Characterisation of Electron Beams with Coherent Diffraction Radiation

by Ishkhan Gorgisyan

Monday 15 Jul 2013, 16:00 → 17:00 Europe/Zurich

WBGB/019 (PSI)

The Swiss Free Electron Laser (FEL) is the upcoming project of Paul Scherrer Institut. The outcome of the project will be a light source providing extremely bright short-pulsed radiation in X-ray wavelengths. A compact linear accelerator will be built to obtain electron bunches as short as tens of femtoseconds for emission of such a radiation. For the sake of stability of the operation the electron beam must be monitored all along the accelerator. One of the possible methods for longitudinal diagnostics is the measurement of coherent diffraction radiation (CDR) emitted by a bunch of electrons. The objective of this work is to characterise a CDR diagnostics technique. Simulation of the radiation was done for SwissFEL and SwissFEL Injector Test Facility (SITF). The beam profiles were simulated for various compressions at different energies. The sensitivity of the CDR system with respect to the bunch length change was studied. The radiation was measured by pyroelectric detectors for different compressions and charges of the beam in SITF. A high-pass THz filter was tested and characterised. The detectors that were used for the measurements were calibrated.

Abstract Gorgisyan.pdf