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Model of a giant ELM

Sanae-I Itoh, Kimitaka Itoh, Atsushi Fukuyama1996年Plasma Physics and Controlled FusionIF 2.2出版社

A model of the giant ELMs (type-I ELM) is developed. Theory of the self-sustained turbulence of the current-diffusive ballooning mode (CDBM) is developed, and multifold states for the L-mode, H-mode and the third state with magnetic braiding, M-mode, are obtained. The transition to M-mode occurs if the pressure gradient reaches a critical value. The nonlinear excitation of the magnetic perturbation takes place, the growth time of which is of the order of the poloidal-Alfvén transit time, followed by catastrophic enhancement of the transport coefficient. Avalanche of the transport catastrophe is also analysed, showing a very rapid radial propagation velocity. The M-state terminates if the pressure gradient becomes small, leading to the back-transition to the H-(L-)mode. Under the constant power supply, these processes can repeat themselves, causing periodic bursts. The period becomes shorter as the average power flux increases.

日本語訳

巨大ELM(type-I ELM)のモデルが開発される。電流拡散バルーニングモード(CDBM)の自己維持乱流理論が構築され、Lモード、Hモード、および磁気リコネクションを伴う第三の状態であるMモードに対する多重状態が得られる。圧力勾配が臨界値に達するとMモードへの遷移が生じる。磁気擾乱の非線形励起が発生し、その成長時間はポロイダル・アルフヴェン通過時間のオーダーであり、続いて輸送係数の壊滅的な増大が起こる。輸送の雪崩現象も解析され、非常に速い径方向伝播速度を示す。圧力勾配が小さくなるとM状態は終了し、Hモード(またはLモード)への逆遷移が起こる。一定のパワー供給下では、これらのプロセスは繰り返され、周期的なバーストを生じる。バースト周期は平均パワーフラックスが増加するにつれて短くなる。

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