Microinstability Studies for the Large Helical Device | Zendy

G. Rewoldt | Zendy; L. P. Ku | Zendy; W. M. Tang | Zendy; H. Sugama | Zendy; N. Nakajima | Zendy; K. Y. Watanabe | Zendy; S. Murakami | Zendy; H. Yamada | Zendy; W.A. Cooper | Zendy

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Microinstability Studies for the Large Helical Device

Author(s) -

G. Rewoldt,

L. P. Ku,

W. M. Tang,

H. Sugama,

N. Nakajima,

K. Y. Watanabe,

S. Murakami,

H. Yamada,

W.A. Cooper

Publication year - 2002

Publication title -

osti oai (u.s. department of energy office of scientific and technical information)

Language(s) - English

Resource type - Reports

DOI - 10.2172/795722

Subject(s) - toroid , large helical device , physics , plasma , magnetohydrodynamics , ion , electron , instability , ballooning , stellarator , atomic physics , computational physics , kinetic energy , toroidal and poloidal , gyrokinetics , mechanics , stability (learning theory) , tokamak , classical mechanics , nuclear physics , quantum mechanics , machine learning , computer science

Fully kinetic assessments of the stability properties of toroidal drift modes have been obtained for cases for the Large Helical Device (LHD). This calculation employs the comprehensive linear microinstability code FULL, as recently extended for nonaxisymmetric systems. The code 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. These effects include trapped particles, FLR, transit and bounce and magnetic drift frequency resonances, etc., for any number of plasma species. Results for toroidal drift waves destabilized by trapped electrons and ion temperature gradients are presented, using numerically-calculated three-dimensional MHD equilibria. These are reconstructed from experimental measurements. Quasilinear fluxes of particles and energy for each species are also calculated. Pairs of LHD discharges with different magnetic axis positions and with and without pellet injection are compared

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