JACoW is a publisher in Geneva, Switzerland that publishes the proceedings of accelerator conferences held around the world by an international collaboration of editors.
@inproceedings{aoyagi:icalepcs1991-s12fc09,
author = {T. Aoyagi and Y. Matsuzaki and H. Nobusaka and M. Takahashi and T. Terakado and J. Yagyu},
title = {{Very Fast Feedback Control of Coil-Current in JT-60 Tokamak}},
% booktitle = {Proc. ICALEPCS'91},
booktitle = {Proc. 3rd Int. Conf. Accel. Large Exp. Phys. Control Syst. (ICALEPCS'91)},
eventdate = {1991-11-11/1991-11-15},
pages = {442--445},
paper = {S12FC09},
language = {english},
keywords = {controls, power-supply, real-time, plasma, software},
venue = {Tsukuba, Japan},
series = {International Conference on Accelerator and Large Experimental Physics Control Systems},
number = {3},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {12},
year = {1992},
issn = {2226-0358},
isbn = {978-3-95450-254-7},
doi = {10.18429/JACoW-ICALEPCS1991-S12FC09},
url = {https://jacow.org/icalepcs1991/papers/s12fc09.pdf},
abstract = {{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.}},
}