中国散裂中子源RFQ的研制  

Development of CSNS RFQ

作　　者：肖永川[1,2] 欧阳华甫[1,2] 薛康佳[1,2] 刘盛进[1,2] 曹秀霞[1,2] 吕永佳[1,2] 黄涛[1,2] 

机构地区：[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

出　　处：《核技术》2015年第12期1-7,共7页Nuclear Techniques

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20μm,RFQ腔体无载品质因子Q0大于7 679,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 k W,是理论腔耗390 k W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 Me V、28 m A的负氢束流,满足中国散裂中子源的要求。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 ~tm; 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.

关 键 词：射频四极加速器 高功率RF老练 RF电场分布平整度 中国散裂中子源 

分 类 号：TL53[核科学技术—核技术及应用]