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Fujiyama, Hiroki*; Takahashi, Hiroki; Okabe, Kota; Ito, Yuichi*; Hatakeyama, Shuichiro; Suzuki, Takahiro*; Otsu, Satoru*; Yamakawa, Ryuto*
Proceedings of 19th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.529 - 531, 2023/01
Stepper motors are used for mechanical drive in collimators and wire scanner monitors of J-PARC accelerators. Many of these drive unit hardware have been used since the beginning of J-PARC construction, and it is necessary to take measures against aging deterioration. Therefore, we started updating the motor and control system from around 2017. However, when the stepper motor was updated to the current product in the RCS H0 collimator, a malfunction occurred. This is because the drive unit control system cannot correctly recognize the state of the LS (limit switch) due to the noise generated by the motor driver, which hinders the operation. When the noise generated from the old and new stepper motors was measured in a simple test environment for confirmation, it was found that the current product was clearly larger. As a countermeasure, when the wiring of the stepper motor, which was bundled in a single multi-core cable, was separated into separate cables for the power system and LS signal system, the noise level was reduced to about 1/10 and normal operation was restored. I was able to. In this case, we report on noise countermeasures for the RCS H0 collimator drive unit.
Yamamoto, Kazami; Kinsho, Michikazu; Hayashi, Naoki; Saha, P. K.; Tamura, Fumihiko; Yamamoto, Masanobu; Tani, Norio; Takayanagi, Tomohiro; Kamiya, Junichiro; Shobuda, Yoshihiro; et al.
Journal of Nuclear Science and Technology, 59(9), p.1174 - 1205, 2022/09
Times Cited Count：7 Percentile：77.01(Nuclear Science & Technology)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 was elaborately designed. After starting the RCS operation, we carefully verified the validity of its design and made certain improvements to establish a reliable operation at higher power as possible. Consequently, we demonstrated beam operation at a high power, namely, 1 MW. We then summarized the design, actual performance, and improvements of the RCS to achieve a 1 MW beam.
Okabe, Kota; Yamamoto, Kazami; Kamiya, Junichiro; Takayanagi, Tomohiro; Yamamoto, Masanobu; Yoshimoto, Masahiro; Takeda, Osamu*; Horino, Koki*; Ueno, Tomoaki*; Yanagibashi, Toru*; et al.
Proceedings of 14th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.853 - 857, 2017/12
The most important issue is to reduce the uncontrolled beam loss in the high intensity hadron accelerator such as J-PARC proton accelerators. The J-PARC 3 GeV Synchrotron (RCS) has a collimator system which narrows a high intensity beam in the RCS. After startup of RCS in 2007, the collimator system of the RCS worked well. However, in April 2016, vacuum leakage at the collimator system occurred during the maintenance operation. To investigate a cause of the failure, we took apart iron shields of the collimator reducing exposed dose of operators. As a result of inspection, we succeeded to identify the cause of the vacuum leakage failure. In this presentation, we report the failure investigation of the beam collimator system in the RCS.
Okabe, Kazuhiko*; Shibata, Yasuhiro*; Mashimo, Toru*; Yuasa, Hisako*; Yamanaka, Hidetoshi*; Asano, Masaharu; Yoshida, Masaru
Drug Development and Industrial Pharmacy, 26(5), p.559 - 562, 2000/05
Times Cited Count：1 Percentile：5.60(Chemistry, Medicinal)no abstracts in English
crystalline films and bulk crystals by atomic force and scanning electron microscopiesTsunekawa, Shin*; Fukuda, Tsuguo*; Ozaki, Toru*; Yoneda, Yasuhiro; Okabe, Toru*; Terauchi, Hikaru*
Journal of Applied Physics, 84(2), p.999 - 1002, 1998/06
Times Cited Count：16 Percentile：59.16(Physics, Applied)no abstracts in English
Asano, Masaharu; Yoshida, Masaru; Omichi, Hideki; Okabe, Kazuhiko*; Mashimo, Toru*; Yuasa, Hisako*; Yamanaka, Hidetoshi*; Suzuki, K.*; ;
Pharm. Sci., 1, p.433 - 435, 1995/00
no abstracts in English
-acetoxy-6-chloro-2-oxa-4,6-pregnadiene-3,20-dione (TZP-4238), for local atrophic therapy of rat prostateOkabe, Kazuhiko*; ; ; Mashimo, Toru*; Yuasa, Hisako*; Yamanaka, Hidetoshi*; Asano, Masaharu; Omichi, Hideki; Yoshida, Masaru
Pharm. Sci., 1, p.307 - 309, 1995/00
no abstracts in English
Asano, Masaharu; Yoshida, Masaru; Omichi, Hideki; Mashimo, Toru*; Okabe, Kazuhiko*; Yuasa, Hisako*; Yamanaka, Hidetoshi*; Morimoto, Seiki*; Sakakibara, Hideo*
Biomaterials, 14(10), p.797 - 799, 1993/08
no abstracts in English
Asano, Masaharu; Yoshida, Masaru; Omichi, Hideki; Mashimo, Toru*; Okabe, Kazuhiko*; Yuasa, Hisako*; Yamanaka, Hidetoshi*; ; Sakakibara, Hideo*
Biomaterials, 14(10), p.797 - 799, 1993/00
Times Cited Count：22 Percentile：71.30(Engineering, Biomedical)no abstracts in English
