Speaker
Description
Stripper foils in high-intensity proton accelerators experience significant thermal loads during beam irradiation, causing deformation, degradation, and reduced lifetime. In the J-PARC Rapid Cycling Synchrotron (RCS), a carbon stripper foil is irradiated by a 400-MeV injecting H⁻ beam and the circulating proton beam, and simulations predict temperatures of up to about 1000 °C. Direct installation of an infrared (IR) camera near the foil is not feasible due to high radiation levels, so remote temperature monitoring is required.
The RCS currently uses a long-distance optical system with sapphire lenses to monitor foil motion. Sapphire lenses transmit poorly in the infrared, making conventional IR thermography impractical. To overcome this, we propose a near-infrared (NIR) camera compatible with the existing optical path.
To test feasibility, a test stand using an electron-beam irradiation device is being built to simulate localized foil heating. The preliminary design, expected performance, and current status of the test stand are presented. This study provides a foundation for in situ thermal diagnostics of stripper foils in the J-PARC RCS.
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