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Journal Articles

Design study of the JT-60SA supervisory control system

Kawamata, Yoichi; Naito, Osamu; Kiyono, Kimihiro; Itami, Kiyoshi; Totsuka, Toshiyuki; Akasaka, Hiromi; Sueoka, Michiharu; Sato, Tomoki; Oshima, Takayuki; Sakata, Shinya; et al.

Fusion Engineering and Design, 83(2-3), p.198 - 201, 2008/04

 Times Cited Count:3 Percentile:24.84(Nuclear Science & Technology)

The design activity of JT-60SA (JT-60 Super Advanced) which is remodeled to a superconducting tokamak device has been starting under the JA-EU collaborative ITER-BA project. For the JT-60SA control system, the existing system should be reused as much as possible from the viewpoint of cost-effectiveness. We have just begun to discuss the configuration of the advanced Supervisory Control System (SVCS) including the following systems: (1) ultimately flexible real-time control system, (2) precise timing system enough to clarify cause and effect, and (3) safety shutdown control system. In this report, we present the design study of the JT-60SA SVCS with focusing on these systems.

Journal Articles

Development of timing signal generator for real-time control

Akasaka, Hiromi; Takano, Shoji; Sato, Tomoki; Kawamata, Yoichi

Heisei-18-Nendo Nagoya Daigaku Sogo Gijutsu Kenkyukai Kairo, Keisoku, Seigyo Gijutsu Kenkyukai Hokokushu, p.106 - 109, 2007/03

no abstracts in English

Journal Articles

Reconfiguration design of JT-60 timing system using FPGA

Akasaka, Hiromi; Takano, Shoji; Kawamata, Yoichi

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

no abstracts in English

Journal Articles

Reconfiguration study of the JT-60 timing system based on a fast shared memory network

Akasaka, Hiromi; Takano, Shoji*; Kawamata, Yoichi; Yonekawa, Izuru

Heisei-16-Nendo Osaka Daigaku Sogo Gijutsu Kenkyukai Hokokushu (CD-ROM), 4 Pages, 2005/03

no abstracts in English

Journal Articles

Current status and future prospects of the JT-60U control system

Yonekawa, Izuru; Kawamata, Yoichi; Totsuka, Toshiyuki; Akasaka, Hiromi; Sueoka, Michiharu; Yoshida, Hidetoshi

Fusion Engineering and Design, 71(1-4), p.11 - 15, 2004/06

 Times Cited Count:5 Percentile:36.39(Nuclear Science & Technology)

The JT-60 control system based on workstation and VME-bus system features with UNIX system has been successfully performed at JT-60U advanced plasma experiment. The various hardware modifications and the adoption of the advanced plasma control algorithms have been continued to the JT-60 control system since its upgrade in 1991. The ZENKEI, supervisory control system, has entirely remodeled from its original 16 bits minicomputer and CAMAC system to the combination of workstation and VME-bus system configuration with Ethernet communication network system. The plasma control system executes real-time plasma equilibrium control command calculation within 250msec control cycle time. Each plant control subsystems are also modified along with same design concept to the ZENKEI. Currently, the minor modifications of the control system have been considered to realize longer pulse of discharge experiments without major change of the JT-60 equipment. Nearly 60 seconds of pulse length up to Ip=2MA, Bt=2T, PNBI=10MW($$sim$$30sec) plasma experiments will start from October in 2003.

Journal Articles

Developmental prototype for replacement of JT-60 timing system

Akasaka, Hiromi; Kawamata, Yoichi; Yonekawa, Izuru

Fusion Engineering and Design, 71(1-4), p.29 - 34, 2004/06

 Times Cited Count:2 Percentile:17.75(Nuclear Science & Technology)

The CAMAC hardware based timing system has been used to synchronizing pulse discharge sequential events and data collection of the interesting plasma phenomenon of the JT-60 plasma experiments. However, more flexible and intelligent timing system features with more state-of-the-art system is required corresponding to the increase of the requirement to realize more advanced plasma control and to minimize system maintenance cost. The combinations of the VME-bus system with high-speed data communication network by the reflective memory module and user-friendly application software based on MATLAB tools was selected for the new timing system. The new timing system provides the 50$$mu$$sec master clock, various timing signal preparation logic, which is built into DSP module conjunction with discharge sequence event. Except clock pulse generator (CPG) module, no other special hardware-timing module is necessary for the new timing system.

JAEA Reports

Development of plasma stored energy feedback control and its application to high performance discharges on JT-60U

Oikawa, Toshihiro; Tsuchiya, Katsuhiko; Kurihara, Kenichi; Kawamata, Yoichi; Fukuda, Takeshi*; Fujita, Takaaki; Akasaka, Hiromi; Yonekawa, Izuru; Neyatani, Yuzuru

JAERI-Research 2003-027, 19 Pages, 2003/12

JAERI-Research-2003-027.pdf:1.14MB

no abstracts in English

Journal Articles

Development of a new timing system prototype for JT-60, 2

Akasaka, Hiromi; Kawamata, Yoichi; Yonekawa, Izuru

Heisei-14-Nendo Tokyo Daigaku Sogo Gijutsu Kenkyukai Gijutsu Hokokushu, p.356 - 358, 2003/03

no abstracts in English

Journal Articles

JT-60 control system

Yonekawa, Izuru; Kawamata, Yoichi; Totsuka, Toshiyuki; Akasaka, Hiromi; Sueoka, Michiharu; Kurihara, Kenichi; Kimura, Toyoaki; JT-60U Team

Fusion Science and Technology (JT-60 Special Issue), 42(2-3), p.521 - 529, 2002/09

 Times Cited Count:5 Percentile:35.61(Nuclear Science & Technology)

The present status of JT-60 control system is reported including its original design concept, the progress of the system and various modifications since JT-60 upgrade. This control system has features of a functionally distributed and hierarchical structure, using CAMAC interfaces at the beginning, which are replaced to versatile module Europe (VME)-bus interfaces later, and a protective interlock system composed of both software and hard-wired interlock logics. Plant monitoring and control are performed by efficient data communication through CAMAC highways and Ethernet with TCP/IP protocols. Sequential control of a plasma discharges are executed by a combination of a remodeled VME-bus system and a timing system. At real-time plasma control system and a human interface system have been continuously modified corresponding to the progress of JT-60 experiments.

Journal Articles

Development of a new discharge control system for JT-60 with a UNIX workstation and a VME-bus system

Totsuka, Toshiyuki; Akasaka, Hiromi; Sueoka, Michiharu; Takano, Shoji*; Yonekawa, Izuru

Fusion Engineering and Design, 60(3), p.409 - 414, 2002/06

 Times Cited Count:2 Percentile:17.6(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Development of a new timing system for JT-60

Akasaka, Hiromi; Kawamata, Yoichi; Yonekawa, Izuru

NIFS-MEMO-36, p.424 - 427, 2002/06

no abstracts in English

Journal Articles

Development of a JT-60 protective interlock VME-bus system

Takano, Shoji*; Akasaka, Hiromi; Totsuka, Toshiyuki; Yonekawa, Izuru

NIFS-MEMO-36, p.443 - 446, 2002/06

no abstracts in English

JAEA Reports

Development of a new discharge control system utilizing UNIX workstations and VME-Bus systems for JT-60

Akasaka, Hiromi; Sueoka, Michiharu; Takano, Shoji*; Totsuka, Toshiyuki; Yonekawa, Izuru; Kurihara, Kenichi; Kimura, Toyoaki

JAERI-Tech 2001-087, 109 Pages, 2002/01

JAERI-Tech-2001-087.pdf:6.83MB

The JT-60 discharge control system had been used since the start of JT-60 experiment in 1985, was renewed in March, 2001. The new system consists of a UNIX workstation and a VME-bus system, and features a distributed control system. The workstation performs message communication with a VME-bus system and controllers of JT-60 sub-systems and data processing for discharge control. The VME-bus system performs discharge sequence control. The replacement has improved the control function and reliability of the discharge control system and also has provided sufficient performance necessary for future modifications of JT-60. The new system has been running successfully since April 2001. The data acquisition speed was confirmed to be twice faster than the previous one. This report describes major functions of the discharge control system, technical ideas for developing the system and results of the initial operation in detail.

Journal Articles

Remodeling of JT-60 discharge control system

Yonekawa, Izuru; Totsuka, Toshiyuki; Akasaka, Hiromi; Sueoka, Michiharu; Takano, Shoji*; Kurihara, Kenichi

Fusion Engineering and Design, 48(1-2), p.17 - 23, 2000/08

 Times Cited Count:3 Percentile:27.02(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Plasma real-time control system for advanced tokamak operation scenarios in JT-60

Kurihara, Kenichi; Kawamata, Yoichi; Akiba, K.*; Miura, Yushi; Akasaka, Hiromi; Adachi, H.*; Hoshi, Y.*; Fukuda, Takeshi; Oikawa, Toshihiro

IEEE Transactions on Nuclear Science, 47(2), p.205 - 209, 2000/04

no abstracts in English

Journal Articles

Feedback control of radiation region in radiative divertor plasma on JT-60U tokamak

Tamai, Hiroshi; Konoshima, Shigeru; Hosogane, Nobuyuki; Asakura, Nobuyuki; Sakata, Shinya; Saito, Naoyuki; *; Akasaka, Hiromi; Kawamata, Yoichi; Kurihara, Kenichi

Fusion Engineering and Design, 39-40, p.163 - 167, 1998/00

 Times Cited Count:9 Percentile:61.42(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Software engineering tool for sequential control of tokamak devices, II

Akasaka, Hiromi; Shimono, Mitsugu

Gijutsu Kenkyukai Hokoku (Mombusho Kokuritsu Temmondai, Denki Tsushin Daigaku), p.281 - 284, 1997/03

no abstracts in English

Journal Articles

Development of computer-aided software engineering tool for sequential control of JT-60U

Shimono, Mitsugu; Akasaka, Hiromi; Kurihara, Kenichi; Kimura, Toyoaki

16th IEEE/NPSS Symp. on Fusion Engineering (SOFE '95), 1, p.646 - 649, 1996/00

no abstracts in English

JAEA Reports

Tokamak plasma shape identification with a Legendre-Fourier expansion of the vacuum poloidal flux function in the toroidal coordinates

Kurihara, Kenichi; Kimura, Toyoaki; ; Kawamata, Yoichi; Sakata, Shinya; Akasaka, Hiromi

JAERI-M 90-001, 45 Pages, 1990/02

JAERI-M-90-001.pdf:1.84MB

no abstracts in English

Journal Articles

JT-60 Plasma Control System

Kurihara, Kenichi; Kimura, Toyoaki; Yonekawa, Izuru; ; Matsukawa, Makoto; ; Kawamata, Yoichi; Totsuka, Toshiyuki; Akasaka, Hiromi; Sakata, Shinya

Fusion Engineering and Design, 11, p.441 - 454, 1990/00

no abstracts in English

24 (Records 1-20 displayed on this page)