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首页> 外文期刊>Nuclear fusion >Gyrokinetic study of collisional resonant magnetic perturbation (RMP)-driven plasma density and heat transport in tokamak edge plasma using a magnetohydrodynamic screened RMP field
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Gyrokinetic study of collisional resonant magnetic perturbation (RMP)-driven plasma density and heat transport in tokamak edge plasma using a magnetohydrodynamic screened RMP field

机译：利用磁流体动力学筛选的RMP场研究碰撞共振磁扰动（RMP）驱动的等离子体密度和托卡马克边缘等离子体中的热传输的动力学。

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The total-f gyrokinetic particle-in-cell code XGC is applied to study various aspects of collisional transport in the tokamak edge pedestal in the presence of resonant magnetic perturbations (RMPs) calculated with M3D-C1. Simulations including the separatrix and scrape-off layer are exercised for a model DIII-D H-mode plasma. Neutral particle recycling is modeled by means of ionization and charge exchange with the plasma. A fully nonlinear Fokker-Planck collision operator is utilized to account for non-Maxwellian edge plasma. The study yields kinetic evidence that (i) neglecting the non-axisymmetric component of the RMP-generated electrostatic potential perturbation could yield a fictitiously high particle pump-out rate in the edge pedestal; that (ii) the experimental level of particle pump-out from the pedestal cannot be provided by collisional transport across Kohnogorov-Amold-Moser surfaces except across the magnetic separatrix where stochastic magnetic field lines exist; that (iii) the H-mode type electron heat barrier is retained in the steep slope area under the M3D-C1 calculated RMPs; and that (iv) the stochastic electron heat-transport rate around the magnetic separatrix surface is much lower than the prediction by Rechester-Rosenbluth (1978 Phys. Rev. Lett. 40 38-41) and is qualitatively consistent with the experimentally observed rate. Detailed kinetic physics analysis on how the transport fluxes, electrostatic potential perturbation, and E-r-well structure respond to onset of RMPs is also reported.
机译：在研究使用M3D-C1计算出共振磁扰动（RMP）的情况下，将全功能陀螺动力学粒子代码XGC用于研究托卡马克边缘基座中碰撞传输的各个方面。对于模型DIII-D H模式等离子体进行了包括分离层和刮除层的仿真。中性粒子的回收利用电离和与等离子体的电荷交换来建模。利用完全非线性的Fokker-Planck碰撞算子来解释非Maxwellian边缘等离子体。这项研究得出的动力学证据是：（i）忽略RMP产生的静电势扰动的非轴对称分量可能会在边缘基座上产生假想的高颗粒抽出率； （ii）除了通过存在随机磁场线的磁分离线以外，在Kohnogorov-Amold-Moser表面之间的碰撞传输无法提供从基座抽出颗粒的实验水平； （iii）在M3D-C1计算得出的RMPs下的陡坡区域中保留了H型电子阻挡层； （iv）围绕磁性分离线表面的随机电子传热速率远低于Rechester-Rosenbluth（1978 Phys。Rev. Lett。40 38-41）的预测，并且在质量上与实验观察到的一致。还报道了有关传输通量，静电势扰动和E-r阱结构如何响应RMP发生的详细动力学物理分析。

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