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Numerical characterization of plasma breakdown in reversed field pinches

Yanli Peng, Ya Zhang, Wenzhe Mao, Zhoujun Yang, Xiwei Hu, Wei Jiang2018年被引用 7Nuclear FusionIF 3出版社

In the reversed field pinch, there is considerable interest in investigating the plasma breakdown. Indeed, the plasma formed during the breakdown may have an influence on the confinement and maintenance in the latter process. However, up to now there has been no related work, experimentally or in simulation, regarding plasma breakdown in reversed field pinch (RFP). In order to figure out the physical mechanism behind plasma breakdown, the effects of the toroidal and error magnetic field, as well as the loop voltage have been studied. We find that the error magnetic field cannot be neglected even though it is quite small in the short plasma breakdown phase. As the toroidal magnetic field increases, the averaged electron energy is reduced after plasma breakdown is complete, which is disadvantageous for the latter process. In addition, unlike the voltage limits in the tokamak, loop voltages can be quite high because there are no requirements for superconductivity. Volt-second consumption has a small difference under different loop voltages. The breakdown delay still exists in various loop voltage cases, but it is much shorter compared to that in the tokamak case. In all, successful breakdowns are possible in the RFP under a fairly broad range of parameters.

日本語訳

反転磁場ピンチ(RFP)におけるプラズマの破壊(ブレークダウン)の調査には大きな関心が寄せられている。実際、破壊中に形成されるプラズマは、その後の閉じ込めと維持に影響を及ぼす可能性がある。しかしながら、これまでRFPにおけるプラズマ破壊に関する研究は、実験的にもシミュレーション的にも行われていない。プラズマ破壊の背後にある物理的メカニズムを解明するため、トロイダル磁場と誤差磁場の影響、ならびにループ電圧について研究を行った。その結果、誤差磁場は短い破壊段階において非常に小さいにもかかわらず無視できないことが分かった。トロイダル磁場が増加すると、破壊完了後の平均電子エネルギーは低下し、これはその後の過程にとって不利である。さらに、トカマクにおける電圧限界とは異なり、超伝導の要件がないため、ループ電圧はかなり高く設定できる。異なるループ電圧下では、ボルト秒消費量にわずかな差が見られた。様々なループ電圧の場合においても破壊遅延は依然として存在するが、トカマクの場合と比較してはるかに短い。全体として、RFPではかなり広いパラメータ範囲で破壊の成功が可能である。

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Reversed field pinch
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