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.

Language	:	Japanese
Journal	:	Proceedings of 14th Annual Meeting of Particle Accelerator Society of Japan (Internet)
Volume	:
Number	:
Pages	:	p.847 - 852
Publication Year/Month	:	2017/12
Meeting title	:	第14回日本加速器学会年会
Held date	:	2017/08
Location (city)	:	札幌
Location (country)	:	日本
Patent information	:
PDF	:
Paper URL	:	http://www.pasj.jp/web_publish/pasj2017/proceedings/PDF/WEP0/WEP020.pdf
DOI for research data	:
Keywords	:	ビームスクレーパ; リニアック
Research Facility	:	J-PARC加速器
Press Release	:
Article of JAEA R&D Review	:
Cooperating Institute	:

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Registration No. : BB20170833
JAEA Abstracts No. : 48001022
Paper Submission No. : 23290

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