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

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

https://doi.org/10.1016/j.fusengdes.2004.04.006

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 50sec 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.

Improvement on control system of the JT-60 radio frequency heating system

Shinozaki, Shinichi; Moriyama, Shinichi; Hiranai, Shinichi; Sato, Fumiaki*

JAERI-Tech 2003-032, 48 Pages, 2003/03

JAERI-Tech-2003-032.pdf:3.55MB

On the JT-60 radio frequency (RF) heating system, the decrease in the activity ratio was a problem because of the deterioration of the control system. To improve the reliability, we replaced CAMAC system for a power injection control system, which was a main cause of the trouble, with the microprocessor system. And, a function of computer supported programming function of RF power injection form was introduced, which contributed to reduce a load of operators. Furthermore, personal computers with network communication were introduced to improve a maintenance ability of the control system. As a result, the activity ratio of the RF heating system was improved significantly.

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

https://doi.org/10.13182/FST02-A244

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.

Recent changes of JT-60 data processing system

Matsuda, Toshiaki; Tsugita, Tomonori; Oshima, Takayuki; Sakata, Shinya; Sato, Minoru; Iwasaki, Keita*

Fusion Engineering and Design, 60(3), p.235 - 239, 2002/06

https://doi.org/10.1016/S0920-3796(02)00014-5

no abstracts in English

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

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.

Mass data acquisition systems in JT-60 data processing system

Oshima, Takayuki; Matsuda, Toshiaki; Tsugita, Tomonori; Sakata, Shinya; Sato, Minoru; Koiwa, Motonao*

Review of Scientific Instruments, 72(1), p.517 - 519, 2001/01

https://doi.org/10.1063/1.1319866

no abstracts in English

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

https://doi.org/10.1016/S0920-3796(00)00118-6

no abstracts in English

Control software of a variably polarizing undulator (APPLE type) for SX beamline in the SPring-8

Hiramatsu, Yoichi*; Shimada, Taihei*; Miyahara, Yoshikazu*

JAERI-Tech 99-082, p.274 - 0, 1999/12

JAERI-Tech-99-082.pdf:7.81MB

no abstracts in English