| Paper | Title | Page |
|---|---|---|
| THPPH062 | Calculation of the Beam Field in the LCLS Bunch Length Monitor | 728 |
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Maintaining a stable bunch length and peak current is a critical step for the reliable operation of a SASE based x-ray source. In the LCLS, a bunch length monitor (BLM) right after the bunch compressors is proposed based on the coherent radiation generated by the short electron bunch*. Due to its diagnostic setup, the standard far field synchrotron radiation formula and well-developed numerical codes do not apply for the analysis of the BLM performance. In this paper, we develope a calculation procedure to take into account the near field effect, the effect of a short bending magnet, and the diffraction effect of the radiation transport optics. We find the frequency response of the BLM after the first LCLS bunch compressor and discuss its expected performance.
* J. Wu, P. Emma, Z. Huang, Proceedings of 2005 Particle Accelerator Conference 428. |