A four-vane radio-frequency quadrupole(RFQ)accelerator is under construction for the Compact Pulsed Hadron Source(CPHS)project at Tsinghua University.The 3 m-long RFQ will accelerate a 50 keV proton beam from the ECR ...A four-vane radio-frequency quadrupole(RFQ)accelerator is under construction for the Compact Pulsed Hadron Source(CPHS)project at Tsinghua University.The 3 m-long RFQ will accelerate a 50 keV proton beam from the ECR source to 3 MeV,and deliver it to the downstream drift tube linac(DTL)with a peak current of 50 mA,pulse length of 0.5 ms and beam duty factor of 2.5%.The inter-vane voltage is designed to increase with the longitudinal position to produce a short RFQ.Coupling plates are therefore not necessary.The cavity cross section and vane-tip geometry are tailored as a function of the longitudinal position,while limiting the peak surface electric field to 1.8 Kilpatrick.The RFQ is designed,manufactured,and installed at Tsinghua University.We also present the tuning and cold test results of the RFQ accelerator.After final tuning,the relative error of the quadrupole field is within 2%,and the admixture of the two dipole modes are less than 2%of the quadrupole mode.展开更多
A new RIB project, the Beijing Radioactive Ion-beam Facility （BRIF）, has been running at CIAE since 2004. In this project, a 100 MeV H-cyclotron, CYCIAE-100, is selected as the driving accelerator providing a 75-100...A new RIB project, the Beijing Radioactive Ion-beam Facility （BRIF）, has been running at CIAE since 2004. In this project, a 100 MeV H-cyclotron, CYCIAE-100, is selected as the driving accelerator providing a 75-100 MeV, 200-500 μA proton beam. An ISOL system employs two stage separators to reach the mass resolution of 20000. Its RIB beam will be injected into the existing Tandem and a superconducting booster installed down stream of the Tandem will increase the energy by 2 MeV/q. The progress of BRIF, giving special emphasis to CYCIAE-100, will be introduced in this paper.展开更多
基金the National Natural Science Foundation of China under Grant Nos 91126003 and 11175096.
文摘A four-vane radio-frequency quadrupole(RFQ)accelerator is under construction for the Compact Pulsed Hadron Source(CPHS)project at Tsinghua University.The 3 m-long RFQ will accelerate a 50 keV proton beam from the ECR source to 3 MeV,and deliver it to the downstream drift tube linac(DTL)with a peak current of 50 mA,pulse length of 0.5 ms and beam duty factor of 2.5%.The inter-vane voltage is designed to increase with the longitudinal position to produce a short RFQ.Coupling plates are therefore not necessary.The cavity cross section and vane-tip geometry are tailored as a function of the longitudinal position,while limiting the peak surface electric field to 1.8 Kilpatrick.The RFQ is designed,manufactured,and installed at Tsinghua University.We also present the tuning and cold test results of the RFQ accelerator.After final tuning,the relative error of the quadrupole field is within 2%,and the admixture of the two dipole modes are less than 2%of the quadrupole mode.
文摘A new RIB project, the Beijing Radioactive Ion-beam Facility （BRIF）, has been running at CIAE since 2004. In this project, a 100 MeV H-cyclotron, CYCIAE-100, is selected as the driving accelerator providing a 75-100 MeV, 200-500 μA proton beam. An ISOL system employs two stage separators to reach the mass resolution of 20000. Its RIB beam will be injected into the existing Tandem and a superconducting booster installed down stream of the Tandem will increase the energy by 2 MeV/q. The progress of BRIF, giving special emphasis to CYCIAE-100, will be introduced in this paper.
