Stabilization of the resistive shell mode in tokamaks

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The stability of current-driven external-kink modes is investigated in a tokamak plasma surrounded by an external shell of finite electrical conductivity. According to conventional theory, the ideal mode can be stabilized by placing the shell sufficiently close to the plasma, but the non-rotating ``resistive shell mode,`` which grows on the characteristic L/R time of the shell, always persists. It is demonstrated, using both analytic and numerical techniques, that a combination of strong edge plasma rotation and dissipation somewhere inside the plasma is capable of stabilizing the resistive shell mode. This stabilization mechanism does not necessarily depend on toroidicity or presence ... continued below

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56 p.

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Fitzpatrick, R. & Aydemir, A. February 1, 1995.

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Description

The stability of current-driven external-kink modes is investigated in a tokamak plasma surrounded by an external shell of finite electrical conductivity. According to conventional theory, the ideal mode can be stabilized by placing the shell sufficiently close to the plasma, but the non-rotating ``resistive shell mode,`` which grows on the characteristic L/R time of the shell, always persists. It is demonstrated, using both analytic and numerical techniques, that a combination of strong edge plasma rotation and dissipation somewhere inside the plasma is capable of stabilizing the resistive shell mode. This stabilization mechanism does not necessarily depend on toroidicity or presence of resonant surfaces inside the plasma.

Physical Description

56 p.

Notes

INIS; OSTI as DE95008748

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  • Other Information: PBD: Feb 1995

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  • Other: DE95008748
  • Report No.: DOE/ET/53088--694
  • Report No.: IFSR--694
  • Grant Number: FG05-80ET53088
  • DOI: 10.2172/41375 | External Link
  • Office of Scientific & Technical Information Report Number: 41375
  • Archival Resource Key: ark:/67531/metadc686822

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  • February 1, 1995

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  • July 25, 2015, 2:20 a.m.

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  • Aug. 10, 2016, 2:15 p.m.

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Fitzpatrick, R. & Aydemir, A. Stabilization of the resistive shell mode in tokamaks, report, February 1, 1995; Austin, Texas. (digital.library.unt.edu/ark:/67531/metadc686822/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.