Nuclear Techniques ›› 2018, Vol. 41 ›› Issue (7): 70402-070402.doi: 10.11889/j.0253-3219.2018.hjs.41.070402

• NUCLEAR ELECTRONICS AND INSTRUMENTATION • Previous Articles     Next Articles

Development and application of digital beam position measurement processor for FEL

LAI Longwei1, LENG Yongbin1, YAN Yingbing1, CHEN Fangzhou1,2, CHEN Jian1,2, ZHOU Weimin1, ZHANG Ning1   

  1. 1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai 201800, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2016-12-28 Revised:2017-05-21 Online:2018-07-10 Published:2018-07-07
  • Supported by:
    Supported by National Natural Science Foundation of China (No.11305253, No.11375255, No.11575282)

Abstract: [Background] Data acquisition and signal processing of stripline beam position monitor (SBPM) and cavity beam position monitor (CBPM) is important for the high resolution beam control on free electron laser (FEL). The resolution requirements of SBPM and CBPM are 10 μm and 1 μm respectively at the beam current of 0.5 nC on Dalian coherent light source (DCLS) and Shanghai X-ray free electron laser (SXFEL). [Purpose] This study aims to develop a digital BPM processor (DBPM) to meet those requirements and apply to both DCLS and SXFEL. [Methods] The DBPM is designed as a standalone instrument which includes radio frequency (RF) signal conditioning, analog signal digitizer, digital signal processing, and system controller. A field programmable gate array (FPGA) chip is used as system central component, and the experimental physics and Instrument control system (EPICS) is integrated in the advanced RISC machine (ARM) Linux for data acquisition and communication. Both the Lab test and practical on-site test for DCLS are performed. [Results] Beam test results of DBPM resolution on SBPM and CBPM are 4 μm and 0.4 μm, respectively. [Conclusion] The DBPM performance meets the design specification and has been applied on DCLS successfully, it will be applied to SXFEL.

Key words: FEL, DBPM, SBPM, CBPM, DCLS, SXFEL

CLC Number: 

  • TL99