The 10-MeV Accelerator-Driven Subcritical(ADS)system Injector-I test stand at the Institute of High Energy Physics(IHEP)is a testing facility dedicated to demonstrating the feasibility of the spoke-based super-conduct...The 10-MeV Accelerator-Driven Subcritical(ADS)system Injector-I test stand at the Institute of High Energy Physics(IHEP)is a testing facility dedicated to demonstrating the feasibility of the spoke-based super-conducting(SC)linear accelerator(linac)for the ADS project in China.The injector adopted a four-vane copper structure radio frequency quadrupole(RFQ)with an output energy of 3.2 MeV and an SC section accommodating 14 β_(g)=0.12 single spoke cavities,14 SC solenoids,and 14 cold beam position monitors(BPMs).A 10-MeV pulsed beam with a beam current of 10 mA and a 2-mA continuous wave(CW)beam were successfully shooting through.The commissioning results confirmed the feasibility of using a 325-MHz spoke-type cavity for accelerating the proton beam in the low β and medium β sections.This paper describes the results achieved,the difficulties encountered,and the experiences obtained during commissioning.展开更多
Background The Beijing Electron Positron Collider(BEPCII)is a high-brightness collider and operates in compatible mode of synchronous light source.This summer,BEPCII spare cavity,which was all made in China,had been p...Background The Beijing Electron Positron Collider(BEPCII)is a high-brightness collider and operates in compatible mode of synchronous light source.This summer,BEPCII spare cavity,which was all made in China,had been put into BEPCII operation,and the LLRF system for the spare cavity was also upgraded at the time.Purpose The purpose is to stably control the amplitude and phase of the spare cavity and apply digital technology to achieve some intelligent functions.Methods The digital method is applied in the superconducting cavity feedback control of the accelerator and it introduces the digital technology of the RF low-level control system that has been stably applied to the BEPCII spare cavity operation.In addition,some functions such as quench detector and input protection as well as horizontal test have been realized in the RF system operation.Results The amplitude and phase stabilities of cavity voltage with beam in the digital LLRF have reached±0.09%(RMS)and±0.055°(RMS),respectively.Conclusion The BEPCII spare cavity with digital LLRF system has been stably operated for 2 months.The DLLRF system has been reliable and stable,and the performance of the spare cavity with beam was very good.展开更多
基金This work was supported by Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDA03030201)the Key Laboratory of Particle Acceleration Physics and Technology Autonomous Foundation of CAS China(No.JSQ2017ZZ01).
文摘The 10-MeV Accelerator-Driven Subcritical(ADS)system Injector-I test stand at the Institute of High Energy Physics(IHEP)is a testing facility dedicated to demonstrating the feasibility of the spoke-based super-conducting(SC)linear accelerator(linac)for the ADS project in China.The injector adopted a four-vane copper structure radio frequency quadrupole(RFQ)with an output energy of 3.2 MeV and an SC section accommodating 14 β_(g)=0.12 single spoke cavities,14 SC solenoids,and 14 cold beam position monitors(BPMs).A 10-MeV pulsed beam with a beam current of 10 mA and a 2-mA continuous wave(CW)beam were successfully shooting through.The commissioning results confirmed the feasibility of using a 325-MHz spoke-type cavity for accelerating the proton beam in the low β and medium β sections.This paper describes the results achieved,the difficulties encountered,and the experiences obtained during commissioning.
文摘Background The Beijing Electron Positron Collider(BEPCII)is a high-brightness collider and operates in compatible mode of synchronous light source.This summer,BEPCII spare cavity,which was all made in China,had been put into BEPCII operation,and the LLRF system for the spare cavity was also upgraded at the time.Purpose The purpose is to stably control the amplitude and phase of the spare cavity and apply digital technology to achieve some intelligent functions.Methods The digital method is applied in the superconducting cavity feedback control of the accelerator and it introduces the digital technology of the RF low-level control system that has been stably applied to the BEPCII spare cavity operation.In addition,some functions such as quench detector and input protection as well as horizontal test have been realized in the RF system operation.Results The amplitude and phase stabilities of cavity voltage with beam in the digital LLRF have reached±0.09%(RMS)and±0.055°(RMS),respectively.Conclusion The BEPCII spare cavity with digital LLRF system has been stably operated for 2 months.The DLLRF system has been reliable and stable,and the performance of the spare cavity with beam was very good.
