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Sugita, Moe; Takayanagi, Tomohiro; Ueno, Tomoaki*; Ono, Ayato; Horino, Koki*; Kinsho, Michikazu; Oguri, Hidetomo; Yamamoto, Kazami
Proceedings of 20th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.519 - 522, 2023/11
In J-PARC RCS, paint bump magnets are used to displace the beam orbit during paint injection, which produces a high intensity beam. A pattern of command current and command voltage can be used to create an output current waveform that varies the beam orbit over time. The accuracy of beam orbit control is determined by the shape difference between the command current and output current waveforms. In the current paint pattern adjustment, a deviation of 
1% or less is achieved by manual adjustment after using software that adjusts the pattern according to the response function of the power supply control. However, we would like to reduce the adjustment time. In addition, since the accuracy of paint injection is determined by the adjustment system of the paint magnet power supply, we would like to achieve output current deviation 10 times more precise than before to reduce beam loss. An analytical model of the load-side impedance is necessary to create a high-precision paint pattern, but it is very difficult to construct an analytical model because the load-side impedance changes in a time-varying nonlinear paint pattern. We used machine learning to adjust the output pattern of the paint pattern and achieved a deviation of less than 0.5% through repeated learning. This presentation will report on the current status of the system and its prospects.
Takayanagi, Tomohiro; Ueno, Tomoaki; Horino, Koki; Togashi, Tomohito; Tobita, Norimitsu*; Yamamoto, Kazami; Kinsho, Michikazu
Proceedings of 13th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.699 - 702, 2016/11
no abstracts in English
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; 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.
Yokota, Wataru; Saito, Yuichi; Nara, Takayuki; Ishii, Yasuyuki; Arakawa, Kazuo
Review of Scientific Instruments, 71(2), p.906 - 908, 2000/02
Times Cited Count：1 Percentile：20.04(Instruments & Instrumentation)no abstracts in English
Kabasawa, M.*; *; Harami, Taikan; Shimada, Taihei; ; Yokomizo, Hideaki
JAERI-M 89-109, 63 Pages, 1989/08
no abstracts in English
