北京大学RFQ加速器研究进展

Progress of RFQ Accelerator Study at Peking University

北京大学在20世纪90年代末成功研制了1台整体分离环重离子射频四极场(RFQ)加速器ISR-1000,近年来经升级后它可提供1 MeV/2 mA氧离子束流。为提高RFQ加速器在较高能量下的加速效率,北京大学提出并正在研制1种新型分离作用RFQ加速结构(SFRFQ),所建造的加速腔实验样机可与ISR-1000构成组合加速系统,将mA级氧离子加速到1.6 MeV。北京大学参与了"973"项目350 MHz四翼型强流质子RFQ加速器的研究,并研制了1台全尺寸无氧铜工艺腔。北京大学还计划在近年内建造1台中子源用201.5 MHz2、MeV/50 mA微翼四杆型氘离子RFQ加速器。

Characterized by its compactness, mission, radio frequency quadrupole （RFQ） convenience, high current and high trans accelerator is fit for accelerating the low velocity ions directly from ion source and has become a common injector in low-energy end of main accelerators for many applications such as HPPA, SNS, ADS and RIB facilities. In 1990s the integrated split ring RFQ （ISR-1000） had been constructed and operated successfully at Peking University. In order to accelerate ion beam more efficiently in higher energy range, a novel accelerator structure called separated function RFQ （SFRFQ） had been proposed and its first prototype cavity had been designed and constructed. The prototype cavity will be verified as a post-accelerator for ISR RFQ- 1000 and accelerate O^＋ from 1 MeV to 1.6 MeV. To inject a higher current oxygen beam for the prototype cavity, the beam current of ISR RFQ-1000 was upgraded to 2 mA. Peking University had participated a National Basic Research Program ‘The study of the 350 MHz four vane RFQ for high current proton beam＇ and built a full size copper model cavity. In additional, a 200 MHz mini-vane four rod RFQ to accelerate D＋ beam to 2.0 MeV is going to be manufactured for a neutron radiography system.