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Drift Mode Calculations for the Large Helical Device
Authors: G. Rewoldt, L.-P. Ku, W.M. Tang, H. Sugama, N. Nakajima, K.Y. Watanabe, S. Murakami, H. Yamada, and W.A. Cooper
Date of PPPL Report: June 2000
Published in: Phys. Plasmas 7 (December 2000) 4942-4947.
A fully kinetic assessment of the stability properties of toroidal drift modes has been obtained for a case for the Large Helical Device (LHD) [A. Iiyoshi, et al., Plasma Physics and Controlled Nuclear Fusion Research, 1998, Nucl. Fusion 39, 1245 (1999)]. This calculation retains the important effects in the linearized gyrokinetic equation, using the lowest-order "ballooning representation" for high toroidal mode number instabilities in the electrostatic limit. Results for toroidal drift waves destabilized by trapped particle dynamics and ion temperature gradients are presented, using three-dimensional magnetohydrodynamics equilibria reconstructed from experimental measurements. The effects of helically-trapped particles and helical curvature are investigated.
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