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Slow-wave propagation and sheath interaction in the ion-cyclotron frequency range

J R Myra, D A DIppolito2010年Plasma Physics and Controlled FusionIF 2.2出版社

In previous work (Myra J R and D'Ippolito D A 2008 Phys. Rev. Lett.101 195004) we studied the propagation of slow-wave (SW) resonance cones launched parasitically by a fast-wave antenna into a tenuous magnetized plasma. Here we extend the treatment of SW propagation and sheath interaction to 'dense' scrape-off-layer plasmas where the usual cold-plasma SW is evanescent. Using the sheath boundary condition, it is shown that for sufficiently close limiters, the SW couples to a sheath–plasma wave and is no longer evanescent, but radially propagating. A self-consistent calculation of the rf-sheath width yields the resulting sheath voltage in terms of the amplitude of the launched SW, plasma parameters and connection length. The conditions for avoiding potentially deleterious rf-wall interactions in tokamak rf heating experiments are summarized.

日本語訳

以前の研究(Myra J R and D'Ippolito D A 2008 Phys. Rev. Lett.101 195004)において、我々は高速波アンテナによって寄生励起された遅波(SW)共鳴コーンの、希薄な磁化プラズマ中での伝播を研究した。ここでは、SWの伝播とシース相互作用の取り扱いを、通常の冷プラズマSWが減衰する「高密度」スクレイプオフ層プラズマへと拡張する。シース境界条件を用いることにより、リミッターが十分に近接している場合、SWはシース・プラズマ波と結合し、もはや減衰せず、径方向に伝播することが示される。rfシース幅の自己無撞着計算により、結果として生じるシース電圧が、励起されたSWの振幅、プラズマパラメータ、および結合長の関数として得られる。トカマクrf加熱実験において潜在的に有害なrf-壁相互作用を回避するための条件が要約される。

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