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

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 contro...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 1985-01, Vol.24 (7), p.849-855
Main Authors: MORIYAMA, S.-I, NAKAMURA, Y, NAKAMURA, V, ITOH, S
Format: Article
Language:English
Subjects:
Exact sciences and technology
Magnetic confinement and equilibrium
Physics
Physics of gases, plasmas and electric discharges
Physics of plasmas and electric discharges
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Summary: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.
ISSN:0021-4922
1347-4065
DOI:10.1143/jjap.24.849