A study of pickup and signal processing for HLS-Ⅱ bunch current measurement system |
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作者姓名: | 杨永良 马天骥 孙葆根 王季刚 邹俊颖 程超才 卢平 |
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作者单位: | National Synchrotron Radiation Laboratory (NSRL), University of Science and Technology of China, Hefei 230029, China |
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摘 要: | 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.
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关 键 词: | bunch current bunch length strip-line electrode button electrode BPM DCCT |
收稿时间: | 2012-10-30 |
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