The 32nd World Conference of the International Nuclear Target Development Society (INTDS2026)

Toward In-situ Temperature Diagnostics of Charge-Exchange Stripping Foils under High-Power Operation: Feasibility Study Based on Offline Experiments and Operational Experience at the J-PARC RCS.

31 Aug 2026, 16:40

20m

RIKEN Wako Campus

MOB2

Speaker

Masahiro Yoshimoto (Japan Atomic Energy Agency / J-PARC center)

Description

The J-PARC RCS has achieved 1 MW beam operation using pure carbon stripping foils instead of hybrid boron-doped carbon (HBC) foils. Although the temperature rise is estimated to be on the order of 1000 K under current conditions and does not yet limit operation, it is expected to become a critical factor for future higher-power upgrades.
　This study presents a feasibility study of temperature diagnostics using near-infrared (NIR) cameras, together with operational foil experience and temperature-rise simulations. For in-situ measurement, the existing foil observation system with quartz optics will be upgraded to integrate an NIR camera, since conventional mid-infrared diagnostics are not applicable. An offline test stand has also been developed to evaluate the performance of the NIR system. The test stand includes a carbon block heating device (~300°C) and a foil heating system via electron-beam irradiation (~50°C).
　The results demonstrate that NIR diagnostics provide a viable pathway toward in-situ temperature measurement under high-power operation.