Analysis of optimal feedback control of vertical plasma position in a tokamak system

Shin Ichi Moriyama, Kazuo Nakamura, Yukio Nakamura, Satoshi Itoh

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

An optimal control method was used to control the vertical position of a non-circular plasma with negative n-indices in a tokamak system. Taking the time delays in the control devices into consideration was found to improve the optimal feedback control law. Transient-response analysis of the control system in the TRIAM-1M tokamak showed that the optimal control technique can be used to control the plasma position in the stable region and that the ultimate lower limit of the n-index for the stabilization can be close to the limit nc for the fast-growing mode of positional instability. In addition, a pulsewidth-modulated inverter power supply with gate turn-off thyristors is proposed as a feedback power supply. This power supply has enabled the optimal position control of highly-elongated plasmas to be carried out an actual tokamak system.

Original languageEnglish
Pages (from-to)849-855
Number of pages7
JournalJapanese Journal of Applied Physics
Volume24
Issue number7 R
DOIs
Publication statusPublished - Jan 1 1985

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feedback control
Feedback control
power supplies
Plasmas
optimal control
thyristors
control equipment
transient response
Position control
Thyristors
time lag
Transient analysis
stabilization
Time delay
Stabilization
Feedback
Control systems

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Analysis of optimal feedback control of vertical plasma position in a tokamak system. / Moriyama, Shin Ichi; Nakamura, Kazuo; Nakamura, Yukio; Itoh, Satoshi.

In: Japanese Journal of Applied Physics, Vol. 24, No. 7 R, 01.01.1985, p. 849-855.

Research output: Contribution to journalArticle

Moriyama, Shin Ichi ; Nakamura, Kazuo ; Nakamura, Yukio ; Itoh, Satoshi. / Analysis of optimal feedback control of vertical plasma position in a tokamak system. In: Japanese Journal of Applied Physics. 1985 ; Vol. 24, No. 7 R. pp. 849-855.
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