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| TUBAU06 |
Investigations of the Longitudinal Electron Bunch Structure at the FLASH Linac with a Transverse Deflecting RF-Structure
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- M. Roehrs, C. Gerth, H. Schlarb
DESY, Hamburg
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At the FLASH linac at DESY, electron bunches with high peak currents are produced by bunch shortening in two magnetic chicanes induced by a nearly linear energy-time gradient. Thereby the high current region of a compressed bunch is distorted by coherent synchrotron radiation and space charge forces. Consequences of these effects are a degradation of time-sliced transverse emittance, slice centroid shifts and characteristic energy-time correlations. In this paper we present measurements of the aforementioned quantities for different compression schemes with a transverse deflecting rf-waveguide (LOLA). 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. The measurement results are compared to simulations.
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