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Neoclassical plateau regime transport in a tokamak pedestal

机译:托卡马克基座上的新古典高原政权运输

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In tokamak pedestals with subsonic flows the radial scale of plasma profiles can be comparable to the ion poloidal Larmor radius, thereby making the radial electrostatic field so strong that the E × B drift has to be retained in the ion kinetic equation in the same order as the parallel streaming. The modifications of neoclassical plateau regime transport - such as the ion heat flux and the poloidal ion and impurity flows - are evaluated in the presence of a strong radial electric field. The altered poloidal ion flow can lead to a significant increase in the bootstrap current in the pedestal where the spatial profile variation is strong because of the enhanced coefficient of the ion temperature gradient term near the electric field minimum. Unlike the banana regime, orbit squeezing does not affect the plateau regime results.
机译:在具有亚音速流的托卡马克基座中,等离子体轮廓的径向尺度可以与离子倍体拉莫尔半径相媲美,从而使径向静电场如此强大,以至于E×B漂移必须按与离子动力学方程相同的顺序保留并行流。在存在强径向电场的情况下,评估了新古典平稳状态输运的变化,例如离子热通量,多倍性离子流和杂质流。由于离子温度梯度项在电场最小值附近的系数增加,空间离子剖面的变化很强,改变了的离子离子流会导致基座中的自举电流显着增加。与香蕉体制不同,轨道挤压不会影响高原体制的结果。

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