Study of the resistive wall mode in DIII-D

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Recent MHD calculations predict that, for a plasma with sufficient rotation, a resistive wall can provide stability up to the {beta}{sub N} limit predicted assuming the wall were ideal. In the region of {beta}{sub N} between the wall-at-infinity limit and the ideal-wall limit, an MHD instability branches into two modes: a plasma mode, that is nearly stationary with respect to the plasma at the resonant surface, and a resistive wall mode (RWM), that is nearly stationary with respect to the wall. Experiments conducted in the DIII-D, PBX-M and HBT-EP tokamaks have demonstrated that plasmas with a nearby conducting wall can ... continued below

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5 p.

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Garofalo, A. M.; Bialek, J. & Chu, M. S. July 1998.

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Recent MHD calculations predict that, for a plasma with sufficient rotation, a resistive wall can provide stability up to the {beta}{sub N} limit predicted assuming the wall were ideal. In the region of {beta}{sub N} between the wall-at-infinity limit and the ideal-wall limit, an MHD instability branches into two modes: a plasma mode, that is nearly stationary with respect to the plasma at the resonant surface, and a resistive wall mode (RWM), that is nearly stationary with respect to the wall. Experiments conducted in the DIII-D, PBX-M and HBT-EP tokamaks have demonstrated that plasmas with a nearby conducting wall can remain stable above the beta limit predicted with wall-at-infinity, and have reported observations of instabilities with the characteristics of a resistive wall mode. In the experiments described in this paper, improved diagnostic measurements and plasma operational techniques, giving broader current density profiles and high toroidal rotation, have provided direct identification of the resistive wall mode. These experiments were designed to ease the requirements on total beta in favor of maximizing the wall stability enhancement factor, E{sub W}, increasing the duration of the wall-stabilized phase, and ensuring shot-to-shot reproducibility with the available heating power.

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5 p.

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INIS; OSTI as DE98007299

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  • 25. European Physical Society conference on controlled fusion and plasma physics, Prague (Czech Republic), 29 Jun - 3 Jul 1998

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  • Other: DE98007299
  • Report No.: GA--A22921
  • Report No.: CONF-980678--
  • Grant Number: AC03-89ER51114;AC02-76CH03073;FG02-89ER53297;W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 639764
  • Archival Resource Key: ark:/67531/metadc697326

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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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  • July 1998

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  • Aug. 14, 2015, 8:43 a.m.

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  • Aug. 1, 2016, 6:40 p.m.

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Garofalo, A. M.; Bialek, J. & Chu, M. S. Study of the resistive wall mode in DIII-D, article, July 1998; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc697326/: accessed January 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.