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Absorption of lower hybrid slow waves by fusion alpha particles

M. Spada, M. Bornatici, F. Engelmann1991年被引用 19Nuclear FusionIF 3出版社

The absorption of lower hybrid slow (LHS) waves in a thermonuclear plasma is investigated by accounting for both (self-consistent) quasi-linear electron Landau damping and (linear) absorption by fusion alpha particles. The full cold plasma wave dispersion properties are taken into account. A cylindrical geometry is adopted and it is assumed that the poloidal component of the wave vector can be disregarded. Analytical expressions for both absorption coefficients are presented, with emphasis on the case where the parallel refractive index of the LHS wave is near the accessibility value. In this case, electromagnetic effects are important. Numerical results for the profile of the radial power deposition on both electrons and alpha particles as well as the driven current density are given and discussed for parameters typical of a NET-like plasma. In particular, the fraction of the power absorbed by the alpha particles is evaluated. Conditions which ensure the absence of wave absorption by alpha particles are discussed.

日本語訳

熱核融合プラズマにおける低域混成遅波(LHS波)の吸収を、(自己無撞着な)準線形電子ランダウ減衰と核融合アルファ粒子による(線形)吸収の両方を考慮して調べる。完全な冷プラズマ波分散特性を考慮に入れる。円筒幾何学を採用し、波数ベクトルのポロイダル成分は無視できると仮定する。両方の吸収係数に対する解析的表現を示し、LHS波の平行屈折率が到達可能値に近い場合に重点を置く。この場合、電磁効果が重要である。電子とアルファ粒子の両方に対する径方向電力堆積プロファイル、および駆動電流密度の数値結果を、NET類似プラズマに典型的なパラメータについて示し、考察する。特に、アルファ粒子によって吸収される電力の割合を評価する。アルファ粒子による波の吸収が生じないことを保証する条件について考察する。

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