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Report No.

Status of 3 MeV beam scrapers for the J-PARC LINAC

Hirano, Koichiro; Sugimura, Takashi*; Kurihara, Toshikazu*

We could use a 3 MeV beam scraper without a problem for five months when the scraper received to 1.3 times as high as a normal average beam current of the scraper in 1MW beam operation. The peak temperature on the scraper surface was 1800$$^{circ}$$C. Irradiation damage caused by the 3 MeV beam with particle number of 3E22 was 700 $$mu$$m depth. We study scraper materials which can withstand the current density higher than carbon composite used in the scraper because almost all beams can be irradiated to the scraper in 1 MW beam operation. Beam irradiation tests have been performed about graphene and tungsten as scraper materials with high heat conductivity. This paper describes beam irradiation test of the 3 MeV beam scraper and scraper materials.



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