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

Authors :
Yonekawa, I.
Kawamata, Y.
Totsuka, T.
Akasaka, H.
Sueoka, M.
Yoshida, H.
Source :
Fusion Engineering & Design. Jun2004, Vol. 71 Issue 1-4, p11-15. 5p.
Publication Year :
2004

Abstract

The JT-60U control system, composed of a UNIX-based workstation and a VME-bus system, has been successfully performing advanced plasma control for the JT-60U plasma discharges. Various hardware modifications and advanced plasma control algorithms have been continuously integrated into the JT-60U control system since its upgrade in 1991. The ZENKEI, the supervisory control system, has been entirely converted from its original 16-bit minicomputers and CAMAC system to the combination of a workstation and VME-bus system linked through an Ethernet network. The plasma equilibrium control system utilizes a full VME-bus system composed of three DEC alpha CPU modules that are currently running at control cycle times of 250 μs. The parameters for plasma equilibrium control are calculated by a newly developed real-time plasma shape calculation and reconstruction system. These parameters are fed to the plasma equilibrium control system synchronized by 250-μs clock pulses. To progress toward the advanced plasma control concept, which includes adoption of a global plasma parameter control algorithm and suppression of MHD instabilities, improvements were extensively consolidated into the plasma control system (PCS). Currently, additional modifications of the JT-60U control system have extended the pulse duration of the discharge without a major change in JT-60 equipment. [Copyright &y& Elsevier]

Details

Language :
English
ISSN :
09203796
Volume :
71
Issue :
1-4
Database :
Academic Search Index
Journal :
Fusion Engineering & Design
Publication Type :
Academic Journal
Accession number :
13624235
Full Text :
https://doi.org/10.1016/j.fusengdes.2004.04.003