Removal of stripped protons produced in low-energy beam transport for superconducting linac
Hui Liao, Weidong Chen, Hui Li, Benzheng Chen, Yongchuan Xiao, Yongjia Lv, Xiuxia Cao, Shengjin Liu, Jun Peng, Xinyuan Feng, Shunming Liu
DOI 10.1103/PhysRevAccelBeams.28.023502 · Physical Review Accelerators and Beams
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Abstract
Superconducting linear accelerator (SCL) is commonly used to boost the negative hydrogen ion (H−) beam energy above the medium-β range. Stripped proton beam loss in SCL is one of the heat and radioactive source, which could threaten the operation of the SCL. This paper describes a novel technique for removing stripped protons produced in the low-energy beam transport section, the main area of H− beam stripping in the linac. The experiment is conducted at the China Spallation Neutron Source. The H− beam is bent by 1.8° before being focused into the radio-frequency quadrupole (RFQ) entrance. As a result of the differential pumping and optimized beam optics design, the bending magnet effectively removes over 99% of the stripped protons, resulting in a significant reduction of stripped protons captured by the RFQ and downstream linac.
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