catalyst and a liquid reactant phase. To this end, both in situ and operando experiments, monitored by synchrotron X-ray diffraction techniques as well as infrared spectroscopy based surface science model studies, were performed. [...]
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