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研制了一套强流质子源及低能传输线(LEBT)注入器用于ADS质子直线加速器。质子源产生35 ke V强流束经过低能传输段聚焦进入射频四极(RFQ)入口。低能传输段不匹配是强流RFQ中引起束流丢失的主要原因。不同加速段的束流匹配是减少束流损失与抑制发射度增长的重要手段。束流损失导致RFQ电极表面受热变形进而引起高频打火,降低RFQ长期运行的稳定性。针对以上问题,研究LEBT发射度在不同的实验条件下如何实现加速器更好的匹配。研究结果表明,LEBT出口束流在35 ke V,10 m A下,束流发射度小于0.2πmm·mrad,当LEBT螺线管电流为210和270 A时,束流在RFQ入口满足匹配条件。
A set of high-flow proton sources and low-energy transmission line (LEBT) injectors was developed for the ADS proton linear accelerator. The proton source produces a 35 keV intense beam that is focused through the low-energy transmission section into the RF quadrupole (RFQ) inlet. Low-energy transmission segment mismatch is the main cause of beam loss in a strong RFQ. The beam matching at different accelerating sections is an important means to reduce the beam loss and suppress the increase of the emittance. Beam loss causes the surface of the RFQ electrode to be heated and deformed, causing high-frequency ignition and reducing the stability of the long-term RFQ operation. In view of the above problem, how to achieve a better match of accelerator under different experimental conditions is studied. The results show that the beam emittance of LEBT is less than 0.2πmm · mrad at 35 ke V and 10 m A, and the beam matches the RFQ inlet at LEBT solenoid current of 210 and 270 A.