Chinese Physics C > 2013, Vol. 37 > Issue(11): 118001 DOI: 10.1088/1674-1137/37/11/118001

Design and test of SX-FEL cavity BPM

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Abstract：
This paper reports the design and cold test of the cavity beam position monitor (CBPM) for SX-FEL to fulfill the requirement of beam position measurement resolution of less than 1 u m,even 0.1 u m. The CBPM was optimized by using a coupling slot to damp the TM ₀₁₀mode in the output signal. The isolation of TM ₀₁₀mode is about 117 dB,and the shunt impedance is about 200Ω@4.65 GHz with the quality factor 80 from MAFIA simulation and test result. A special antenna was designed to load power for reducing excitation of other modes in the cavity. The resulting output power of TM ₁₁₀mode was about 90 mV/mm when the source was 6 dBm,and the accomplishable minimum voltage was about 200 uV. The resolution of the CBPM was about 0.1u m from the linear fitting result based on the cold test.

References

[1]

Johnson R et al. Cavity BPMs for the NLC. SLAC-PUB-9211,2002[2] Walston S et al. Performance of a High Resolution Cavity Beam Position Monitor System. SLAC-PUB-12492,2007[3] Maesaka H,Inoue S et al. Development of the RF Cavity BPM of XFEL/Spring-8 DIPAC09,2009[4] CHU J H. Development of a C-band Cavity BPM and RF Electronics (Doctoral Thesis). Shanghai: Shanghai Institute of Applied Physics,2008(in Chinese)[5] LUO J. Research of a Cavity BPM System (Doctoral Thesis). Hefei: University of Science and Technology of China,2008(in Chinese)

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YUAN Ren-Xian, ZHOU Wei-Min, CHEN Zhi-Chu, YU Lu-Yang, WANG Bao-Pen and LENG Yong-Bin. Design and test of SX-FEL cavity BPM[J]. Chinese Physics C, 2013, 37(11): 118001. doi: 10.1088/1674-1137/37/11/118001

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Received: 2013-01-07
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Design and test of SX-FEL cavity BPM

Corresponding author:YUAN Ren-Xian,

Received Date:2013-01-07
Accepted Date:1900-01-01
Available Online:2013-11-05

Abstract:This paper reports the design and cold test of the cavity beam position monitor (CBPM) for SX-FEL to fulfill the requirement of beam position measurement resolution of less than 1 u m,even 0.1 u m. The CBPM was optimized by using a coupling slot to damp the TM₀₁₀mode in the output signal. The isolation of TM₀₁₀mode is about 117 dB,and the shunt impedance is about 200Ω@4.65 GHz with the quality factor 80 from MAFIA simulation and test result. A special antenna was designed to load power for reducing excitation of other modes in the cavity. The resulting output power of TM₁₁₀mode was about 90 mV/mm when the source was 6 dBm,and the accomplishable minimum voltage was about 200 uV. The resolution of the CBPM was about 0.1u m from the linear fitting result based on the cold test.