Nuclear Techniques ›› 2015, Vol. 38 ›› Issue (12): 120201-120201.doi: 10.11889/j.0253-3219.2015.hjs.38.120201


Development of CSNS RFQ

XIAO Yongchuan1,2 OUYANG Huafu1,2 XUE Kangjia1,2 LIU Shengjin1,2 CAO Xiuxia1,2 LYU Yongjia1,2 HUANG Tao1,2   

  1. 1(China Spallation Neutron Source, Institute of High Energy Physics, Chinese Academy of Sciences, Dongguan 523803, China) 2(Dongguan Institute of Neutron Science, Dongguan 523808, China)
  • Received:2015-09-02 Revised:2015-11-03 Online:2015-12-10 Published:2015-12-15
  • About author:XIAO Yongchuan, male, born in 1983, graduated and awarded the master’s degree from Institute of High Energy Physics, Chinese Academy of Sciences, research area is accelerator technology

Abstract: Background: A Radio Frequency Quadruple (RFQ) accelerator was developed for China Spallation Neutron Source (CSNS). Purpose: The aim is to design a 3-MeV, 20-mA H? RFQ accelerator. Methods: Lots of careful investigations, analysis, experimental tests were performed to solve the problem that came out in design and machining process. Results: The machining tolerance of RFQ measured by three-Coordinate Measuring Machine (CMM) was less than 20 μm; the unloaded Q value was 7 679, about 80% of the theoretical Q value; the flatness of RF electric field distribution was higher than 2.5% after several time tuning. After several days conditioning, the power feeding into the cavity reached 450 kW and maintained for 12 h without sparking. Negative hydrogen ion beam with energy of 3 MeV and current of 28 mA at the exit of RFQ was gotten in the beam commissioning afterwards. Conclusion: The current commissioning results of RFQ meets the requirement of CSNS, and the beam current can be improved in future.

Key words: RFQ, High power RF conditioning, Flatness of RF electric field distribution, CSNS