Coordinated Projects

If supersymmetry exists around the TeV scale, it affects not only experiments at the LHC but also searches for rare processes, astroparticle physics and cosmology. The goal of the project was to combine information from all these sources in order to learn as much as possible about processes in the early universe and about physics at very high energies that are inaccessible to colliders. [...]

In project C5 of the SFB 676, we simulated the spectra of cosmological Type Ia supernovae in detail. We use state-of-the-art (3D) NLTE spectral synthesis to analyze the observed multi-wavelength spectra of SNe found in the archives, and make predictions for future observations. [...]

The project B3 of the SFB 676 has been focussed on theoretical and experimental aspects of low-energy neutrinos from artificial and astrophysical sources. The experimental part consists in the study of the background induced by cosmic muons in current low-energy neutrino experiments. [...]

We review a systematic construction of the 2-stack of bundle gerbes via descent, and extend it to non-abelian gerbes. We review the role of non-abelian gerbes in orientifold sigma models, for the anomaly cancellation in supersymmetric sigma models, and in a geometric description of so-called non-geometric T-duals..

A basic treatment of the principle of the linac-driven free-electron laser (FEL) is given. The first part of the paper describes the FEL in low-gain approximation, and in the second part the high-gain FEL theory is given [...]

The work describes hardware layer of the universal, parameterized communication interfacefor application in the FPGA chips. The interface is called in this work as the „Internal Interface” orin short the “II” [...]

The note describes integrated, eight channel system of hardware controller and simulator of the resonant superconducting, narrowband niobium cavity, originally considered for the TTF and TESLA in DESY, Hamburg (now tested for the VUV FEL and developed for X-Ray FEL). The controller bases on a programmable circuit Xilinx VirtexII V4000. [...]

The X-ray free-electron laser XFEL that is being planned at the DESY research center in cooperationwith European partners will produce high-intensity ultra-short X-ray flashes with theproperties of laser light. This new light source, which can only be described in terms of superlatives,will open up a whole range of new perspectives for the natural sciences. [...]

This work comes into being as a part of projects, realized by PERG1group in cooperationwith DESY (Deutsches Elektronen – Synchrotron) in Hamburg, Germany.There are two new projects being developed. X-FEL – X-ray Free Electron Laser andVUV-FEL – Vacuum Ultraviolet Free Electron Laser. [...]