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Journal Articles

Development of semiconductor switches for high-power crowbar circuits

Ono, Ayato; Takayanagi, Tomohiro; Fuwa, Yasuhiro; Shinozaki, Shinichi; Ueno, Tomoaki*; Horino, Koki*; Sugita, Moe; Yamamoto, Kazami; Kinsho, Michikazu; Ikoma, Naoya*; et al.

Proceedings of 19th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.395 - 399, 2023/01

At J-PARC, an ignitron is used for the crowbar device of the klystron power supply for high-frequency acceleration of a linear accelerator. Ignitron uses mercury, which is of limited use worldwide, and is expected to be discontinued in the future. Therefore, we designed a semiconductor crowbar switch for short-circuit protection of klystron using a MOS gate thyristor. We have manufactured an oval-type board module that realizes an operating output of 3 kV, 40 kA, and 50 $$mu$$s per board. For the control power supply to each board module assuming a high voltage of 120 kV, we adopted a self-power supply method that creates a control power supply with a high-voltage DCDC converter from the voltage shared and charged by each board module. It was possible to confirm the operating performance on a 1/2 scale (60 kV, 40 kA) against the voltage of the existing equipment (120 kV, 40 kA) by connecting twenty oval board modules in series. The output test result will be reported.

Journal Articles

Semiconductor pulse power supplies for accelerators at J-PARC

Takayanagi, Tomohiro; Ono, Ayato; Fuwa, Yasuhiro; Shinozaki, Shinichi; Horino, Koki*; Ueno, Tomoaki*; Sugita, Moe; Yamamoto, Kazami; Oguri, Hidetomo; Kinsho, Michikazu; et al.

Proceedings of 19th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.242 - 246, 2023/01

At J-PARC, semiconductor short pulse power supplies to replace kicker power supplies and semiconductor long pulse power supplies to replace klystron power supply systems are under construction. We have fabricated a 40kV/2kA/1.2$$mu$$s unit power supply that employs a linear transformer drivers (LTD) system for kickers. Currently, we are working on a high voltage insulating cylinder insulator that suppresses corona discharges using only the insulator structure, without using insulating oil. In addition, the MARX system was adopted for klystron power supply system. A main circuit unit for 8kV/60A/830$$mu$$s rectangular pulse output and an 800V/60A correction circuit unit that improves the flat top droop from 10% to 1% were manufactured. Furthermore, a 2.2kV/2.4kW high voltage SiC inverter charger has been fabricated for this MARX power supply. The presentation will report the evaluation results of each test and prospects for semiconductor pulse power supplies.

Journal Articles

Construction of low-jitter circuit for new kicker power supply using next-generation power semiconductor

Oda, Kodai; Takayanagi, Tomohiro; Ono, Ayato; Horino, Koki*; Ueno, Tomoaki*; Sugita, Moe; Morishita, Takatoshi; Iinuma, Hiromi*; Tokuchi, Akira*; Kamezaki, Hiroaki*; et al.

Proceedings of 19th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.610 - 614, 2023/01

Kicker system is being used to kick the accelerated 3 GeV beam into the transport lines in RCS of J-PARC. The current kicker power supply applies thyratrons to discharge switches. We are developing a new kicker power supply using next-generation power semiconductors. The timing of the semiconductor switch operation is determined by the input of an external trigger signal. Large timing jitter causes unstable output pulses and beam loss due to beam orbit deviate from reference orbit. Therefore, a low jitter circuit that achieves high repeatability of 2 ns or less will be developed for the new kicker power supply. A prototype trigger generator has been fabricated, and jitter has been evaluated. The results of the evaluation test and the circuit configuration plan for reducing jitter will be reported.

Journal Articles

Development of a new power supply for the RCS kicker magnet with the LTD circuit of SiC-MOSFETs

Takayanagi, Tomohiro; Kinsho, Michikazu; Yamamoto, Kazami; Ueno, Tomoaki*; Horino, Koki*; Tokuchi, Akira*; Mushibe, Yoichi*

Proceedings of 14th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.45 - 49, 2017/12

J-PARC RCS needs updating of equipment after 10 years since the start of operation. Therefore, a pulse power supply applying a next generation semiconductor (SiC-MOSFET) with low switching loss and high breakdown voltage are investigated This supply constructs a serial / parallel multiplexing circuit using a SiC-MOSFET and a plurality of large capacity capacitors with one circuit board (LTD). By using this board as a main board and adopting a multistage hierarchical structure, it is possible to satisfy the specifications of the RCS kicker power supply with a voltage of 40 kV, a current of 4 kA and a rectangular wave pulse width of 1500 ns. Moreover, by adding a plurality of correction boards of 40 V and arbitrarily setting the operation trigger of the board, flatness correction is also possible. It was confirmed that the results of the preliminary test with the maximum output of 4 kV / 2 kA by are effective for maintaining stable operation at the RCS high intensity beam output.

Journal Articles

An Innovative high-power constant-current pulsed-arc power-supply for a high-density pulsed-arc-plasma ion-source using a LaB$$_{6}$$-filament

Ueno, Akira; Oguri, Hidetomo; Ikegami, Kiyoshi*; Namekawa, Yuya; Okoshi, Kiyonori; Tokuchi, Akira*

Review of Scientific Instruments, 81(2), p.02A718_1 - 02A718_3, 2010/02

 Times Cited Count:2 Percentile:13.42(Instruments & Instrumentation)

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