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The CSNS linac delivers a primary H⁻ beam to the RCS while also providing stripped proton beams generated through two mechanisms: foil stripping and intra-beam stripping. Carbon foil collimators selectively strip halo particles from the beam periphery, reducing the transverse emittance of the H⁻ beam, which allows a larger painting range during RCS injection and reduces beam loss. Intra-beam stripping is an unavoidable byproduct of high-intensity H⁻ transport whose effects will become more prominent at the higher beam power of the CSNS-II upgrade, and this work presents initial studies of its mechanisms. The intra-beam stripping generated proton beam has been used for detector calibration, while the higher-intensity foil-stripped proton beam can be used for isotope production. This work demonstrates a dual-beam operation design at the CSNS linac, turning stripped proton beams from a source of beam loss into new applications.
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