Removal of stripped protons produced in low-energy beam transport for superconducting linac

作者：Hui Liao, W. Chen, H. Li, Benzheng Chen, Yongchuan Xiao, Yongjia Lv, Xiuxia Cao, Shengjin Liu, Jun Peng, Xinyuan Feng, Shunming Liu · 发表于：Physical Review Accelerators and Beams · 年份：2025 · DOI：10.1103/physrevaccelbeams.28.023502 · 被引用次数：4 · 研究领域：Particle accelerators and beam dynamics、Particle Accelerators and Free-Electron Lasers、Magnetic confinement fusion research

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.