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Cerenkov absorption of Alfvén waves and of fast magneto-acoustic waves in an inhomogeneous plasma

V.V. Dolgopolov, K.N. Stepanov1965年被引用 29Nuclear FusionIF 3出版社

We investigate Cerenkov electron absorption of low-frequency electromagnetic waves in an inhomogeneous plasma cylinder. Formulas were obtained for the energy absorbed by plasma, and for the damping factor where there is no resonance layer. A sharp boundary leads to a strong absorption increase. For a resonance layer containing a point at which the radial wave number becomes infinite, there occurs a strong absorption increase (if the phase velocity of the wave is the order of thermal-electron velocity, then the damping rate is the same order as the frequency). The radial and axial components of the electric field of the wave then increase sharply in the resonance layer. The increase in absorption is caused by the axial component of the electric field. Formulas were derived for the electric field strength inside the resonance layer, for the high-frequency power that is absorbed by the layer; and for the width of the layer.

日本語訳

我々は、不均一なプラズマ円筒内における低周波電磁波のチェレンコフ電子吸収を調査する。プラズマによって吸収されるエネルギー、および共鳴層が存在しない場合の減衰係数に対する公式が得られた。鋭い境界は強い吸収増加をもたらす。動径波数が無限大となる点を含む共鳴層に対しては、強い吸収増加が生じる(もし波の位相速度が熱電子速度の程度であれば、減衰率は周波数と同じ程度になる)。そのとき、波の電場の動径成分と軸方向成分は共鳴層内で急激に増加する。吸収の増加は電場の軸方向成分によって引き起こされる。共鳴層内部の電場強度、層によって吸収される高周波電力、および層の幅に対する公式が導出された。

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Fusion Advanced Studies TorusAlfvén wave
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