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Influence of collisional and radiative processes in the structure of a plasma focus current sheath

L Bilbao, H A Bruzzone, H J Kelly1985年Plasma Physics and Controlled FusionIF 2.2出版社

A five fluid MHD stationary model to describe the structure of the current sheath produced in plasma focus devices is presented. Electronic collisional excitation and ionization (with its respective inverse processes) has been included in the treatment and also radiative processes, but with the assumption that the current sheath becomes opaque to line radiation and transparent to continuous (free-free and free-bound) radiation. Numerical solutions of the equations are presented in terms of two parameters: the pressure of the neutral gas and the magnitude of the pushing magnetic field. For a given value of the magnetic field the results of the model are reliable as long as the pressure is smaller than a certain critical value for which recombination radiation to be fundamental level beings to be strongly absorbed by the plasma. For pressures higher than this critical value the results of the model are meaningless and a generalized treatment of the radiation (taking into account radiative transfer equations) should be required.

日本語訳

5流体MHDモデルが、プラズマフォーカス装置において生成される電流シースの構造を記述するために提示される。電子衝突励起および電離(それぞれの逆過程を含む)が取り扱いに含まれ、また放射過程も含まれるが、電流シースが線放射に対して不透明であり、連続放射(自由-自由および自由-束縛放射)に対して透明であるという仮定の下でのみである。方程式の数値解は、中性ガスの圧力と駆動磁場の大きさという2つのパラメータに関して提示される。磁場の値が与えられたとき、モデルの結果は、圧力がある臨界値よりも小さい限り信頼できる。その臨界値では、再結合放射がプラズマによって強く吸収され始める。この臨界値よりも高い圧力では、モデルの結果は無意味となり、放射輸送方程式を考慮した一般化された放射の取り扱いが必要となる。

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Plasma sheathPlasma focus
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