A study of pickup and signal processing for HLS-Ⅱ bunch current measurement system

YANG Yong-Liang; MA Tian-Ji; SUN Bao-Gen; WANG Ji-Gang; ZOU Jun-Ying; CHENG Chao-Cai; LU Ping

doi:10.1088/1674-1137/37/9/097006

Chinese Physics C> 2013, Vol. 37> Issue(9) : 097006 DOI: 10.1088/1674-1137/37/9/097006

A study of pickup and signal processing for HLS-Ⅱ bunch current measurement system

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Abstract：
For the HLS-Ⅱ bunch current measurement system, in order to obtain the absolute value of bunch current, the calibration factor should be determined by using DCCT. At the HLS storage ring, the stretch effect of bunch length is observed and the change rate is about 19% when the bunch current decays over time and this will affect the performance of bunch current detection. To overcome the bunch stretch influence in the HLS-Ⅱ bunch current measurement, an evaluation about pickup type and signal processing is carried out. Strip-line pickup and button pickup are selectable, and the theoretical analysis and demonstration experiment are performed to find out an acceptable solution for the bunch current measurement system at HLS-Ⅱ. The experimental data analysis shows that the normalized calibration factor will change by about 27% when the bunch length changes by about 19% if using the button pickup and processing by peak value of bunch signal; the influence will be reduced to 2% less if adopting the strip-line pickup and integral.

References

[1]

YANG Yong-Liang, MA Tian-Ji, SUN Bao-Gen et al. Science China Physics, Mechanics Astronomy, 2011, 54(Suppl.2): s299-s312[2] MA Tian-Ji, SUN BAO-Gen, YANG Yong-Liang et al. Atomic Energy Science and Technology, 2010, 44(Suppl): 217-521 (in Chinese)[3] ZHANG L, MA H Z, YUE J H. Chinese Physics C (HEP NP), 2008, 32(3): 218-221[4] LENG Yong-Bin, YAN Ying-Bing, ZHOU Wei-Min et al. High Power Laser and Particle Beams, 2010, 22(12): 2973-2978 (in Chinese)[5] WANG J G, SUN B G, WANG B Y et al. Beam Parameters Measurement With A Streak Camera in HLS. Proceedings of PAC09, Vancouver, BC, Canada, 2009[6] HUANG S T, LENG Y B, YAN Y B. Nuclear Science and Techniques, 2009, 20(1): 71-75

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YANG Yong-Liang, MA Tian-Ji, SUN Bao-Gen, WANG Ji-Gang, ZOU Jun-Ying, CHENG Chao-Cai and LU Ping. A study of pickup and signal processing for HLS-Ⅱ bunch current measurement system[J]. Chinese Physics C, 2013, 37(9): 097006. doi: 10.1088/1674-1137/37/9/097006

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Received: 2012-10-30
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

A study of pickup and signal processing for HLS-Ⅱ bunch current measurement system

Corresponding author: YANG Yong-Liang,

Corresponding author: SUN Bao-Gen,

Received Date: 2012-10-30
Accepted Date: 1900-01-01
Available Online: 2013-09-05

Abstract: For the HLS-Ⅱ bunch current measurement system, in order to obtain the absolute value of bunch current, the calibration factor should be determined by using DCCT. At the HLS storage ring, the stretch effect of bunch length is observed and the change rate is about 19% when the bunch current decays over time and this will affect the performance of bunch current detection. To overcome the bunch stretch influence in the HLS-Ⅱ bunch current measurement, an evaluation about pickup type and signal processing is carried out. Strip-line pickup and button pickup are selectable, and the theoretical analysis and demonstration experiment are performed to find out an acceptable solution for the bunch current measurement system at HLS-Ⅱ. The experimental data analysis shows that the normalized calibration factor will change by about 27% when the bunch length changes by about 19% if using the button pickup and processing by peak value of bunch signal; the influence will be reduced to 2% less if adopting the strip-line pickup and integral.