Observation of beam loss proton tracks at 400 MeV J-PARC Linac

Sako, Hiroyuki ; Miura, Akihiko ; Miyao, Tomoaki*; Maruta, Tomofumi*

In J-PARC Linac, from ACS to L3BT sections, highest beam loss was observed. This beam loss is considered to be caused mainly by $H^{0}$ generated by ionization of $H^{-}$ by residual gas in the beam duct. The $H^{0}$ is further changed to $H^{+}$ when penetrating the beam duct. We have developed a detector system consisting of 8 planes of scintillating fiber horoscopes. The upstream detector is separated from the downstream detector by about 1.2 m to measure time-of-flight of charged particles. Each detector can move in horizontal and vertical directions with stepping motors. We observed proton tracks due to beam loss for the first time at 400 MeV from April to June of 2017.

Language	:	English
Journal	:	Proceedings of 14th Annual Meeting of Particle Accelerator Society of Japan (Internet)
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Pages	:	p.545 - 547
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
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DOI for research data	:
Keywords	:	no keyword
Research Facility	:	J-PARC加速器
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Registration No. : BB20170975
JAEA Abstracts No. : 47000325
Paper Submission No. : 21002

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