Books

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. [...]

This thesis presents results obtained with the high granularity Analog Hadron Calorimeter (AHCAL) technological prototype. It studies the structure of hadronic showers combining for the first time the time information and the energy information of each hit in the detector.High granularity is a stringent requirement for the calorimeter system of an experiment at the International Linear Collider (ILC), where the application of the Particle Flow Algorithm is foreseen to achieve an unprecedented jet energy resolution.The CALICE Collaboration is studying several technologies satisfying this requirement. [...]

The International Linear Collider (ILC) is a planned electron-positron colliderwith polarised beams and centre-of-mass energies of up to 500 GeV. By performinghigh-precision measurements of Standard Model observables and searches for newparticles it can complement the potential of the Large Hadron Collider (LHC).One of the most prominent open questions in physics is the nature of dark matter.Weakly Interacting Massive Particles (WIMPs) are possible candidates for darkmatter, which can be searched for at colliders. [...]

This book describes the application of a novel technology for beam instrumentation and luminosity measurement and first results on a cutting edge technology potentially to be used after the upgrade of the Large Hadron Collider to higher luminosity.It presents a unique diamond-based luminometer with a detailed performance study.The online bunch-by-bunch luminosity measurements provide an invaluable feedback to the Collider for beam optimisation and for the understanding of beam dynamics.The precision of the luminosity measurement is crucial for all physics analyses. This book highlights the Van der Meer method, which is used for the calibration of the luminometers of the CMS (Compact Muon Solenoid) experiment, and describes the estimate of systematic uncertainties, e.g. [...]

Coherent X-ray diffractive imaging (CXDI) is a novel microscopy technique that uses the unique X-ray properties of advanced synchrotron and X-ray free-electron laser (XFEL) radiation sources. According to Abbe’s theory, the wavelength of light sets the ultimate limit of resolution in microscopes. [...]

This thesis presents a search for Supersymmetry (SUSY), which is a popular extension of the Standard Model of particle physics (SM). The search is performed in proton-proton collision data in final states with jets and a large transverse momentum imbalance.The analyzed data were collected with the CMS experiment at the CERN LHC in 2016 at a center-of-mass energy of 13 TeV and correspond to an integrated luminosity of 35.9 fb${}^{-1}$. [...]

Non-supersymmetric Grand Unified $SO(10)\times U(1)_{\rm PQ}$ models have all the ingredients to solve several fundamental problems of particle physics and cosmology -- neutrino masses and mixing, baryogenesis, the non-observation of strong CP violation, dark matter, inflation -- in one stroke. The axion -- the pseudo Nambu-Goldstone boson arising from the spontaneous breaking of the $U(1)_{\rm PQ}$ Peccei-Quinn symmetry -- is the prime dark matter candidate in this setup. [...]

The RF needs for the TESLA Test Facility a DESY are described. Possible klystron‐modulator schemes, the waveguide RF distribution system, phase and amplitude control, beam loading, and a scheme to cope with detuning of the cavities due to Lorentz forces are described [...]