Roehrs, M.

Paper	Title	Page
WG303	Beam Dynamics Experiments and Analysis in FLASH on CSR and Space Charge Effects
	B. Beutner, M. Dohlus, M. Roehrs DESY, Hamburg
	High peak currents at the FLASH linac gives rise to strong self interactions like space charge fields and coherent synchrotron radiation wakes. These forces leads to distorted electron bunches. Simulations and measurements are presented to demonstrate the beam dynamics at FLASH. The projections into the longitudinal horizontal plane are observed with a transverse deflecting cavity. Measurements of CSR induced transverse displacements are presented and compared with simulations.
	Slides
WG511	Time-Resolved Measurements using a Transversely Deflecting RF-Structure
	M. Roehrs, C. Gerth, H. Schlarb DESY, Hamburg
	In SASE-based Free Electron Lasers as FLASH at DESY, the knowledge of time-related parameters of electron bunches as bunch length, energy-time correlation and time-sliced emittance is important for FEL-operation and for analysing bunch compression processes. In order to measure such parameters, a vertically deflecting rf-structure has been installed at FLASH and taken into operation in early 2005. The structure allows to establish the longitudinal density profile of single bunches on the vertical axis of an OTR-screen. The horizontal time-sliced emittance can be reconstructed from measurements of the slice widths for different quadrupole settings. By dispersing vertically streaked bunches horizontally with a dipole, the energy-time correlation can be directly obtained in a single shot measurement. In this paper some results of recent measurements are presented.
	Slides