Global Alfven eigenmodes in WELDELSTEIN 7-AS

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In the presence of fast particle populations marginally stable global modes in the shear Alfven branch can be destabilized by wave particle resonances. This is particularly of concern in future large devices, where losses of resonant particles ({alpha}-particles in a reactor) may then limit the available heating power and also may cause damage of the first wall. In tokamaks TAE modes inside toroidicity induced gaps of the shear Alfven continua have been found. In stellarators with very weak shear like W7-AS low-n TAE-gaps do not occur but gaps below the shear Alfven continua with mode numbers m and n, if ... continued below

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5 p.

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Weller, A.; Goerner, C. & Jaenicke, R. September 1, 1995.

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In the presence of fast particle populations marginally stable global modes in the shear Alfven branch can be destabilized by wave particle resonances. This is particularly of concern in future large devices, where losses of resonant particles ({alpha}-particles in a reactor) may then limit the available heating power and also may cause damage of the first wall. In tokamaks TAE modes inside toroidicity induced gaps of the shear Alfven continua have been found. In stellarators with very weak shear like W7-AS low-n TAE-gaps do not occur but gaps below the shear Alfven continua with mode numbers m and n, if the resonant values {tau} = n/m do not exist in the plasma volume (k{sub {parallel}} = (m{sm_bullet}{tau} - n )/R {ne} 0 ). Under these conditions GAE modes with frequencies {omega}{sub GAE} < (k{sub {parallel}}{sm_bullet}V{sub A}){sub min} are the favoured modes. The investigation of GAE modes could also be of relevance in the case of advanced tokamak equilibria with flat or inverted q-profiles in the central region.

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5 p.

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INIS; OSTI as DE95017417

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  • International stellarator workshop, Madrid (Spain), 22-26 May 1995

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  • Other: DE95017417
  • Report No.: CONF-9505254--6
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 103512
  • Archival Resource Key: ark:/67531/metadc619318

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Office of Scientific & Technical Information Technical Reports

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  • September 1, 1995

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  • June 16, 2015, 7:43 a.m.

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  • Jan. 22, 2016, 11:12 a.m.

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Weller, A.; Goerner, C. & Jaenicke, R. Global Alfven eigenmodes in WELDELSTEIN 7-AS, article, September 1, 1995; Tennessee. (digital.library.unt.edu/ark:/67531/metadc619318/: accessed April 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.