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Negative hydrogen ion beam irradiation experiments of beam scrapers using the J-PARC 3 MeV-Linac

Hirano, Koichiro  ; Ishiyama, Tatsuya; Kurihara, Toshikazu*; Sugimura, Takashi*; Maruta, Tomofumi*

Beam scrapers made of carbon composite have been used in the MEBT1 between a 324 MHz RFQ and a 50-MeV DTL of the J-PARC Linac. We have conducted the scraper irradiation test with the 3 MeV linac. The test piece of the scraper was irradiated by the H$$^{-}$$ beam up to particle number of 1.2E20. We measured the surface temperature of more than 3000$$^{circ}$$C using a high-speed radiation thermometer and observed the irradiation damage on the scraper by using the laser microscope. When the surface temperature exceeded 2900$$^{circ}$$C, the ionic current of carbon and the irradiation damage on the surface of the test piece rapidly increased. This paper describes beam irradiation test results of the scraper.

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