Suppression of beam loss at the bending magnet of the first arc in the J-PARC linac

Sako, Hiroyuki ; Ikegami, Masanori*

The highest beam loss in the J-PARC linac was observed at the first bending magnet in L3BT in the opposite side to H $^{-}$ deflection. A loss source candidate is H $^{+}$ ionized in LEBT. An H $^{+}$ peak was measured with a wire scanner monitor at MEBT1 by splitting H $^{+}$ and H $^{-}$ with steering magnets. H $^{+}$ is separated from H $^{-}$ beam with a horizontal steering magnet and a bending magnet at MEBT1 then H $^{+}$ is stopped by the scraper originally for beam chopping. The loss and radiations were reduced significantly while good chopping performance is kept.

Language	:	English
Journal	:	Proceedings of 6th Annual Meeting of Particle Accelerator Society of Japan (CD-ROM)
Volume	:
Number	:
Pages	:	p.217 - 219
Publication Year/Month	:	2010/03
Meeting title	:	第6回日本加速器学会年会
Held date	:	2009/08
Location (city)	:	東海
Location (country)	:	日本
Patent information	:
PDF	:
Paper URL	:	http://www.pasj.jp/web_publish/pasj6/papers/wpbta15.pdf
DOI for research data	:
Keywords	:	no keyword
Research Facility	:	J-PARC加速器
Press Release	:
Article of JAEA R&D Review	:
Cooperating Institute	:

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Registration No. : BB20091339
JAEA Abstracts No. : 38000813
Paper Submission No. : 7441

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