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First direct experimental evidence of the merging of two colliding field reversed configurations

Hui Liao, Chaoqi Hu, Yilin Li, Xuan Sun2022年Plasma Physics and Controlled FusionIF 2.2出版社

The collisional merging of two Alfvénic-speed translated field reversed configurations (FRCs) via magnetic reconnection is presented with a two-dimensional magnetic probe array in the Keda Mirror with AXisymmetricity-FRC experiment. The collision is accompanied by axial compression and radial expansion, resulting in the increase in the FRC's current density and poloidal flux. A reversed-current sheet is found to form during collision, indicating the occurrence of magnetic reconnection. After merging, the ion and electron temperature are increased. By comparing three different scenarios, i.e. the single-translated FRC, the FRC colliding solely with a stream plasma, and the collisional-merging FRC, we identify that axial compression and magnetic reconnection both contribute the electron heating.

日本語訳

2次元磁気プローブアレイを用いたKeda Mirror with AXisymmetricity実験における、2つのアルフヴェン速度で並進する反転磁場配位(FRC)の磁気リコネクションを介した衝突合体について発表する。この衝突には軸方向圧縮と径方向膨張が伴い、FRCの電流密度とポロイダル磁束が増加する。衝突中に反転電流シートが形成されることが観測され、磁気リコネクションの発生を示している。合体後、イオン温度と電子温度が上昇する。3つのシナリオ、すなわち単独で並進するFRC、ストリームプラズマとのみ衝突するFRC、および衝突合体するFRCを比較することにより、軸方向圧縮と磁気リコネクションの両方が電子加熱に寄与することを特定した。

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Field-Reversed Configuration
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