METHODICAL STUDIES FOR TOMOGRAPHIC RECONSTRUCTION AS A NOVEL METHOD FOR EMITTANCE MEASUREMENTS AT THE PITZ FACILITY

Abstract The Photo-Injector Test Facility at DESY in Zeuthen, PITZ, is dedicated to the development of high brightness electron sources for linac-based FELs like FLASH and the European XFEL. A key parameter to judge on the beam quality for an FEL is the transverse phase space distribution, wherefrom the PITZ beamline is equipped with three Emittance Measurement Systems. In 2010 the diagnostics has been upgraded with a module for tomographic reconstruction comprising three FODO cells, each surrounded by two observation screens. The anticipated advantages of tomographic measurements are improved resolution for low charge beams and ability to evaluate both transverse planes simultaneously. Major operational challenges are the low beam energies the module will be used with -15 -30 MeV, strong space charge effects for high bunch charges and, consequently, difficulties to match the beam into the optics of the lattice. This contribution presents studies on the performance of the module for different initial conditions as bunch charge and temporal laser pulse shape. Influence of residual noise on the quality of the reconstructed phase space is discussed

Simulations and Measurements of Dipole and Quadrupole Magnets for PBP-CMU Linac System

AbstractThe PBP-CMU Linac system has been established to generate femtosecond electron bunches and to study their applications, especially for generation of coherent terahertz (THz) radiations. The dipole magnet and the prototype quadrupole magnet for the system have been designed and fabricated in house. Both the simulated and the measured results were used for evaluating the magnet performance and will be used as a guideline for design and fabrication of magnet devices in the future

Generation of Femtosecond Electron And Photon Pulses

Femtosecond (fs) electron and photon pulses become a tool of increasing importance to study dynamics in ultrafast processes. Such short electron pulses can be generated from a system consisting of a thermionic-cathode RF-gun and a magnetic bunch compressor. The fs electron pulses can be used directly or used as a source to produce equally short electromagnetic radiation pulses via certain kind of radiation production processes. At the Fast Neutron Research Facility (FNRF), Thailand, we are especially interested in production of radiation in Farinfrared and X-ray regime. In the far-infrared wavelengths, the radiation emitted from fs electron pulses is emitted coherently resulting high intensity radiation. In the X-ray regime, development of fs X-ray sources is crucial for application in ultrafast sciene