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JAEA Reports

Work and safety managements for on-site installation, commissioning, tests by EU of quench protection circuits for JT-60SA

Yamauchi, Kunihito; Okano, Jun; Shimada, Katsuhiro; Omori, Yoshikazu; Terakado, Tsunehisa; Matsukawa, Makoto; Koide, Yoshihiko; Kobayashi, Kazuhiro; Ikeda, Yoshitaka; Fukumoto, Masahiro; et al.

JAEA-Technology 2015-053, 36 Pages, 2016/03

JAEA-Technology-2015-053.pdf:8.33MB

The superconducting Satellite Tokamak machine "JT-60SA" under construction in Naka Fusion Institute is an international collaborative project between Japan (JA) and Europe (EU). The contributions for this project are based on the supply of components, and thus European manufacturer shall conduct the installation, commissioning and tests on Naka site. This means that Japan Atomic Energy Agency (JAEA) had a quite difficult issue to manage the works by European workers and their safety although there is no direct contract. This report describes the approaches for the work and safety managements, which were agreed with EU after the tough negotiation, and then the completed on-site works for Quench Protection Circuits (QPC) as the first experience for EU in JT-60SA project. With the help of these approaches by JAEA, the EU works for QPC were successfully completed with no accident, and a great achievement was made for both EU and JA.

JAEA Reports

Initial design study of a DC power supply system for JT-60SA

Shimada, Katsuhiro; Omori, Yoshikazu; Okano, Jun; Matsukawa, Tatsuya; Terakado, Tsunehisa; Kurihara, Kenichi

JAEA-Technology 2008-031, 38 Pages, 2008/03

JAEA-Technology-2008-031.pdf:10.84MB

In JT-60SA, Toroidal Field coil (TF coil) and Poloidal Field coils (PF coils) are superconducting coils and a long-pulse plasma operation with more than 100s flattop is assumed. Corresponding to the superconducting TF and PF coils, new DC power supply system in JT-60SA is necessary. The DC power supply system is composed of the reused JT-60 power supply components and newly manufactured ones to reduce total cost. A quench protection circuit is newly introduced to fast discharge coil magnetic stored energy. This paper describes the initial design study of JT-60SA DC power supply system for TF and PF coils in Japan Atomic Energy Agency (JAEA).

Journal Articles

Trouble of a transformer with the no-voltage tap changer

Omori, Yoshikazu; Kurihara, Kenichi; Matsukawa, Makoto; Terakado, Tsunehisa; Furukawa, Hiroshi

Dai-17-Kai Bunshi Kagaku Kenkyusho Gijutsu Kenkyukai Hokokushu (CD-ROM), 4 Pages, 2006/03

no abstracts in English

Journal Articles

Highly polarized electrons from GaAs-GaAsP and InGaAs-AlGaAs strained-layer superlattice photocathodes

Nishitani, Tomohiro; Nakanishi, Tsutomu*; Yamamoto, Masahiro*; Okumi, Shoji*; Furuta, Fumio*; Miyamoto, Masaharu*; Kuwahara, Makoto*; Yamamoto, Naoto*; Naniwa, Kenichi*; Watanabe, Osamu*; et al.

Journal of Applied Physics, 97(9), p.094907_1 - 094907_6, 2005/05

 Times Cited Count:46 Percentile:15.38(Physics, Applied)

no abstracts in English

Journal Articles

A New intelligent coil current control system combined with a synchronous generator and a diode rectifier

Shimada, Katsuhiro; Omori, Yoshikazu; Furukawa, Hiroshi*; Terakado, Tsunehisa; Matsukawa, Makoto; Kurihara, Kenichi

Proceedings of International Conference on Electrical Engineering 2004 (ICEE 2004), p.777 - 781, 2004/00

We developed a new coil current control system for a power supply that consists of a synchronous generator and diode rectifiers. Test results are reported for the toroidal field coil power supply of JT-60, a world-class tokamak-type fusion device. This coil current control system has been designed to improve the control flexibility of the plasma discharge, and to introduce new functions. A state feedback control method is adopted to control coil current. Limit functions for the generator field current, the generator output voltage, and the toroidal field coil voltage have been added to the original coil current control system. Moreover, the abnormal state detection function of a coil is implemented for safety. The developed new intelligent control system has been tested and its performance was confirmed.

Journal Articles

Development and operational experiences of the JT-60U tokamak and power supplies

Hosogane, Nobuyuki; Ninomiya, Hiromasa; Matsukawa, Makoto; Ando, Toshiro; Neyatani, Yuzuru; Horiike, Hiroshi*; Sakurai, Shinji; Masaki, Kei; Yamamoto, Masahiro; Kodama, Kozo; et al.

Fusion Science and Technology (JT-60 Special Issue), 42(2-3), p.368 - 385, 2002/09

 Times Cited Count:2 Percentile:80.93(Nuclear Science & Technology)

This paper reviews developments of the JT-60U tokamak and coil power supplies and their operational experiences obtained to date. The JT-60U is a large tokamak upgraded from the original JT-60 to obtain high plasma current, large plasma volume and highly elongated divertor configurations. In the modification, all components inside the bore of toroidal magnetic field coils, a vacuum vessel, poloidal magnetic field coils (PF-coils), divertor etc., were renewed. Furthermore, boron carbide converted CFC tiles were used as divertor tiles to reduce erosion of carbon-base tiles. Later, a semi-closed divertor with pumps was installed in the replacement of the open divertor. Various technologies and ideas introduced to develop these components their operational experiences provide important data for designing future tokamaks. Also, major troubles that had influence on the JT-60U operations are described. As a maintenance issue for tokamaks using deuterium fueling gas, a method for reducing radiation exposure of in-vessel workers are introduced.

Journal Articles

A Long-term maintenance plan for the JT-60 power supply

Omori, Yoshikazu; Matsukawa, Makoto; Omori, Shunzo; Terakado, Tsunehisa; Okano, Jun; Noda, Masaaki*

NIFS-MEMO-36, p.358 - 361, 2002/06

no abstracts in English

Journal Articles

A Design study of the power supply system for superconducting JT-60

Matsukawa, Makoto; Ishida, Shinichi; Sakasai, Akira; Kurita, Genichi; Miura, Yushi; Terakado, Tsunehisa; Omori, Yoshikazu; Omori, Shunzo; Okano, Jun; Shimada, Katsuhiro; et al.

Fusion Technology, 39(2-Part2), p.1106 - 1110, 2001/03

no abstracts in English

Journal Articles

Improvement of the current control system for the JT-60 toroidal field coil

Omori, Yoshikazu; Matsukawa, Makoto; Totsuka, Toshiyuki; Furukawa, Hiroshi*

KEK Proceedings 99-16, p.361 - 364, 1999/11

no abstracts in English

JAEA Reports

Power loading on the beamline components and beam divergence of the negative-ion based NBI system for JT-60U

Hu, L.*; Akino, Noboru; Ebisawa, Noboru; Honda, Atsushi; Ito, Takao; Kawai, Mikito; Kazawa, Minoru; Kuriyama, Masaaki; Kusaka, Makoto*; Mogaki, Kazuhiko; et al.

JAERI-Tech 99-057, 16 Pages, 1999/08

JAERI-Tech-99-057.pdf:1.03MB

no abstracts in English

Journal Articles

Development of negative-ion based NBI system for JT-60

Kuriyama, Masaaki; Akino, Noboru; Ebisawa, Noboru; Grisham, L. R.*; Honda, Atsushi; H.Liquen*; Ito, Takao; Kawai, Mikito; Kazawa, Minoru; Mogaki, Kazuhiko; et al.

Journal of Nuclear Science and Technology, 35(11), p.739 - 749, 1998/11

 Times Cited Count:32 Percentile:7.97(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Progress of negative-ion based NBI system for JT-60U

Kuriyama, Masaaki; Akino, Noboru; Ebisawa, Noboru; Grisham, L. R.*; Honda, Atsushi; Ito, Takao; Kawai, Mikito; Kazawa, Minoru; Kusaka, Makoto*; H.Liquen*; et al.

Fusion Technology 1998, 1, p.391 - 394, 1998/00

no abstracts in English

Journal Articles

A New coil current control system of the JT-60 toroidal field coil power supply

Matsukawa, Makoto; Omori, Yoshikazu; Totsuka, Toshiyuki; Furukawa, Hiroshi*

Heisei-10-Nen Denki Gakkai Sangyo Oyo Bumon Zenkoku Taikai Koen Rombunshu, p.103 - 106, 1998/00

no abstracts in English

Journal Articles

High power beam operation with the negative-ion based NBI for JT-60U

Kuriyama, Masaaki; Akino, Noboru; Ebisawa, Noboru; Grisham, L. R.*; Hanada, Masaya; Honda, Atsushi; Ito, Takao; Kawai, Mikito; Kazawa, Minoru; *; et al.

Proc. of 17th IEEE/NPSS Symposium Fusion Engineering (SOFE'97), 1, p.405 - 408, 1998/00

no abstracts in English

Oral presentation

Operating experience with large flywheel motor-generators for JT-60 fusion device; The 20-year history and the troubles

Omori, Yoshikazu; Kurihara, Kenichi; Matsukawa, Makoto; Terakado, Tsunehisa; Okano, Jun; Furukawa, Hiroshi

no journal, , 

no abstracts in English

Oral presentation

Design study of the power supply system for JT-60SA

Shimada, Katsuhiro; Terakado, Tsunehisa; Omori, Yoshikazu; Okano, Jun; Furukawa, Hiroshi; Shibata, Kazuyuki; Terakado, Hiroyuki; Shibata, Takatoshi; Matsukawa, Makoto; Kurihara, Kenichi

no journal, , 

no abstracts in English

Oral presentation

Design study of high voltage power supply system for plasma breakdown/ramp-up in JT-60SA

Yamauchi, Kunihito; Shimada, Katsuhiro; Okano, Jun; Omori, Yoshikazu; Terakado, Tsunehisa; Kurihara, Kenichi

no journal, , 

no abstracts in English

Oral presentation

Design study of superconducting coil power supplies in JT-60SA

Shimada, Katsuhiro; Terakado, Tsunehisa; Omori, Yoshikazu; Okano, Jun; Yamauchi, Kunihito; Kurihara, Kenichi

no journal, , 

no abstracts in English

Oral presentation

Conceptual design status of the AC power system in JT-60SA

Matsukawa, Makoto; Shimada, Katsuhiro; Terakado, Tsunehisa; Yamauchi, Kunihito; Omori, Yoshikazu; Okano, Jun

no journal, , 

no abstracts in English

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