Development of CSNS RFQ

XIAO Yongchuan; OUYANG Huafu; XUE Kangjia; LIU Shengjin; CAO Xiuxia; LYU Yongjia; HUANG Tao

doi:10.11889/j.0253-3219.2015.hjs.38.120201

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Development of CSNS RFQ

更新时间：2021-03-03

- Development of CSNS RFQ
- NUCLEAR TECHNIQUES Vol. 38, Issue 12, Article number: 120201(2015)
- 作者机构：
  
  1. 中国科学院高能物理研究所东莞分部,东莞,523803
  2. 东莞中子科学中心,东莞,523808
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2015.hjs.38.120201
  CLC：
- Published：15 December 2015
- 稿件说明：
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XIAO Yongchuan, OUYANG Huafu, XUE Kangjia, et al. Development of CSNS RFQ[J]. Nuclear techniques, 2015, 38(12): 120201
DOI：

XIAO Yongchuan, OUYANG Huafu, XUE Kangjia, et al. Development of CSNS RFQ[J]. Nuclear techniques, 2015, 38(12): 120201 DOI： 10.11889/j.0253-3219.2015.hjs.38.120201.

摘要

中国散裂中子源研发了一台射频四极RFQ (Radio Frequency Quadrupole)强流质子加速器。为保证RFQ顺利出束，对加工焊接阶段、RF调谐调场、高功率RF (Radio Frequency)老练过程中出现的问题进行了分析，给出了解决办法，并进行了调束实验。三坐标测量测得RFQ精加工后的加工公差约在20 μm，RFQ腔体无载品质因子Q0大于7679，约为理论无载Q0值的80%。RFQ腔内RF电场分布的平整度好于2.5%，RFQ高功率RF老练入腔功率达到450 kW，是理论腔耗390 kW的1.15倍，且保持连续12 h不打火。在RFQ调束实验中，RFQ出口得到3 MeV、28 mA的负氢束流，满足中国散裂中子源的要求。

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. Abstract

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