Tuning and Cold Test of a Four-Vane RFQ with Ramped Inter-Vane Voltage for the Compact Pulsed Hadron Source
XING Qing-Zi1**, DU Lei1, ZHENG Shu-Xin1, GUAN Xia-Ling1, LI Jian2, CAI Jin-Chi1, GONG Cun-Kui1, WANG Xue-Wu1, TANG Chuan-Xiang1, James Billen3, James Stovall4, Lloyd Young5
1Key Laboratory of Particle & Radiation Imaging (Ministry of Education), Tsinghua University, Beijing 100084 2NUCTECH Co. Ltd., Beijing 100084 3905 Circle Drive, Los Alamos, NM 87544, USA 4Rutherford Appleton Laboratory, Harwell Oxford, Didcot OX11 0QX, UK 5LMY Technology, 1469 Plantation Circle, Lincolnton, GA 30817, USA
Abstract：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.
(Beam dynamics; collective effects and instabilities)
引用本文:
. [J]. 中国物理快报, 2013, 30(5): 52901-052901.
XING Qing-Zi, DU Lei, ZHENG Shu-Xin, GUAN Xia-Ling, LI Jian, CAI Jin-Chi, GONG Cun-Kui, WANG Xue-Wu, TANG Chuan-Xiang, James Billen, James Stovall, Lloyd Young. Tuning and Cold Test of a Four-Vane RFQ with Ramped Inter-Vane Voltage for the Compact Pulsed Hadron Source. Chin. Phys. Lett., 2013, 30(5): 52901-052901.
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2013, Vol. 30 
