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Staged cooling of a fusion-grade plasma in a tokamak thermal quench

Jun Li, Yanzeng Zhang, Xian-Zhu Tang2023年被引用 2Nuclear FusionIF 3出版社

In tokamak disruptions where the magnetic connection length becomes comparable to or even shorter than the plasma mean-free-path, parallel transport can dominate the energy loss and the thermal quench of the core plasma goes through four phases (stages) that have distinct temperature ranges and durations. The main temperature drop occurs while the core plasma remains nearly collisionless, with the parallel electron temperature dropping in time t as and a cooling time that scales with the ion sound wave transit time over the length of the open magnetic field line. These surprising physics scalings are the result of effective suppression of parallel electron thermal conduction in an otherwise bounded, quasineutral, and collisionless plasma, which is different from what are known to date on electron thermal conduction along the magnetic field in a nearly collisionless and quasineural plasma.

日本語訳

磁気接続長がプラズマの平均自由行程と同等かそれよりも短くなるトカマク・ディスラプションでは、平行輸送がエネルギー損失を支配し得、コアプラズマの熱クエンチは、異なる温度範囲と継続時間を持つ4つのフェーズ(段階)を経る。主な温度降下は、コアプラズマがほぼ無衝突のままである間に起こり、平行電子温度は時間 t とともに として低下し、冷却時間は開放磁力線の長さにわたるイオン音波の通過時間でスケールする。これらの驚くべき物理的スケーリングは、それ以外の点では有界で準中性かつ無衝突のプラズマにおける平行電子熱伝導の効果的な抑制の結果であり、これは、ほぼ無衝突かつ準中性のプラズマにおける磁場に沿った電子熱伝導についてこれまでに知られていることとは異なる。

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