NDLI: Optimal tuning of tokamak plasma equilibrium controllers in the presence of time delays

Content Provider	IEEE Xplore Digital Library
Author	Schuster, E. Sondak, D. Arastoo, R. Walker, M.L. Humphreys, D.A.
Copyright Year	2009
Description	Author affiliation: DIII-D tokamak, General Atomics, San Diego, California, USA (Walker, M.L.; Humphreys, D.A.) \|\| Department of Mechanical Engineering and Mechanics, Lehigh University, Bethlehem, PA 18015, USA (Schuster, E.; Sondak, D.; Arastoo, R.)
Abstract	When designing the control loops for tokamaks, it is important to acknowledge the effects of time delays. An assumption sometimes made for tokamaks having superconducting coils is that these extra time delays will not have any undesirable effects on control. In fact, introducing extra delays into the axisymmetric control loops of certain supercon-ducting tokamaks can have significant detrimental consequences. Aside from qualitative observations, the detrimental effects of extra time delays in tokamak control loops are not always well understood outside the control community. This study exposes and quantifies the detrimental effects imposed by time delays in the control loop in superconducting tokamaks, by focusing on plasma current control and radial position control in a vertically stable circular plasma in the KSTAR tokamak. Delays in the power supplies, data acquisition, and vessel structure are taken into account. Extremum-seeking-based optimal tuning of PID controllers is proposed as a possible method for remediating the negative effects of time delays. The Nyquist dual locus technique is employed to assess stability of the optimally tuned closed-loop system in the presence of time delays.
Starting Page	1188
Ending Page	1194
File Size	1370102
Page Count	7
File Format	PDF
ISBN	9781424446018
ISSN	10851992
DOI	10.1109/CCA.2009.5280942
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-07-08
Publisher Place	Russia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Tokamaks Optimal control Delay effects Superconducting coils Plasma stability Current control Position control Power supplies Data acquisition Three-term control
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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