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Anomalous impurity transport in plasmas

A. Rogister, G. Hasselberg1983年被引用 6Nuclear FusionIF 3出版社

The transport of high-Z impurities resulting from Compton and induced scattering by drift waves is found to be comparable in magnitude with base ion and electron transport when the fluctuation spectrum is obtained from a recent theory of drift turbulence. The anomalous frictional flux is marginally subdominant whilst the diffusion flux is enhanced over the neoclassical value by a numerical factor which (i) agrees quantitatively with the results of impurity injection experiments, (ii) decreases with increasing base ion atomic mass, and (iii) is independent of the impurity-charge-to-mass ratio. The theory further predicts a dramatic increase in anomaly, also in agreement with experimental results, when the growth rate is enhanced during the heat pulse released by the sawtooth relaxations of the core.

日本語訳

高Z不純物の輸送は、ドリフト波によるコンプトン散乱および誘導散乱に起因するものであるが、その大きさは、ドリフト乱流の最近の理論から得られたゆらぎスペクトルを用いた場合、基底イオンおよび電子の輸送と同程度であることが見出された。異常フラックスはわずかに準拡散的(副支配的)である一方、拡散フラックスは新古典論的値に対して数値因子により増大しており、その数値因子は、(i) 不純物注入実験の結果と定量的に一致し、(ii) 基底イオンの原子番号の増加とともに減少し、(iii) 不純物の電荷対質量比に依存しない。さらにこの理論は、コアにおける鋸歯状緩和によって放出される熱パルスの間に成長率が増大すると、異常性が劇的に増大することを予測しており、これも実験結果と一致する。

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