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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。
China spallation neutron source developed a radio frequency quadrupole RFQ (Radio Frequency Quadrupole) strong stream proton accelerator. In order to ensure the success of the RFQ, the problems in the process of welding, RF tuning and RFR (Radio Frequency) sophistication were analyzed, and the solutions and the tuning experiments were given. The coordinate tolerance of RFQ after finishing is about 20μm. The unloaded Q0 of the RFQ cavity is more than 7 679, which is about 80% of the theoretical unloaded Q0 value. The flatness of the RF electric field distribution in the RFQ cavity is better than 2.5%. The power of the RFQ high-power RF sophisticated cavity reaches 450 k W, which is 1.15 times the theoretical cavity consumption of 390 k W, and remains unlit for 12 h. In the RFQ beamforming experiment, the RFQ outlet has a negative 3 MeV, 28 m A negative ion beam that meets the requirements of China’s spallation neutron source.