Calculation of the Beam Field in the LCLS Bunch Length Monitor

Stupakov, G. ; Ding, Y. ; Huang, Z. ; /SLAC

Stanford Linear Accelerator Center

关键词: Synchrotron Radiation;    43 Particle Accelerators;    Diffraction;    X-Ray Sources Accelerators,Accphy, Xfel;    Compressors;   

DOI  :  10.2172/883262
RP-ID  :  SLAC-PUB-11890
RP-ID  :  AC02-76SF00515
RP-ID  :  883262

美国|英语

来源: UNT Digital Library

【 摘 要 】

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, relative bunch length monitors (BLM) right after both bunch compressors are 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 develop 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.