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Kinetic microtearing modes and reconnecting modes in strongly magnetised slab plasmas

A Zocco, N F Loureiro, D Dickinson, R Numata, C M Roach2015年Plasma Physics and Controlled FusionIF 2.2出版社

The problem of the linear microtearing mode in a slab magnetised plasma, and its connection to kinetic reconnecting modes, is addressed. Electrons are described using a novel hybrid fluid-kinetic model that captures electron heating, ions are gyrokinetic. Magnetic reconnection can occur as a result of either electron conductivity and inertia, depending on which one predominates. We eschew the use of an energy dependent collision frequency in the collisional operator model, unlike previous works. A model of the electron conductivity that matches the weakly collisional regime to the exact Landau result at zero collisionality and gives the correct electron isothermal response far from the reconnection region is presented. We identify in the breaking of the constant-A|| approximation the necessary condition for microtearing instability in the collisional regime. Connections with the theory of collisional non-isothermal (or semicollisional) and collisionless tearing-parity electron temperature gradient driven (ETG) modes are elucidated.

日本語訳

スラブ状磁化プラズマにおける線形マイクロティアリングモードの問題と、運動論的再結合モードとの関連について考察する。電子は、電子加熱を捉える新規の流体・運動論ハイブリッドモデルを用いて記述され、イオンはジャイロ運動論的に記述される。磁気再結合は、電子の電気伝導度と慣性のいずれか支配的な方に起因して発生し得る。我々は、先行研究とは異なり、衝突演算子モデルにおいてエネルギー依存の衝突周波数を用いることを避ける。弱衝突領域を正確な無衝突ランダウ減衰結果に一致させ、再結合領域から遠方では正確な電子等温応答を与える電子電気伝導度のモデルを提示する。我々は、衝突領域におけるマイクロティアリング不安定性の必要条件を、定数A∥近似の破れの中に同定する。衝突性非等温(または半衝突性)および無衝突ティアリングパリティ電子温度勾配駆動(ETG)モードの理論との関連を明らかにする。

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