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Study of fast-ion transport induced by fishbones on JET

C. Perez von Thun, A. Salmi, A. Perona, S.E. Sharapov, S.D. Pinches, S. Popovichev, S. Conroy, V.G. Kiptily, M. Brix, M. Cecconello2012年被引用 10Nuclear FusionIF 3出版社

The impact of fishbone oscillations onto a confined fast-ion population is simulated for a JET plasma and benchmarked against experiment quantitatively with the help of neutron rate measurements. The transient drops in volume integrated neutron emission are found to be mainly caused by the spatial redistribution of the (neutral beam injected) fast-ion population confined in the plasma rather than by fast-ion loss. The simulations yield a quadratic dependence of the neutron drop on the fishbone amplitude. It is found that the simulations are able to correctly reproduce the magnitude of the experimentally observed drop in volume integrated neutron emission to within a factor 2. Furthermore, frequency chirping is found to be important. Omitting the fishbone frequency chirp in the simulations reduces the magnitude of the neutron rate drop (and hence fast-ion redistribution) to about half its original value.

日本語訳

魚骨振動が閉じ込められた高速イオン集団に及ぼす影響を、JETプラズマに対してシミュレーションし、中性子率測定を用いて定量的に実験と比較検証した。体積積分された中性子放出の過渡的な低下は、主にプラズマ内に閉じ込められた(中性粒子ビーム入射による)高速イオン集団の空間的再分布によって引き起こされることが明らかになった。シミュレーションにより、中性子低下は魚骨振動の振幅に対して二次関数的に依存することが示された。また、シミュレーションは実験で観測された体積積分中性子放出の低下の大きさを、2倍以内の精度で正しく再現できることが見出された。さらに、周波数チャープが重要であることが判明した。シミュレーションにおいて魚骨振動の周波数チャープを省略すると、中性子率低下の大きさ(ひいては高速イオン再分布)は元の値の約半分に減少した。

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JETFusion Advanced Studies TorusEnergetic ionIon transport
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