Toru Yanagibashi

Sustainment and Improvements on J-PARC RCS Vacuum System

Ippei Yamada, Junichiro Kamiya, Yuko Morohashi, Takamitsu Nakanoya et autres

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Vacuum Performance of Metal Additive Manufacturing Ti-6Al-4V UHV Chamber

J. Kamiya, Yuko Morohashi, Kenichiro Takeishi, Toru Yanagibashi

The vacuum performance of the Ti-6Al-4V vacuum chamber, which was produced by additive manufacturing (AM), was measured. It was shown that a 10－6 Pa ultra-high vacuum was achieved by exhausting with a turbomolecular pump. The residual gases in the AM chamber were …

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Surface Analysis and Vacuum Performance of BeCu Alloy Materials

Kaoru Wada, Toru Yanagibashi, T. Shiga, J. Kamiya et autres

BeCu material has the characteristics of high thermal conductivity and low thermal emissivity, which can reduce temperature rise. Furthermore, BeCu material is able to reduce the outgassing with the special heat treatment. These characteristics make it easier to get a high vacuum. …

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Evaluation of Vacuum Firing Effect on Stainless Steel from Vacuum and Surface Point of View

J. Kamiya, Kazuhiro Takano, Kaoru Wada, Toru Yanagibashi

Vacuum firing, which is a heat treatment at high temperature in a high vacuum furnace, is known as the method for the outgassing reduction of the vacuum materials, such as stainless steel, titanium, etc. The outgassing rate of the vacuum-fired stainless steel …

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Design and actual performance of J-PARC 3 GeV rapid cycling synchrotron for high-intensity operation

Kazami Yamamoto, Michikazu Kinsho, Naoki Hayashi, Pranab Kumar Saha et autres

In the Japan Proton Accelerator Research Complex, the purpose of the 3 GeV rapid cycling synchrotron (RCS) is to accelerate a 1 MW, high-intensity proton beam. To achieve beam operation at a repetition rate of 25 Hz at high intensities, the RCS …

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3GeVシンクロトロンビーム入射部における放射線遮蔽体の検討及び設置作業報告

Takamitsu Nakanoya, Junichiro Kamiya, Masahiro Yoshimoto, Tomohiro Takayanagi et autres

Since a user operation startup, the 3 GeV synchrotron accelerator (Rapid-Cycling Synchrotron: RCS) gradually reinforced the beam power. As a result, the surface dose rate of the apparatus located at the beam injection area of the RCS, such as the magnet, vacuum …

Improved vacuum system for high-power proton beam operation of the rapid cycling synchrotron

J. Kamiya, Hirofumi Kotoku, Syunta Kurosawa, Kazuhiro Takano et autres

The vacuum system in the rapid-cycling synchrotron of the Japan Proton Accelerator Research Complex has been operated for more than 10 years. It becomes evident that the high-power beam operation has more powerful effects on the vacuum system than expected at the …

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A Possible Modification of Ceramic Chambers in the Injection Area at the RCS in J-PARC

Yoshihiro Shobuda, K. Horino, J. Kamiya, Hirofumi Kotoku et autres

The J-PARC RCS is composed of ceramic chambers covered over copper stripes to suppress the eddy current on the chamber. The inductance, comprising the copper stripes and flanges, in combination with the capacitors makes an LCR electric circuit with the chamber and …

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New Design of Vacuum Chambers for Radiation Shield Installation at Beam Injection Area of J-PARC RCS

J. Kamiya, Yoshihiro Shobuda, Taisuke Takayanagi, Keiko Yamamoto et autres

Abstract One of the issues in the J-PARC 3 GeV rapid cycling synchrotron is the high residual radiation dose around the beam injection point. A radiation shield is necessary to reduce radiation exposure of workers when maintenance is performed there. A space …

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Activation in injection area of J-PARC 3-GeV rapid cycling synchrotron and its countermeasures

Kazami Yamamoto, E. Yamakawa, Taisuke Takayanagi, N. Miki et autres

Improvements of vacuum system in J-PARC 3 GeV synchrotron

J. Kamiya, Yusuke Hikichi, Y. Namekawa, Kenichiro Takeishi et autres

The RCS vacuum system has been upgraded since the completion of its construction towards the objectives of both better vacuum quality and higher reliability of the components. For the better vacuum quality, (1) pressure of the injection beam line was improved to …

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Thermal Desorption Characteristics of Several Charge Stripper Carbon Films for J-PARC RCS

J. Kamiya, Michikazu Kinsho, Yoshio Yamazaki, Masahiro Yoshimoto et autres

Multi-turn H− beam injection method is used in the J-PARC 3 GeV synchrotron to match the incident beam and the circulating beam. In this method, two electrons of the H− beam from the Linac are stripped by passing through the carbon thin …

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