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Simulation studies of the radiation-driven tearing mode in tokamaks

Hai-Wen Xu, Hao-Wei Zhang, Yuan-Hong Song, Zhi-Wei Ma, You-Nian Wang2020年Plasma Physics and Controlled FusionIF 2.2出版社

The influence of bremsstrahlung and cyclotron radiation on the evolution and saturation of the resistive tearing mode is investigated by using a three-dimensional toroidal magnetohydrodynamic code. It is found that accumulation of impurities (such as tungsten) in magnetic islands has a destabilizing effect on the tearing mode due to an imbalance of local radiative cooling and Ohmic heating inside the island. The asymmetry current effect and the nonlinear mode coupling play an important role on evolution of the radiation-driven tearing mode instability. As a result, the magnetic island width could increase over 20% of the minor radius (disruption scale). Along with higher mode burst, multi-mode interaction makes magnetic field lines become stochastic. Moreover, the core pressure is reduced due to the radiation cooling inside the magnetic island. Consequently, the whole discharge area is shifted towards the high-field side, which leads to a strong intensification of the mode.

日本語訳

制動放射とサイクロトロン放射が抵抗性テアリングモードの進化と飽和に及ぼす影響を、三次元トロイダル磁気流体コードを用いて調べた。磁気島内への不純物(タングステンなど)の蓄積が、島内部の局所的な放射冷却とオーミック加熱の不均衡により、テアリングモードに対して不安定化効果を持つことが見出された。非対称電流効果と非線形モード結合は、放射駆動テアリングモード不安定性の進化において重要な役割を果たす。その結果、磁気島幅は小半径の20%以上にまで増大し得る(ディスラプション規模)。さらに、高次のモードバーストに伴い、多モード相互作用が磁力線を確率的にさせる。さらに、磁気島内部の放射冷却によりコア圧力が低下する。その結果、放電全体が高磁場側へシフトし、モードの強い増強が引き起こされる。

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Tearing mode
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