Development of a Radio-Frequency Quadrupole Accelerator for the HL-2A/2M Tokamak Diagnostic System

Applied Sciences

Yaxia Wei¹  Pengfei Zheng¹  Shuli Gao²  Yuanrong Lu²  Yin Xia²  Shuo Liu²  Haipeng Li²  Zhi Wang²  Meiyun Han²  Tianhao Wei² 

[1] Southwestern Institute of Physics, Chengdu 610041, China;State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China;

关键词: beam dynamics;    RF conditioning;    beam commissioning;   

DOI  :  10.3390/app12084031

来源: DOAJ

【 摘 要 】

In order to figure out the migration and deposition of impurities on the first wall of HL-2A/2M tokamak, Peking University and Southwestern Institute of Physics are co-developing a deuteron RFQ as part of the in situ ion-beam diagnostic for the material. The RFQ, which operates at 162.5 MHz, is designed to accelerate a 10-mA deuteron beam from 40 keV up to 1.5 MeV. Key design considerations and the final design parameters are presented. The RFQ has been conditioned at a 1% duty factor for 80 h at RF cavity power of 55 kW. The specific shunt impedance of the cavity is 221 kΩ·m by measuring the bremsstrahlung spectrum. The intrinsic Q-value after the high-power tests measured by the Ring-Down method is 13,780. Beam commissioning has been taken place during the first half of 2021, and the beam measurements include beam current and energy of ²H⁺ ion. A 10 mA ²H⁺ beam was successfully accelerated through the RFQ.

【 授权许可】

Unknown