Measurements of proton beam extinction at J-PARC

Koji Yoshimura, Y. Hashimoto, Y. Hori, Y. Sato, M. Shimamoto, Y. Takeda, M. Uota, Y. Igarashi, H. Nishiguchi, S. Mihara, M. Aoki, N. Nakadozono, T. Tachimoto

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

Proton beam extinction, defined as a residual to primary ratio of beam intensity, is one of the most important parameters to realize the future muon electron conversion experiment (COMET) proposed at J-PARC. To achieve the required extinction level of 10-9, we started measuring beam extinction at main ring (MR) as the first step. The newly developed beam monitor was installed into the abort beam line and the first measurement was successfully performed by using the fast-extracted MR beam. We found that empty RF buckets of RCS, which were considered to be swept away by the RF chopper, contained about 10-5 of the main beam pulse due to chopper inefficiency. We are now developing a new beam monitor with improved performance for further studies at the abort line. In addition, we have started new measurements at the different stage of proton acceleration, i.e. at Linac, 3-50 BT line, and the main ring. In this paper, we present recent results and future prospect of beam extinction measurements.

Original languageEnglish
Title of host publicationIPAC 2010 - 1st International Particle Accelerator Conference
Pages984-986
Number of pages3
Publication statusPublished - 2010
Externally publishedYes
Event1st International Particle Accelerator Conference, IPAC 2010 - Kyoto, Japan
Duration: May 23 2010May 28 2010

Other

Other1st International Particle Accelerator Conference, IPAC 2010
CountryJapan
CityKyoto
Period5/23/105/28/10

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proton beams
extinction
electric choppers
monitors
rings
buckets
muons
protons
pulses
electrons

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Yoshimura, K., Hashimoto, Y., Hori, Y., Sato, Y., Shimamoto, M., Takeda, Y., ... Tachimoto, T. (2010). Measurements of proton beam extinction at J-PARC. In IPAC 2010 - 1st International Particle Accelerator Conference (pp. 984-986)

Measurements of proton beam extinction at J-PARC. / Yoshimura, Koji; Hashimoto, Y.; Hori, Y.; Sato, Y.; Shimamoto, M.; Takeda, Y.; Uota, M.; Igarashi, Y.; Nishiguchi, H.; Mihara, S.; Aoki, M.; Nakadozono, N.; Tachimoto, T.

IPAC 2010 - 1st International Particle Accelerator Conference. 2010. p. 984-986.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Yoshimura, K, Hashimoto, Y, Hori, Y, Sato, Y, Shimamoto, M, Takeda, Y, Uota, M, Igarashi, Y, Nishiguchi, H, Mihara, S, Aoki, M, Nakadozono, N & Tachimoto, T 2010, Measurements of proton beam extinction at J-PARC. in IPAC 2010 - 1st International Particle Accelerator Conference. pp. 984-986, 1st International Particle Accelerator Conference, IPAC 2010, Kyoto, Japan, 5/23/10.
Yoshimura K, Hashimoto Y, Hori Y, Sato Y, Shimamoto M, Takeda Y et al. Measurements of proton beam extinction at J-PARC. In IPAC 2010 - 1st International Particle Accelerator Conference. 2010. p. 984-986
Yoshimura, Koji ; Hashimoto, Y. ; Hori, Y. ; Sato, Y. ; Shimamoto, M. ; Takeda, Y. ; Uota, M. ; Igarashi, Y. ; Nishiguchi, H. ; Mihara, S. ; Aoki, M. ; Nakadozono, N. ; Tachimoto, T. / Measurements of proton beam extinction at J-PARC. IPAC 2010 - 1st International Particle Accelerator Conference. 2010. pp. 984-986
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AU - Shimamoto, M.

AU - Takeda, Y.

AU - Uota, M.

AU - Igarashi, Y.

AU - Nishiguchi, H.

AU - Mihara, S.

AU - Aoki, M.

AU - Nakadozono, N.

AU - Tachimoto, T.

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AB - Proton beam extinction, defined as a residual to primary ratio of beam intensity, is one of the most important parameters to realize the future muon electron conversion experiment (COMET) proposed at J-PARC. To achieve the required extinction level of 10-9, we started measuring beam extinction at main ring (MR) as the first step. The newly developed beam monitor was installed into the abort beam line and the first measurement was successfully performed by using the fast-extracted MR beam. We found that empty RF buckets of RCS, which were considered to be swept away by the RF chopper, contained about 10-5 of the main beam pulse due to chopper inefficiency. We are now developing a new beam monitor with improved performance for further studies at the abort line. In addition, we have started new measurements at the different stage of proton acceleration, i.e. at Linac, 3-50 BT line, and the main ring. In this paper, we present recent results and future prospect of beam extinction measurements.

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