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Bunch length measurement using a traveling wave rf deflector

Chinese Physics C 2010年第1期34卷 138-142页

作者： ZHANG Jing-Ru DAI Jian-Ping GU Qiang PEI Guo Xi ZHAO Ming-Hua ZHONG Shao-Peng WANG Xing-Tao CHEN Yong-hong HOU Mi Institute of High Energy Physics CAS Graduate University of Chinese Academy of Sciences Shanghai Institute of Applied Physics CAS

rf deflectors can be used for bunch length measurement with high resolution. This paper describes a completed S-band traveling wave rf deflector and the bunch length measurement of the electron beam produced by the photocathode rf gun of the Shanghai DUV-FEL facility. This is the first time that such a transverse rf deflector has been developed and used to measure the bunch length of picosecond order in China. The deflector＇s VSWR is 1.06, the whole attenuation 0.5 dB, and the bandwidth 4.77 MHz for VSWR less than 1.1. With a laser pulse width of 8.5 ps, beam energy of 4.2 MeV, and bunch charge of 0.64 nC, the bunch lengths for different rf input power into the deflector were measured, and an averaged rms bunch length of 5.25 ps was obtained. A YAG crystal is used as a screen downstream of the deflector, with the calibrated value of 1 pix = 136 μm.

关键词： rf deflector bunch length rf gun HEM11 mode

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Design and studies on the traveling wave transverse rf deflecting structure

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Chinese Physics C 2008年第3期32卷 232-235页

作者：张敬如侯汨戴建枰裴士伦裴国玺 Institute of High Energy Physics CASBeijing 100049China Graduate University of Chinese Academy of SciencesBeijing 100049China Institute of High Energy Physics CASBeijing 100049China

With the development of free electron laser （FEL） and the international linear collider （ILC）, the electron bunch length is getting smaller and smaller, The traveling-wave transverse rf deflecting structure is an important part of the rf deflecting method for bunch length measurement and phase space diagnostics. The operation mode in rf deflector is the ＂TM11-like＂ mode. Since the TM11-like mode in this structure has a pair of degenerate dipole modes, two additional holes are provided on either side of each iris to stabilize the mode. The simulation and optimization have been done. A prototype has been fabricated and tested. The cold test results have been compared with the simulations of the first three modes.

关键词： TM11-like mode rf deflector mode stabilizer vertical polarized wave parallel polarized wave

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