Observation and control of resistive wall modes

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Two approaches to achieving long-time scale stabilization of the ideal kink mode with a real, finite conductivity wall are considered: plasma rotation and active feedback control, DIII-D experiments have demonstrated stabilization of the resistive wall mode (RWM) by sustaining beta greater than the no-wall limit for up to 200 ms, much longer than the wall penetration time of a few ms. These plasmas are typically terminated by an m = 3, n = 1 mode as the plasma rotation slows below a few kHz. Recent temperature profile data shows an ideal MHD mode structure, as expected for the resistive wall ... continued below

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18 p.

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Strait, E. J.; Garofalo, A. M. & Austin, M. E. December 1998.

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Description

Two approaches to achieving long-time scale stabilization of the ideal kink mode with a real, finite conductivity wall are considered: plasma rotation and active feedback control, DIII-D experiments have demonstrated stabilization of the resistive wall mode (RWM) by sustaining beta greater than the no-wall limit for up to 200 ms, much longer than the wall penetration time of a few ms. These plasmas are typically terminated by an m = 3, n = 1 mode as the plasma rotation slows below a few kHz. Recent temperature profile data shows an ideal MHD mode structure, as expected for the resistive wall mode at beta above the no-wall limit. The critical rotation rate for stabilization is in qualitative agreement with recent theories for dissipative stabilization in the absence of magnetic islands. However, drag by small-amplitude RWMs or damping of stable RWMs may contribute to an observed slowing of rotation at high beta, rendering rotational stabilization more difficult. An initial open-loop active control experiment, using non-axisymmetric external coils and a new array of saddle loop detectors, has yielded encouraging results, delaying the onset of the RWM.

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18 p.

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INIS; OSTI as DE99001355

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  • 17. IAEA fusion energy conference, Yokohama (Japan), 19-24 Oct 1998

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  • Other: DE99001355
  • Report No.: GA--A22994
  • Report No.: CONF-981064--
  • Grant Number: AC03-89ER51114;AC02-76CH03073;AC05-96OR22464;W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 296840
  • Archival Resource Key: ark:/67531/metadc685368

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

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  • December 1998

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  • July 25, 2015, 2:20 a.m.

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  • Jan. 8, 2018, 3:23 p.m.

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Strait, E. J.; Garofalo, A. M. & Austin, M. E. Observation and control of resistive wall modes, article, December 1998; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc685368/: accessed July 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.