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Description
To mitigate beam loss during RCS injection and in the transport line from the linac to the ring, a novel transverse beam halo collimation system was developed for the CSNS LRBT beamline. The system employs three sets of stripping foils arranged with a 60° phase shift, using twelve carbon foils to convert peripheral H⁻ ions with beam power below 2 kW into protons. Experimental results demonstrate that the collimators effectively reduce injection beam loss and contribute to RCS beam power enhancement. Moreover, the resulting proton beams enable medium-energy proton irradiation experiments and isotope production, thus achieving dual objectives of beam loss control and secondary beam utilization. This work demonstrates an effective approach for beam halo management in high-power proton accelerators.
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