Paper |
Title |
Page |
S12FC09 |
Very Fast Feedback Control of Coil-Current in JT-60 Tokamak |
442 |
|
- T. Aoyagi, Y. Matsuzaki, H. Nobusaka, M. Takahashi, T. Terakado, J. Yagyu
JAEA/NAKA, Ibaraki-ken, Japan
|
|
|
A direct digital control (DDC) system is adopted for controlling thyristor converters of power supplies in the JT-60 tokamak built in 1984. Microcomputers of the DDC were 5 MHz i8086 microprocessor and programs were written by assembler language and the processing time was under l ms. They were, however, too old in hardware and too complicated in software. New DDC system has been made in the JT-60 Upgrade (JT-60U) to control the power supplies more quickly under 0.25 and 0.5 ms of the processing time and also to write the programs used by high-level language. The new system consists of a host computer and five microcomputers with microprocessor on VMEbus system. The host computer AS3260 performs on-line processing such as setting the DDC under the discharge conditions and so on. Functions of the microcomputers with a 32-bit, 20 MHz microprocessor MC68030, whose OS are VxWorks and programs are written by C language, are real-time processing such as taking in instructions from a ZENKEI computer and in feedback control of currents and voltages of coils every 0.25 and 0.5 ms. The system is now operating very smoothly.
|
|
DOI • |
reference for this paper
※ doi:10.18429/JACoW-ICALEPCS1991-S12FC09
|
|
About • |
Received ※ 02 December 1991 — Accepted ※ 02 January 1992 — Issued ※ 04 December 1992 |
|
Cite • |
reference for this paper using
※ BibTeX,
※ LaTeX,
※ Text/Word,
※ RIS,
※ EndNote (xml)
|
|
|