Ph.D. Theses

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2018-06-15
11:48
OpenAccess [PUBDB-2018-02286] Dissertation / PhD Thesis
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Integrated Waveguide Devices for Mode-Locked Lasers
, 134 pp. () [10.3204/PUBDB-2018-02286] = Dissertation, Massachusetts Institute of Technology, 2018  GO
Mode-locked lasers can provide a stable source of optical pulses with intrinsically low timing jitter, and as such have a broad range of important applications, both as sources of low-noise microwave signals and as the key enabling technology for optical frequency combs. Integrating such laser systems onto a chip using silicon photonics will dramatically reduce size and cost, thus increasing the accessibility of this technology for widespread deployment. [...]
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2018-06-12
09:04
OpenAccess [PUBDB-2018-02247] Book/Report/Dissertation / PhD Thesis
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Identification and Control of the Laser-based SynchronizationSystem for the European X-ray Free Electron Laser
[DESY-THESIS-2018-018]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS , 164 pp. () [10.3204/PUBDB-2018-02247] = Dissertation, Technische Universität Hamburg, 2017  GO
The European X-ray Free-Electron Laser is currently under construction at theDeutsches ElektronenSynchrotron in Hamburg, Germany. This linear accelerator, with a length of 3.4 km,will generate extremely intense and short X-ray laser light pulses with a duration in the femtosecondrange and wavelengths down to 0.05 nm. [...]
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2018-06-11
16:51
OpenAccess [PUBDB-2018-02246] Book/Report/Dissertation / PhD Thesis
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On generalisations of the AGT correspondence for non-Lagrangian theories of class S
[DESY-THESIS-2018-019]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS , 254 pages : illustrations, diagrams () [10.3204/PUBDB-2018-02246] = Dissertation, Universität Hamburg, 2018  GO
Non-perturbative aspects of N = 2 supersymmetric field theories of class S are deeply encoded in the algebra of functions on moduli spaces M-flat of flat SL(N)-connections on Riemann surfaces. Expectation values of Wilson and ’t Hooft supersymmetric line operators are related to holonomies of flat connections, while expectation values of line operators in the low energy effective theory are related to Fock-Goncharov coordinates on M-flat. [...]
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2018-06-11
13:56
OpenAccess [PUBDB-2018-02245] Book/Report/Dissertation / PhD Thesis
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Optimizing the design of the Final-Focus region for the International Linear Collider
[DESY-THESIS-2018-017; ETP-KA/2018-13]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS , 176 pp. () [10.5445/IR/1000083323] = Dissertation, Karlsruhe Institute of Technology (KIT), 2018  GO
The International Linear Collider (ILC) is a proposed linear electron positron collider with a center-of-mass energy of 250 GeV in its first stage. After the discovery of the Higgs boson at the Large Hadron Collider (LHC) at CERN in 2012, the physics goals of the ILC include the measurements of the Higgs boson properties and its interactions, but also measurements of the top quark and searches beyond the Standard Model are part of the ILC program in the different ILC stages. [...]
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2018-06-11
12:15
OpenAccess [PUBDB-2018-02244] Book/Report/Dissertation / PhD Thesis
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Precision measurement of the inclusive b jet production in proton proton collisions with the CMS experiment at the LHC at $\sqrt s = 13\, \text{TeV}$
[DESY-THESIS-2018-016; CMS TS-2018/005]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS , 334 pages : illustrations, figures () [10.3204/PUBDB-2018-02244] = Dissertation, Universität Hamburg, 2018  GO
A measurement of the double differential cross section for inclusive $b$ jet production in proton-proton collisions as well as fraction of $b$ jets in the inclusive jet production is presented as a function of the transverse momentum $p_T$ and the absolute rapidity $|y|$.The data samples were collected in the CMS experiment at LHC during 2016 and correspond to an integrated luminosity of $35.2\,\text{fb}^{-1}$ at a centre-of-mass energy of $13\,\text{TeV}$.The jets are selected with $p_T > 74\,\text{GeV}$ and $|y| < 2.4$; the $b$ jets must contain a $B$ hadron.The measurement has significant statistics up to $p_T \sim \mathcal{O}(\text{TeV})$.Advanced methods of unfolding are performed to extract the signal.It is found that fixed-order calculations with underlying event describe the measurement well..
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2018-05-09
14:08
OpenAccess [PUBDB-2018-01937] Book/Report/Dissertation / PhD Thesis
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Generation of ultra-short low-charge electron bunches for single-spike SASE radiation at the Free-Electron Laser in Hamburg
[DESY-THESIS-2018-015]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS , 144 pp. () [10.3204/PUBDB-2018-01937] = Dissertation, Universität Hamburg, 2017  GO
High-gain Free-Electron Lasers (FEL) constitute a powerful source of intense, short radiation pulses in the XUV and X-ray range that are used in a wide variety of research fields. They typically work in the Self-Amplified Spontaneous Emission (SASE) Mode. [...]
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2018-04-27
19:30
OpenAccess [PUBDB-2018-01870] Book/Report/Dissertation / PhD Thesis
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Studies of adhesives and metal contacts on silicon strip sensors for the ATLAS Inner Tracker
[DESY-THESIS-2018-011]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS , 260 pp. () [10.3204/PUBDB-2018-01870] = Dissertation, Humboldt-Universität zu Berlin, 2018  GO
This thesis presents studies investigating the use of adhesives on the active area of silicon strip sensors for the construction of silicon strip detector modules for the ATLAS Phase-II Upgrade. 60 ATLAS07 miniature sensors were tested using three UV cure glues in comparison with the current baseline glue (a non-conductive epoxy).The impact of irradiation on the chemical composition of all adhesives under investigation was studied using three standard methods for chemical analysis: quadrupole time-of-flight mass spectroscopy, gel permeability chromatography and gas chromatography combined with mass spectrometry (GC-MS). [...]
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2018-04-26
17:03
OpenAccess [PUBDB-2018-01866] Book/Report/Dissertation / PhD Thesis
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Multijet Production with the ZEUS Detector at HERA
[DESY-THESIS-2018-009]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY THESIS , 283 pp. () [10.3204/PUBDB-2018-01866] = Dissertation, Universität Hamburg, 2017  GO
Measurements of the inclusive dijet and trijet production in neutral current deep inelastic ep scattering (DIS) and the inclusive dijet photoproduction (PHP) are presented. The results are based on data from the ZEUS detector at HERA ep collider collected in 2004–2007 and corresponding to integrated luminosities of 295 and 300 inverse pb, respectively..
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2018-04-26
13:42
OpenAccess [PUBDB-2018-01857] Book/Report/Dissertation / PhD Thesis
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Design Study of a Laser-Driven X-ray Source for Medical Fluorescence Imaging
[DESY-THESIS-2018-010]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY THESIS , 171 pp. () [10.3204/PUBDB-2018-01857] = Dissertation, Universität Hamburg, 2017  GO
Thomson scattering, or inverse Compton scattering, is a technique holding the potentialfor the generation of X-radiation of high brilliance on the basis of the photon emission byrelativistic electrons in optical laser fields. When combined with laser-plasma accelerators,purely laser-driven X-ray sources can be realised on a small scale compared to conventionalaccelerator-based sources. [...]
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2018-04-19
14:12
OpenAccess [PUBDB-2018-01793] Book/Report/Dissertation / PhD Thesis
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Beyond the SM searches at the LHC: Little Higgs models and Effective Field Theory
[DESY-THESIS-2018-008]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS , 117 pp. () [10.3204/PUBDB-2018-01793] = Dissertation, Universität Hamburg, 2018  GO
In this thesis, we discuss two different approaches to physics beyond the Standard Model.First, we study a model-independent Effective Field Theory formalism. In particular, wefocus on bosonic CP-even six-dimensional operators. [...]
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