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Spontaneous development of toroidal magnetic field during formation of field-reversed theta pinch

D.W. Hewett1984年被引用 25Nuclear FusionIF 3出版社

The formation of an FRC (Field-Reversed Configuration) is considered by using a hybrid simulation model that treats the electrons as a zero-inertia thermal fluid and the ions either kinetically or as a simple fluid. The unexpected spontaneous generation of a substantial toroidal magnetic field Bθ near magnetic reconnection points requires explanation. Although ion kinetic effects are responsible for some of the internal reconnection, simulations with a fluid ion representation also show similar self-generation of the toroidal field. Further investigation reveals that the origin of the toroidal field can be found in some of the terms that arise from retention of the Hall term – an automatic feature of the two-component model. Conceptually, the phenomena can be understood by noting that, if the magnetic field is 'frozen into the electron fluid', a sheared toroidal electron flow will stretch the poloidal field to make the toroidal field.

日本語訳

FRC(磁場反転配位)の形成を、電子を零慣性の熱流体として扱い、イオンを運動論的に、または単純な流体として扱うハイブリッドシミュレーションモデルを用いて考察する。磁気リコネクション点近傍での大きなトロイダル磁場Bθの予期しない自発的生成は、説明を要する。イオン運動論効果が内部リコネクションの一部に関与しているが、流体イオン表現を用いたシミュレーションでも、トロイダル磁場の同様の自発生成が見られる。さらなる調査により、トロイダル磁場の起源は、ホール項を保持することから生じるいくつかの項、すなわち二成分モデルの自動的な特徴の中に見いだせることが明らかになる。概念的には、磁場が「電子流体に凍結している」場合、シアを伴うトロイダル電子流がポロイダル磁場を引き伸ばしてトロイダル磁場を生成するという点に注意すれば、この現象は理解できる。

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Field-Reversed Configuration
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