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Investigation of beam loss mechanism by parasitic H− in high-power proton linac

Duanyang Jia1,2,3, Zhijun Wang1,2,3,*, Huan Jia1,2,3, Bingyan Liu1,3, Man Yi1,3, Dalong Guo1,2, Hanjie Cai1,2,3, Weilong Chen1,2,3, Shuhui Liu1,2,3 et al.

Tielong Wang1,2,3, Tao Zhang1,2,3, and Yuan He1,2,3,†

  • *Contact author: wangzj@impcas.ac.cn
  • †Contact author: hey@impcas.ac.cn
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Phys. Rev. Accel. Beams 28, 090101 – Published 10 September, 2025

DOI: https://doi.org/10.1103/4tgj-mxmv

Abstract

Beam loss is the most critical topic in the high-power accelerator community. During high-power proton beam commissioning of Chinese ADS Front end, unexpected irradiation dose was detected opposite to the proton beam deflection direction. This indicates that there are parasitic H− particles inside the proton beam, which were first observed in the linac facility. In the paper, regarding this beam loss phenomenon, a qualitative analysis was carried out through nuclide analysis and was based on the theoretical foundation of molecular science. Moreover, a quantitative analysis was conducted through beam experiments, and finally verified this beam loss mechanism, which needs to be considered in the future design of high-intensity and high-power proton accelerators.

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Phys. Rev. Accel. Beams 28, 090101– Published 10 September, 2025
  • Received 25 January 2025
  • Accepted 6 August 2025
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