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Non-linear theory of collisional drift modes, anomalous skin effect and enhanced penetration of particles during fuelling

A. Rogister1980年被引用 1Nuclear FusionIF 3出版社

The non-linear evolution of drift waves is described in the framework of weak-turbulence theory and of Taylor's strong-toroidal-coupling approximation. It is found that when the stabilizing effect of shear is annihilated by the toroidal coupling due to magnetic curvature, the radial wavelength of the modes increases with increasing amplitude until ion Landau damping balances the de-stabilizing effect of the electrons, which, in its turn, decreases with increasing turbulence level. The anomalous particles and electron thermal transports are estimated for the collisional drift instability driven by inverse electron temperature gradients. It is shown that the corresponding fluxes are towards the regions of lower density and electron temperature, respectively. Furthermore, they may exceed the neoclassical fluxes by three orders of magnitude (or even more) as required to explain the anomalous skin effect observed in tokamaks and the rapid penetration of cold particles to the plasma core during fuelling by injection of cold neutrals.

日本語訳

ドリフト波の非線形発展は、弱乱流理論およびテイラーの強トロイダル結合近似の枠組みの中で記述される。磁気曲率によるトロイダル結合によってシアの安定化効果が消滅するとき、モードの動径波長は振幅の増加とともに増大し、イオンランダウ減衰が電子の不安定化効果と釣り合うまで続くことが見出される。この電子の不安定化効果は、その側では乱流レベルの増加とともに減少する。逆電子温度勾配によって駆動される衝突性ドリフト不安定性に対する異常粒子輸送および電子熱輸送が評価される。対応するフラックスは、それぞれ低密度領域および低電子温度領域に向かうことが示される。さらに、それらは新古典論的フラックスを3桁(あるいはそれ以上)超える可能性があり、トカマクで観測される異常表皮効果および冷たい中性粒子の注入による燃料供給中のプラズマコアへの冷粒子の急速な浸透を説明するために必要とされる。

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