Abstract:
Characterized by its compactness, convenience, high current and high transmission, radio frequency quadrupole (RFQ) 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.