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MHD surface waves in a resistive cylindrical plasma at low to ion cyclotron frequency

G A Collins, N F Cramer, I J Donnelly1984年Plasma Physics and Controlled FusionIF 2.2出版社

The first radial eigenmode of a nonaxisymmetric compressional wave in a cylindrical plasma surrounded by an insulating boundary is identified as a surface wave at low frequencies. The properties of these surface waves depend on the sign of the poloidal wavenumber m. For m positive there is a smooth change from surface wave behaviour at low frequencies to body wave behaviour at higher frequencies, typically around the ion cyclotron frequency. For m negative the wave has anomalous behaviour as it only exists below the ion cyclotron frequency and it resembles a torsional wave. The surface waves are first extensively analysed using a collisionless plasma model. Resistive effects are then included and are found to strongly modify the wave field profiles in a highly collisional plasma. Some comparison with experiment is given and further experiments are suggested.

日本語訳

非軸対称圧縮波の円柱プラズマにおける最初の動径固有モードは、絶縁境界に囲まれた低周波数領域において表面波として同定される。これらの表面波の特性は、ポロイダル波数mの符号に依存する。mが正の場合、低周波数における表面波の挙動から、より高周波数(典型的にはイオンサイクロトロン周波数付近)における体積波の挙動への滑らかな遷移が見られる。mが負の場合、この波は異常な挙動を示し、イオンサイクロトロン周波数以下でのみ存在してねじれ波に類似する。表面波はまず無衝突プラズマモデルを用いて詳細に解析される。その後、抵抗効果が考慮され、高衝突プラズマにおいて波動場のプロファイルが強く修正されることが示される。実験との比較が示され、さらなる実験が提案される。

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MagnetohydrodynamicsSurface waves
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