Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2018, Vol. 29 ›› Issue (10): 142 doi: 10.1007/s41365-018-0478-x

• LOW ENERGY ACCELERATOR, RAY AND APPLICATIONS • Previous Articles     Next Articles

RF tuning and beam commissioning of CW RFQ for China-ADS Injector-I

Hua Shi, Hua-Fu Ouyang, Sheng-Chang Wang, Ning-Chuang Zhou, Gang Wu   

  1. Key Laboratory of Particle Acceleration Physics and Technology, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  • Received:2018-02-08 Revised:2018-04-08 Accepted:2018-05-07
  • Contact: Hua Shi E-mail:shih@ihep.ac.cn
PDF ShareIt Export Citation
Hua Shi, Hua-Fu Ouyang, Sheng-Chang Wang, Ning-Chuang Zhou, Gang Wu. RF tuning and beam commissioning of CW RFQ for China-ADS Injector-I.Nuclear Science and Techniques, 2018, 29(10): 142     doi: 10.1007/s41365-018-0478-x
Citations
Altmetrics

Abstract:

A 325-MHz continuous-wave (CW) four-vane radiofrequency quadrupole (RFQ) is employed in Injector-I of the China Accelerator-Driven Subcritical System. The radiofrequency tuning and beam commissioning were performed from January 2014 to January 2017. In a cold test, a stability study showed that the design of the segmented resonantly coupling and dipole stabilizer rods can shift the harmful quadrupole and dipole mode from the fundamental mode to above 2.6 MHz. We also found a simplified tuning method for the field unflatness, involving changing the inserted length of a few plug tuners. For achieving CW-beam commissioning, two full-size RFQs were constructed successively. The commissioning results indicate that the beam transmission rate decreased by approximately 3% as the normalized field unflatness decreased by 1%. A 10-MeV CW proton beam with an average beam current of 2.1 mA was achieved at the target of Injector-I, and the output beam energy of the RFQ was 3.18 MeV.

Key words: RFQ, RF tuning, CW-beam commissioning, beam transmission rate