Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2011, Vol. 22 ›› Issue (5): 261-264 doi: 10.13538/j.1001-8042/nst.22.261-264

• SYNCHROTRON TECHNOLOGY AND APPLICATIONS • Previous Articles     Next Articles

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

CHEN Zhichu LENG Yongbin~* ZOU Yi YAN Yingbin ZHOU Weimin   

  1. Shanghai Synchrotron Radiation Facility,Shanghai Institute of Applied Physics,Shanghai 201800,China
CHEN Zhichu, LENG Yongbin, ZOU Yi, YAN Yingbin, ZHOU Weimin . Baseline recovery method to measure bunch charge under low-current mode of SSRF.Nuclear Science and Techniques, 2011, 22(5): 261-264     doi: 10.13538/j.1001-8042/nst.22.261-264

Abstract:

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%.

Key words: Beam diagnostics, ICT, Bunch charge monitor, Top-up, SSRF