TITLE

Gyrokinetic microinstabilities in ASDEX Upgrade edge plasmas

AUTHOR(S)
Told, D.; Jenko, F.; Xanthopoulos, P.; Horton, L. D.; Wolfrum, E.
PUB. DATE
October 2008
SOURCE
Physics of Plasmas;Oct2008, Vol. 15 Issue 10, p102306
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Results of linear gyrokinetic simulations of ASDEX Upgrade [O. Gruber et al., Nucl. Fusion 39, 1321 (1999)] edge plasmas, with experimentally determined geometry and input parameters, are presented. It is found that in the near-edge region, microtearing modes can exist under conditions found in conventional tokamaks. As one enters the steep-gradient region, the growth rate spectrum is dominated—down to very low wavenumbers—by electron temperature gradient modes. The latter tend to peak near the X-point(s) and possess properties which may explain the ratios of the density and temperature gradient scale lengths that have been observed in various experiments over the last decade.
ACCESSION #
35103332

 

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