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 ›› 2015, Vol. 26 ›› Issue (3): 030402 doi: 10.13538/j.1001-8042/nst.26.030402

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Research into the sampling methods of digital beam position measurement

State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, China   

  1. State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, China
  • Contact: ZHAO Lei E-mail:zlei@ustc.edu.cn
  • Supported by:

    Supported by the Knowledge Innovation Program of the Chinese Academy of Sciences (No. KJCX2-YW-N27) and National Natural Science Foundation of China (Nos. 11205153 and 11175176)

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WU Wei-Hao, ZHAO Lei, CHEN Er-Lei, LIU Shu-Bin, and AN Qi . Research into the sampling methods of digital beam position measurement.Nuclear Science and Techniques, 2015, 26(3): 030402     doi: 10.13538/j.1001-8042/nst.26.030402

Abstract:

A fully digital beam position monitoring system (DBPM) has been designed for SSRF (Shanghai Synchrotron Radiation Facility). As analog-to-digital converter (ADC) is a crucial part in the DBPM system, the sampling methods should be studied to achieve optimum performance. Different sampling modes were used and compared through tests. Long term variation among four sampling channels, which would introduce errors in beam position measurement, is investigated. An interleaved distribution scheme was designed to address this issue. To evaluate the sampling methods, in-beam tests were conducted in SSRF. Test results indicate that with proper sampling methods, a turn-by-turn (TBT) position resolution better than 1 μm is achieved, and the slow-acquisition (SA) position resolution is improved from 4.28 μm to 0.17 μm.

Key words: Beam position monitor, Analog-digital conversion, Digital phase-locked loop, Interleaved distribution scheme