Nuclear Techniques ›› 2016, Vol. 39 ›› Issue (3): 30403-030403.doi: 10.11889/j.0253-3219.2016.hjs.39.030403


Low level radio frequency system of 15-MeV electrons linac

ZHANG Junqiang, LIU Yajuan, ZHONG Shaopeng, LI Lin, LI Yingmin, GU Qiang   

  1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai 201800, China
  • Received:2015-10-15 Revised:2016-01-05 Online:2016-03-10 Published:2016-03-11
  • Supported by:

    Supported by Strategic Priority Research Program of Chinese Academy of Sciences (No.XDA02010100)


Background: The photo-neutron source driven by 15-MeV electrons linac in Thorium molten salt reactor (TMSR) program was designed for nuclear data measurement. Purpose: To ensure the linac to provide stable and high quality beam bunches, a low level radio frequency (LLRF) control system based on field programmable gate array (FPGA) was developed. Methods: LLRF realized digital amplitude and phase feedback control by using up-down converter, IQ (In-phase and Quadrature) modulator and demodulator techniques. Results: After commission, the control accuracy of amplitude and phase is less than ±0.4% and ±0.6°, respectively. Conclusion: Long time running indicates that the whole digital control loop has the properties of fast time response and good stability, which meets the demand of photo-neutron facility.

Key words: Linac, LLRF, FPGA, Waveform acquisition, Feedback control

CLC Number: 

  • TL274+.2