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Lu, K.; Takamizawa, Hisashi; Li, Y.; Masaki, Koichi*; Takagoshi, Daiki*; Nagai, Masaki*; Nannichi, Takashi*; Murakami, Kenta*; Kanto, Yasuhiro*; Yashirodai, Kenji*; et al.
Mechanical Engineering Journal (Internet), 10(4), p.22-00484_1 - 22-00484_13, 2023/08
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：6 Percentile：84.97(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.
Shobuda, Yoshihiro; Chin, Y. H.*; Hayashi, Naoki; Irie, Yoshiro*; Takayanagi, Tomohiro; Togashi, Tomohito; Toyama, Takeshi*; Yamamoto, Kazami; Yamamoto, Masanobu
Physical Review Accelerators and Beams (Internet), 21(6), p.061003_1 - 161003_15, 2018/06
Times Cited Count：4 Percentile：36.29(Physics, Nuclear)no abstracts in English
Ueda, Ryoshiro*; Sato, Katsuya; Hayashi, Hidenori*; Narumi, Issey*; Ono, Yutaka
JAEA-Review 2015-022, JAEA Takasaki Annual Report 2014, P. 101, 2016/02
Takayanagi, Tomohiro; Ueno, Tomoaki*; Horino, Koki; Tobita, Norimitsu; Hayashi, Naoki; Kinsho, Michikazu; Irie, Yoshiro*; Okabe, Kota; Tani, Norio; Naito, Shingo*; et al.
Proceedings of 12th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.1169 - 1174, 2015/09
The new injection bump power supply for the shift bump magnet of the beam injection sub-systems at the J-PARC (Japan Proton Accelerator Research Complex) 3-GeV RCS (Rapid Cycling Synchrotron) has been developed and manufactured. The power capacity of the new power supply was more than doubled with the injection beam energy upgrading of the LINAC (Linear Accelerator) from 181 MeV to 400 MeV. Furthermore, the low ripple noise on the output current was required to prevent the resonance of the RF shield loop at the ceramic duct with the excitation magnetic field. The power supply newly adopted a capacitor commutation method to form the trapezoid waveform pattern (bump waveform). This paper reports characteristic about the new power supply.
Takayanagi, Tomohiro; Hayashi, Naoki; Ueno, Tomoaki*; Horino, Koki; Okabe, Kota; Kinsho, Michikazu; Irie, Yoshiro*
Proceedings of 6th International Particle Accelerator Conference (IPAC '15) (Internet), p.2908 - 2910, 2015/06
The new injection bump power supply for the shift bump (SB) magnet of the beam injection system at the J-PARC (Japan Proton Accelerator Research Complex) 3-GeV RCS (Rapid-Cycling Synchrotron) has been developed and manufactured. The power capacity of the new power supply demand doubling with the injection beam energy upgrading of the LIANC (Linear Accelerator) from 181 MeV to 400 MeV. Furthermore, the low ripple noise on the output current was required to prevent the occurrence of the resonation between the excitation magnetic field and the RF shield loop covered the ceramics duct at the magnet. The power supply newly adopted a capacitor commutation method to form the trapezoid waveform pattern (bump waveform). This paper reports characteristic about the new shift bump power supply.
Ueda, Ryoshiro; Sato, Katsuya; Hayashi, Hidenori*; Narumi, Issey*; Ono, Yutaka
JAEA-Review 2014-050, JAEA Takasaki Annual Report 2013, P. 118, 2015/03
Masubuchi, Takashi*; Hyuga, Hirokazu*; Ueda, Ryoshiro; Hayashi, Hidenori*; Ikenaga, Hiroshi*; Sato, Katsuya; Ono, Yutaka
JAEA-Review 2014-050, JAEA Takasaki Annual Report 2013, P. 123, 2015/03
Horino, Koki; Takayanagi, Tomohiro; Ueno, Tomoaki; Hayashi, Naoki; Kinsho, Michikazu; Irie, Yoshiro*
Proceedings of 11th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.1143 - 1147, 2014/10
In 3-GeV RCS of J-PARC, the new shift bump power supply has been development and manufactured according to upgrading of 400 MeV injection beam energy of the LINAC. However, the trouble of the DC charger of the FT-unit, which did not occur in the factory, was frequent. Therefore, in user operation, the power supply was operated only with the R/F-unit without using the FT unit. As a result, the flat-top part of the bump waveform was to be a downward. The electrolytic capacitor of the R/F-unit can be not regenerated the energy of this flat top part and the operation time of the DC charger was became usually longer than time. The DC charger was overloaded and the temperature of the circuit parts was higher.
Takayanagi, Tomohiro; Ueno, Tomoaki; Horino, Koki; Hayashi, Naoki; Kinsho, Michikazu; Okabe, Kota; Irie, Yoshiro*
Proceedings of 11th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.1139 - 1142, 2014/10
The new shift bump (SB) power supply which doubled power supply capacity has been developed and manufactured according to upgrading of 400MeV injection beam energy of the LINAC (Linear accelerator) in J-PARC (Japan Proton Accelerator Research Complex) 3-GeV RCS (Rapid-Cycling Synchrotron). The power supply adopted a capacitor commutation method to form the trapezoid waveform pattern (bump waveform) by the IGBT (Insulated Gate Bipolar Transistor) switch. The test operation was started in January, 2014. However, the trouble of a diode in the FT-unit (Flat top unit) was frequent and the user operation of the J-PARC was started without the FT-unit. As a result, the flat-top part of the bump waveform was became a downward, and it has been to a formation defectiveness wave pattern. Therefore, using a horizontal paint bump magnet and a pulse steering magnet, the beam injection point of the RCS was fixed. This paper will be reported the characteristic, the trouble and the user operation about the new shift bump power supply.
Saha, P. K.; Harada, Hiroyuki; Hayashi, Naoki; Hotchi, Hideaki; Kinsho, Michikazu; Takayanagi, Tomohiro; Tani, Norio; Irie, Yoshiro*; Kato, Shinichi*
Proceedings of 4th International Particle Accelerator Conference (IPAC '13) (Internet), p.518 - 520, 2014/07
Hayashi, Naoki; Harada, Hiroyuki; Horino, Koki; Hotchi, Hideaki; Kamiya, Junichiro; Kinsho, Michikazu; Saha, P. K.; Shobuda, Yoshihiro; Takayanagi, Tomohiro; Tani, Norio; et al.
Proceedings of 4th International Particle Accelerator Conference (IPAC '13) (Internet), p.3833 - 3835, 2014/07
no abstracts in English
Takayanagi, Tomohiro; Hayashi, Naoki; Ueno, Tomoaki; Horino, Koki; Togashi, Tomohito; Kinsho, Michikazu; Watanabe, Yasuhiro; Irie, Yoshiro*
Proceedings of 4th International Particle Accelerator Conference (IPAC '13) (Internet), p.681 - 683, 2014/07
The power supply of the pulse steering magnet has been produced. The power supply has the equipment used to excite the pulse current and the direct-current (DC) to correspond to two modes that the painting injection for beam users and the central injection for beam commissioning. The pulse current has been performed with good accuracy whose deviation to a setting current becomes to be less than 0.2%. In case of the central injection, the power supply excites the current in DC mode, which has been realized the ripple current below 0.01%. This paper describes the design parameters and the experimental results of the power supply.
Hotchi, Hideaki; Harada, Hiroyuki; Hayashi, Naoki; Kinsho, Michikazu; Saha, P. K.; Shobuda, Yoshihiro; Tamura, Fumihiko; Yamamoto, Kazami; Yamamoto, Masanobu; Yoshimoto, Masahiro; et al.
Proceedings of 4th International Particle Accelerator Conference (IPAC '13) (Internet), p.3836 - 3838, 2014/07
In November 2012, we have performed a high intensity beam trial of up to 540 kW. The beam loss for 540 kW intensity beam was well reduced from 30% to 2% by injection painting. This remaining beam loss of 2%, arising from foil scattering and 100-kHz field ripple induced by injection bump field, corresponds to 650 W in power, which is still less than 1/6 of the current collimator capability of 4 kW. The numerical simulation well reproduced the experimental results. Accelerator modelling and quantitative benchmarking between experiment and numerical simulation becomes feasible. The numerical simulation very much helped us to understand the mechanism of observed beam loss. Also several beam loss mitigation ideas were proposed with a help of numerical simulation and verified by experiment.
Takayanagi, Tomohiro; Ueno, Tomoaki; Horino, Koki; Togashi, Tomohito; Hayashi, Naoki; Kinsho, Michikazu; Irie, Yoshiro*
IEEE Transactions on Applied Superconductivity, 24(3), p.3800905_1 - 3800905_5, 2014/06
Times Cited Count：4 Percentile：27.1(Engineering, Electrical & Electronic)Each pulse power supply of the bending magnets at the J-PARC 3-GeV RCS injection area has been designed and manufactured for the painting injection in the transverse plane. The shift bump and pulse steering magnets generate a trapezoidal waveform, the flat-top part of which is used for beam injection. The horizontal and vertical painting bump magnets dynamically change the beam orbit using a decaying waveform. The PFN switching capacitor system does not produce a current ripple at the flat top, although the IGBT chopping system cannot be free from ripple generation due to switching. However, the IGBT chopping system has an advantage of producing an arbitrary wave pattern as required. This paper summarizes the comparison of both power supply system from view point of the circuit structure, the switching noise and the control of the wave pattern formation.
Takayanagi, Tomohiro; Hayashi, Naoki; Kinsho, Michikazu; Ueno, Tomoaki; Togashi, Tomohito; Horino, Koki; Irie, Yoshiro*
IEEE Transactions on Applied Superconductivity, 24(3), p.0503504_1 - 0503504_4, 2014/06
Times Cited Count：6 Percentile：35.68(Engineering, Electrical & Electronic)New power supply of the injection shift bump magnet at the J-PARC 3-GeV RCS has been designed with the energy upgrading of LINAC to 400 MeV. The power supply is required to output the maximum current of 32 kA, which is 1.6 times the present current. Moreover, both current ripple noise and deviation should be less than 0.2% in a range from 10 kA to 32 kA output current. The IGBT chopping system as in the present power supply occurs the continuous current ripple due to the switching. So the circuit structure of the power supply has been changed from the IGBT chopping system to the PFN system by switching the capacitors. The power panel is comprised of 16 banks, each of which outputs 2 kA at 14 kV at maximum. More than four banks have been manufactured and the characteristics were evaluated in the factory. This paper summarizes the design and the experimental results of the new power supply.
Saha, P. K.; Yoshimoto, Masahiro; Yamazaki, Yoshio; Hotchi, Hideaki; Harada, Hiroyuki; Hayashi, Naoki; Yamamoto, Kazami; Kinsho, Michikazu; Irie, Yoshiro*
Journal of Radioanalytical and Nuclear Chemistry, 299(2), p.1041 - 1046, 2014/02
Times Cited Count：4 Percentile：30.92(Chemistry, Analytical)Saha, P. K.; Harada, Hiroyuki; Hayashi, Naoki; Horino, Koki; Hotchi, Hideaki; Kinsho, Michikazu; Takayanagi, Tomohiro; Tani, Norio; Togashi, Tomohito; Ueno, Tomoaki; et al.
Physical Review Special Topics; Accelerators and Beams, 16(12), p.120102_1 - 120102_11, 2013/12
Times Cited Count：4 Percentile：33.02(Physics, Nuclear)Shobuda, Yoshihiro; Hayashi, Naoki; Takayanagi, Tomohiro; Toyama, Takeshi*; Irie, Yoshiro*
Proceedings of 4th International Particle Accelerator Conference (IPAC '13) (Internet), p.1742 - 1744, 2013/05
Yoshimoto, Masahiro; Saha, P. K.; Yamazaki, Yoshio; Kawase, Masato; Saeki, Riuji; Hayashi, Naoki; Yamamoto, Kazami; Hotchi, Hideaki; Ishiyama, Tatsuya; Kinsho, Michikazu; et al.
Journal of Physics; Conference Series, 417, p.012073_1 - 012073_6, 2013/03
Times Cited Count：4 Percentile：75.73(Materials Science, Coatings & Films)The HBC foil are installed in the J-PARC RCS for the charge-exchange H
beam injection. In order to examine the characteristics of the HBC foils, beam studies for the HBC foil were carried out from the viewpoint of foil's life time and the beam survival rate due to foils. According to the compromise between charge-exchange efficiency and foil scattering beam loss, we optimized the foils thickness for user operation. The long-term observation during the user operation as well as the HBC foil endurance test for its life time evaluation was carried out. Even after one year was operation, there was no deterioration of the stripping foil.
