| Paper |
Title |
Page |
| TUPMN020 |
Velocity Bunching at the European XFEL
|
959 |
| |
- T. Limberg, B. Beutner, W. Decking, M. Dohlus, K. Floettmann, M. Krasilnikov
DESY, Hamburg
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This paper explores the possibility to employ velocity bunching in the first RF module of the European XFEL to increase the peak current at the injector exit. The current increase will reduce the total longitudinal bunch compression factor and loosen rf jitter tolerances by the same amount. The relation between rf tolerances and micro-bunching instability gain is discussed and the injector optimization for cases of velocity bunching to 100A and 200A peak current are presented in detail. Finally, plans for velocity bunching experiments at the FLASH facility (Free Electron Laser in Hamburg) are laid out.
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| FRPMN063 |
Superconducting RF Gun Cavities for large Bunch Charges
|
4150 |
| |
- V. Volkov
BINP SB RAS, Novosibirsk
- K. Floettmann
DESY, Hamburg
- D. Janssen
FZD, Dresden
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The first electron beam of the RF gun with a 3.5 cell superconducting cavity is expected in July 2007 in FZD. This cavity has been designed for small bunch charges. In the paper we present the design of a similar cavity and of 1.5 cell gun cavities for large bunch charges. For a charge of 2.5 nC, which is the design value of the BESSY-FEL, and a bunch length of 21 ps a projected transverse emittance less then 1 π mm mrad has been obtained (without thermal emittance).
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