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首页> 外文期刊>Nuclear fusion >Comparisons of density profiles in JT-60U tokamak and LHD helical plasmas with low collisionality
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Comparisons of density profiles in JT-60U tokamak and LHD helical plasmas with low collisionality

机译：低碰撞性的JT-60U托卡马克和LHD螺旋等离子体的密度分布比较

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摘要

In order to understand particle transport systematically in toroidal plasmas, electron density profiles were compared in JT-60U tokamak and LHD helical plasmas with low collisionality. The peakedness of density profiles increased with decreasing collisionality in ELMy H-mode plasmas of JT-60U when the collisionality at half the minor radius was in the collisionless regime. The collisionality dependence of density profiles in LHD plasmas was similar to that in JT-60U plasmas in the same collisionality regime when neoclassical transport was reduced by geometrical optimization. On the other hand, in LHD plasmas having relatively larger neoclassical transport than that in the above case, the peakedness of the density profiles decreased with decreasing collisionality. Density profiles in LHD plasmas tend to approach those in JT-60U, which are dominated by anomalous transport, as the contribution of neoclassical transport was reduced.
机译：为了系统地了解在环形等离子体中的粒子传输，在具有低碰撞性的JT-60U托卡马克和LHD螺旋等离子体中比较了电子密度分布。当小半径一半处的碰撞处于无碰撞状态时，JT-60U的ELMy H型等离子体中，随着碰撞的减小，密度分布图的峰度增加。当通过几何优化减少新古典运输时，LHD等离子体中密度分布的碰撞依赖性与JT-60U等离子体中的碰撞相似。另一方面，在具有比上述情况更大的新古典运动的LHD等离子体中，密度分布的峰度随着碰撞性的降低而降低。由于新古典运输的贡献减少，LHD血浆中的密度分布趋于接近JT-60U中的密度分布，其中JT-60U以异常运输为主导。

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