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

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

doi:10.1143/JJAP.24.849

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

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

Division of Nuclear Fusion Dynamics

Research output: Contribution to journal › Article › peer-review

12 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 n_c 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 language	English
Pages (from-to)	849-855
Number of pages	7
Journal	Japanese Journal of Applied Physics
Volume	24
Issue number	7 R
DOIs	https://doi.org/10.1143/JJAP.24.849
Publication status	Published - Jul 1985

All Science Journal Classification (ASJC) codes

Engineering(all)
Physics and Astronomy(all)

Access to Document

10.1143/JJAP.24.849

Cite this

@article{ed610b1b88454752879d78ea4877f3ab,

title = "Analysis of optimal feedback control of vertical plasma position in a tokamak system",

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.",

author = "Moriyama, {Shin Ichi} and Kazuo Nakamura and Yukio Nakamura and Satoshi Itoh",

year = "1985",

month = jul,

doi = "10.1143/JJAP.24.849",

language = "English",

volume = "24",

pages = "849--855",

journal = "Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes",

issn = "0021-4922",

publisher = "Institute of Physics",

number = "7 R",

}

TY - JOUR

T1 - Analysis of optimal feedback control of vertical plasma position in a tokamak system

AU - Moriyama, Shin Ichi

AU - Nakamura, Kazuo

AU - Nakamura, Yukio

AU - Itoh, Satoshi

PY - 1985/7

Y1 - 1985/7

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=0022100968&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0022100968&partnerID=8YFLogxK

U2 - 10.1143/JJAP.24.849

DO - 10.1143/JJAP.24.849

M3 - Article

AN - SCOPUS:0022100968

SN - 0021-4922

VL - 24

SP - 849

EP - 855

JO - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes

JF - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes

IS - 7 R

ER -

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

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this