HB2025 - the 71st ICFA Advanced Beam Dynamics workshop on High-Intensity and High-Brightness Hadron Beams

Beam loss mechanism by parasitic negative hydrogen in high power proton linac

THPT09

Oct 23, 2025, 3:30 PM

2h

third floor (conference center)

Poster Presentation WGB:Beam Dynamics in Linacs THPT poster session

Speaker

Duanyang Jia (Institute of Modern Physics, Chinese Academy of Sciences)

Description

Beam loss is the most critical topic in the high power accelerator community. During high power proton beam commissioning of Chinese ADS Front end (CAFe), unexpected irradiation dose was detected opposite to the proton beam deflection direction. This indicates there are parasitic negative hydrogen particles inside the proton beam, which is first observed in the linac facility. In the paper, regarding this beam loss phenomenon, a qualitative analysis and a quantitative analysis was conducted and finally verified this beam loss mechanism, which needs to be considered in the future design of high intensity and high power proton accelerators. Ultimately, several solutions are proposed for this beam loss mechanism.