Ph.D. Theses

In the scope of this thesis work, the existing diagnostic setups for the transverseand longitudinal phase space characterization at the Photo Injector Test facility atDESY in Zeuthen (PITZ) have been utilized to obtain detailed and reliable results.PITZ, being a test facility for European XFEL and FLASH, needs to do detailedcharacterization of electron beams to ensure that they meet the requirements ofthe FELs, i.e., small transverse emittance and energy spread as well as high peakcurrent.For the reconstruction of the horizontal and vertical phase spaces, PITZ utilizes aslit scan technique as a standard tool because of its space charge dominated electronbeams. A novel method for 4 dimensional transverse phase space characterization,known as virtual pepper pot, is proposed that can give insight to the transversebeam phase space coupling. [...]

Laser-plasma accelerators (LPA) utilize intense laser pulses to drive plasma waves, generating strong electric fields capable of accelerating electrons to relativistic energies. This technology promises accelerator facilities that are orders of magnitude smaller than their conventional counterparts. [...]

The origin of neutrino masses is one of the open questions of particle physics. This thesis presents work on the high-energy equivalent of neutrinoless double-beta decay. [...]

Various astrophysical observations point towards an as-of-yet unexplained, mainly gravitationally interacting type of matter. If this matter, called Dark Matter, is an elementary particle, it could be produced in particle collisions at the Large Hadron Collider [...]

Proteins play a crucial role in living cells. Their functions are determined by their three-dimensional (3D) structure. [...]

The investigation of proteins is highly relevant due to their various functions in living organisms mand their importance in nutrition. A technique that can access the collective dynamics of proteins in solution is X-ray photon correlation spectroscopy ($XPCS$). [...]

Neutrinooszillationen sind das einzige Phänomen jenseits des Standardmodells, das experimentell mit hoher statistischer Signifikanz bestätigt wurde. Diese Arbeit präsentiert eine Messung der atmosphärischen Neutrinooszillationen unter Verwendung von acht Jahren an Daten, die zwischen 2011 und 2019 vom IceCube DeepCore-Detektor aufgenommen wurden [...]

Zinc-dependent hydrolases are a class of metalloenzymes that require zinc ions to catalysehydrolytic reactions. Structural studies of these enzymes shall provide detailed information aboutthe processing of their natural substrates, domain organization, and overall structural fold. [...]