Commissioning experiences with the spoke-based CW superconducting proton linac

• Published in: Nuclear science and techniques 2021-10, Vol.32 (10), p.27-44, Article 105
• Main Authors: Yan, Fang, Geng, Hui-Ping, Meng, Cai, Zhao, Ya-Liang, Shi, Hua, Ouyang, Hua-Fu, Huang, Tong-Min, He, Fei-Si, Wang, Jian-Li, Ge, Rui, Sui, Yan-Feng, Ye, Qiang, Liu, Rong, Wang, Qun-Yao, Wang, Sheng-Chang, Cao, Jian-She, Pan, Wei-Min
• Format: Article
• Language: English
• Subjects: Beam Physics; Nuclear Energy; Particle Acceleration and Detection; Particle and Nuclear Physics; Physics; Physics and Astronomy
• ISSN: 1001-8042; 2210-3147
• DOI: 10.1007/s41365-021-00950-7

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 superconducting (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.