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Title |
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| MOPPH009 |
Beam Dynamics Experiments and Analysis on CSR Effects at FLASH
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56 |
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- B. Beutner, W. Decking, M. Dohlus, T. Limberg, M. Roehrs
DESY, Hamburg
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High peak currents at the FLASH linac are produced using magnetic bunch compressor chicanes. In these magnetic chicanes, the energy distribution along an electron bunch is changed by the emission of coherent synchrotron radiation (CSR). Due to dispersion, these energy changes lead to transverse displacements along the bunch. The projection into the longitudinal horizontal plane is observed with a transverse deflecting rf-structure. Measurements of CSR induced transverse displacements are presented and compared with simulations.
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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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300 |
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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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