IPAC2016 - List of Authors (Yamamoto, K.)

Paper	Title	Page
MOPOR004	Recent Progress of 1-MW Beam Tuning in the J-PARC 3-GeV RCS	592
	H. Hotchi, H. Harada, S. Kato, M. Kinsho, K. Okabe, P.K. Saha, Y. Shobuda, F. Tamura, N. Tani, Y. Watanabe, K. Yamamoto, M. Yoshimoto JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
	The J-PARC 3-GeV RCS started 1 MW beam test from October 2014, and successfully achieved a 1 MW beam acceleration in January 2015. Since then, a large fraction of our effort has been focused on reducing and managing beam losses. This paper presents the recent progress of 1 MW beam tuning, especially focusing on our approaches to beam loss issues, such as space-charge induced beam loss and foil scattering beam loss during charge-exchange injection, etc.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOR004
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WEPMR046	Thermal Analysis of the Injection Beam Dump at J-PARC RCS	2380
	J. Kamiya, M. Kinsho, P.K. Saha, K. Yamamoto JAEA/J-PARC, Tokai-mura, Japan
	In the J-PARC accelerator facility, 400 MeV H⁻ ions are injected from linac to rapid cycling synchrotron (RCS). A thin graphite foil with the thickness of about 300 ug/cm² is located at the injection point to strip two electrons from H⁻ ion and convert it to proton. The charge stripping efficiency is usually more than 99.7 %. In other words, less than 0.3 % H⁻ ions are not accurately exchanged to protons. Most of those remaining H⁻ ions or H⁰ atoms (stripped only one electron from H⁻ ion) are eventually converted to protons by second and third graphite foils and transported to the beam dump. This beam dump consists of an iron block with the size of 0.3×0.3×0.4 m3 for beam stop and the iron block with the size of 3×3×2.5 m3 and concrete with the size of 6×6×6 m3 around the iron block for the radiation shielding. The radiation shielding was designed to endure the 4 kW proton beam to the beam dump. In this presentation, we show the thermal analysis of the beam dump and compare it to the real operation.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMR046
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Recent Progress of 1-MW Beam Tuning in the J-PARC 3-GeV RCS

592

H. Hotchi, H. Harada, S. Kato, M. Kinsho, K. Okabe, P.K. Saha, Y. Shobuda, F. Tamura, N. Tani, Y. Watanabe, K. Yamamoto, M. Yoshimoto
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan

The J-PARC 3-GeV RCS started 1 MW beam test from October 2014, and successfully achieved a 1 MW beam acceleration in January 2015. Since then, a large fraction of our effort has been focused on reducing and managing beam losses. This paper presents the recent progress of 1 MW beam tuning, especially focusing on our approaches to beam loss issues, such as space-charge induced beam loss and foil scattering beam loss during charge-exchange injection, etc.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOR004

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPMR046

Thermal Analysis of the Injection Beam Dump at J-PARC RCS

2380

J. Kamiya, M. Kinsho, P.K. Saha, K. Yamamoto
JAEA/J-PARC, Tokai-mura, Japan

In the J-PARC accelerator facility, 400 MeV H⁻ ions are injected from linac to rapid cycling synchrotron (RCS). A thin graphite foil with the thickness of about 300 ug/cm² is located at the injection point to strip two electrons from H⁻ ion and convert it to proton. The charge stripping efficiency is usually more than 99.7 %. In other words, less than 0.3 % H⁻ ions are not accurately exchanged to protons. Most of those remaining H⁻ ions or H⁰ atoms (stripped only one electron from H⁻ ion) are eventually converted to protons by second and third graphite foils and transported to the beam dump. This beam dump consists of an iron block with the size of 0.3×0.3×0.4 m3 for beam stop and the iron block with the size of 3×3×2.5 m3 and concrete with the size of 6×6×6 m3 around the iron block for the radiation shielding. The radiation shielding was designed to endure the 4 kW proton beam to the beam dump. In this presentation, we show the thermal analysis of the beam dump and compare it to the real operation.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMR046

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)