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.
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Research Article| October 17 2008
Gyrokinetic microinstabilities in ASDEX Upgrade edge plasmas
L. D. Horton;
D. Told, F. Jenko, P. Xanthopoulos, L. D. Horton, E. Wolfrum, ASDEX Upgrade Team; Gyrokinetic microinstabilities in ASDEX Upgrade edge plasmas. Phys. Plasmas 1 October 2008; 15 (10): 102306. https://doi.org/10.1063/1.3000132
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