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arXiv 1508.04085physics.plasm-ph
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电阻率对刮除层纤维影响的三维模拟研究

Investigation of the Effect of Resistivity on Scrape Off Layer Filaments using Three Dimensional Simulations

Luke Easy, Fulvio Militello, John Omotani, Nick Walkden, Benjamin Dudson

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14 Pages, 15 Figures
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摘要：

托卡马克装置刮除层（SOL）中细丝的传播在很大程度上决定了该区域的等离子体分布。在传导受限的SOL中，预期平行的温度梯度，使得在靶处对平行电流的电阻大于在更上游处对平行电流的电阻。由于一个孤立的细丝的垂直运动在很大程度上取决于流经它的电流的平衡，这可能会影响细丝的运输。因此，3D模拟已被用于研究增强的平行电阻率对灯丝的动态的影响。具有最小垂直长度尺度的细丝在低电阻率下受到惯性限制（这意味着极化而不是平行电流决定其径向速度），不受电阻率的影响。对于较大的长丝，更快的速度产生在较高的折射率，由于两种机制。首先，平行电流减少，极化电流增强，这意味着惯性状态延伸到更大的细丝，其次，沿平行方向形成电势差，使得对于流入鞘层的相同量的电流，在细丝区域产生更高的电位。这些结果表明，更广泛的SOL配置文件可以在更高的结晶度。

英文摘要：

The propagation of filaments in the Scrape Off Layer (SOL) of tokamaks largely determine the plasma profiles in the region. In a conduction limited SOL, parallel temperature gradients are expected, such that the resistance to parallel currents is greater at the target than further upstream. Since the perpendicular motion of an isolated filament is largely determined by balance of currents that flow through it, this may be expected to affect filament transport. 3D simulations have thus been used to study the influence of enhanced parallel resistivity on the dynamics of filaments. Filaments with the smallest perpendicular length scales, which were inertially limited at low resistivity (meaning that polarization rather than parallel currents determine their radial velocities), were unaffected by resistivity. For larger filaments, faster velocities were produced at higher resistivities, due to two mechanisms. Firstly parallel currents were reduced and polarization currents were enhanced, meaning that the inertial regime extended to larger filaments, and secondly a potential difference formed along the parallel direction so that higher potentials were produced in the region of the filament for the same amount of current to flow into the sheath. These results indicate that broader SOL profiles could be produced at higher resistivities.

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