分离作用射频四极场加速器的结构和工艺设计

Structure and process design of separated function radio frequency quadruple accelerator

介绍了北京大学分离作用射频四极场(RFQ)加速器的结构特点,包括膜片式电极、支撑环式电极支撑系统、水冷系统、调谐系统及其工艺实现;介绍了基于该分离作用RFQ加速腔进行的调谐测试、高功率实验和束流实验。结果表明:调谐系统的频率调节范围及品质因数完全满足实验要求;分离作用RFQ加速腔的输入功率可以达到33 kW以上,满足高功率下稳定运行的条件;在束流实验中,把1.03 MeV的O+入射束流加速到1.65 MeV,半高宽能散小于3%。加速器结构满足物理设计要求,加速系统运行稳定。

The construction features of separated function radio frequency quadrupole（SFRFQ） accelerator are presented,which include the structure of diaphragms electrodes,integral split ring supporting system,cooling system,tuning system and their manufacturing engineering.The analysis with 8753ES network analyzer proves that the tuning system works successfully to tune the SFRFQ frequency at 26.07 MHz as required by the whole acceleration system without significant quality factor declining.The Roentgen spectrum test at high power proves that the inter-vane voltage can reach higher than the design value of 70 kV.Beam commissioning was carried out to accelerate the O^＋ ions from 1.03 MeV to 1.65 MeV,which demonstrates that the mechanical design of SFRFQ accelerator can satisfy the experimental demands and the SFRFQ prototype cavity runs stably as designed.