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Collisionality dependence of shielding factor of beam driven current

ビーム駆動電流における遮蔽因子の衝突率依存性

本多 充; 菊池 満; 安積 正史*

Honda, Mitsuru; Kikuchi, Mitsuru; Azumi, Masafumi*

The collisionality dependence of a shielding factor of a neutral beam driven current, which is generally neglected for most models currently used, is shown to be important especially for present-day tokamak experiments. An addition of friction coefficients involving beam ions to the Matrix Inversion method based on the moment approach readily makes it possible to estimate the collisionality-dependent shielding factor. The models proposed coincide with the collisionless model in the collisionless limit. They clearly elucidate the strong dependence of the shielding factor on collisionality, indicating that using a collisionless model always overestimates a beam driven current.

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