Baseline recovery method to measure bunch charge under low-current mode of SSRF

SYNCHROTRON TECHNOLOGY AND APPLICATIONS

Baseline recovery method to measure bunch charge under low-current mode of SSRF

CHEN Zhichu，

LENG Yongbin，

ZOU Yi，

YAN Yingbin，

ZHOU Weimin

Nuclear Science and Techniques

Vol.22, No.5

pp.261-264

Published in print 20 Oct 2011

DOI：10.13538/j.1001-8042/nst.22.261-264

31201

The top-up injection mode of Shanghai Synchrotron Radiation Facility (SSRF) needs precise measurement of the beam bunch charges. This is performed by an integration current transformer, but the beam current is too low to neglect the background noise. In order to wipe out the noise coming from the ground loops, the adaptable polynomial fitting method is used to extract the baseline, instead of using the constant background or the linear background model. Test results show that the system resolution can be improved to <3%.

Beam diagnosticsICTBunch charge monitorTop-upSSRF

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