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Report No.
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The Heat transfer analysis for a new large entry angled scraper for J-PARC Linac

Sugimura, Takashi*; Hirano, Koichiro  

The beam power of 1MW is a design specification of J-PARC. Therefore the beam current upgrade to 50 mA in the injector linac is indispensable. The scrapers installed in the linac have been took waste beam out of RFQ since last summer. They consist of Carbon composite surface plates and Copper block with cooling-water channel. The deterioration of thermal conducting has been observed during daily operation. Thus, a newly designed scraper with a large entry angle of 67 $$^{circ}$$ is introduced as countermeasures. This paper reports the results of numeric simulations of the new scrapers and their installation schedule.

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