Microinstability studies for the large helical device

doi:10.1088/0029-5515/42/9/301

2002-08-09

DOI：10.1088/0029-5515/42/9/301

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摘要

En 中文

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. The properties of the calculated linearly unstable modes are compared with the experimentally observed anomalous transport.

Keyword:

TEMPERATURE-GRADIENT MODES

STELLARATOR GEOMETRY

STABILITY

TRANSPORT

CONFINEMENT

EQUILIBRIA

PLASMAS

FIELDS

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Nuclear Fusion

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9.4K

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2.2W

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