Multivariable shape control development on the DIII-D tokamak

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In this paper, the authors describe recent work on plasma shape and position control at DIII-D. This control consists of two equally challenging problems--the problem of identifying what the plasma actually looks like in real time, i.e. measuring the parameters to be controlled, and the task of determining the feedback algorithm which best controls these plasma parameters in a multiple input-output system. Recent implementation of the EFIT plasma equilibrium reconstruction algorithm in real time code which produces a new equilibrium estimate every 1.5 ms seems to solve the longstanding problem of obtaining sufficiently accurate plasma shape and position estimation. Stabilization ... continued below

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5 p.

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Walker, M.L.; Humphreys, D.A. & Ferron, J.R. November 1, 1997.

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  • General Atomic Company
    Publisher Info: General Atomics, San Diego, CA (United States)
    Place of Publication: San Diego, California

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Description

In this paper, the authors describe recent work on plasma shape and position control at DIII-D. This control consists of two equally challenging problems--the problem of identifying what the plasma actually looks like in real time, i.e. measuring the parameters to be controlled, and the task of determining the feedback algorithm which best controls these plasma parameters in a multiple input-output system. Recent implementation of the EFIT plasma equilibrium reconstruction algorithm in real time code which produces a new equilibrium estimate every 1.5 ms seems to solve the longstanding problem of obtaining sufficiently accurate plasma shape and position estimation. Stabilization of the open-loop unstable vertical motion is also viewed as a solved problem. The primary remaining problem appears to be how best to command the power supplies to achieve a desired shaping control response. They will describe the effort to understand and apply linearized models of plasma evolution to development and implementation of multivariable plasma controllers.

Physical Description

5 p.

Notes

INIS; OSTI as DE98001833

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  • 17. IEEE/NPSS symposium on fusion engineering, San Diego, CA (United States), 6-10 Oct 1997

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  • Other: DE98001833
  • Report No.: GA--A22729
  • Report No.: CONF-971065--
  • Grant Number: AC03-89ER51114
  • Office of Scientific & Technical Information Report Number: 564224
  • Archival Resource Key: ark:/67531/metadc698563

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • November 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • April 18, 2016, 6:02 p.m.

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Walker, M.L.; Humphreys, D.A. & Ferron, J.R. Multivariable shape control development on the DIII-D tokamak, article, November 1, 1997; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc698563/: accessed June 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.