Beam Profile Measurements in the Presence of Coherent Optical Transition

by Mrs Minjie Yan (DESY, Hamburg)

Tuesday 21 Aug 2012, 10:00 → 11:00 Europe/Zurich

WBGB/019 (PSI)

High-brightness electron beams with low energy spread at existing and future x-ray free-electron lasers, e.g. FLASH , LCLS, SwissFEL, are affected by various collective beam self-interactions and microbunching instabilities. The corresponding coherent optical radiation effects, e.g., coherent optical transition radiation COTR, render electron beam profile imaging impossible and become a serious issue for all kinds of electron beam diagnostics using imaging screens. Methods to suppress coherent optical radiation effects both by electron beam profile imaging in dispersive beamlines and by using scintillation imaging screens in combination with separation techniques are discussed. Transverse and longitudinal electron beam profile measurements carried out at FLASH in the presence of coherent optical radiation effects in non-dispersive beamlines are demonstrated by applying a temporal separation technique.

Contact V. Schlott (4237)