The property of scrape-off layer (SOL) currents induced by a biased electrode is investigated by fully kinetic collisionless two-dimensional particle-in-cell (PIC) simulations. A reduced Vlasov–Darwin model is employed, which is capable of describing the low-frequency kinetic behavior without electromagnetic vacuum modes ( ##IMG## [http://ej.iop.org/images/1009-0630/22/10/105102/pstaba23bieqn1.gif] {${\omega }^{2}={\omega }_{\mathrm{pe}}^{2}+{c}^{2}{k}^{2}$} ). A linear decay distribution of electron currents parallel to the background magnetic field is exhibited. Simulation analyses indicate that the cross field ion current is a key factor in sheath formation and global current balance. The influences of electrode area, biasing voltage and plasma source on the SOL current profile are studied, respectively. Characteristic plasma parameters in the far SOL region of the EAST tokamak are used in simulations to assess the current driving ability of the electrode ...

中文翻译：

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使用2D单元格内粒子模拟对电极偏置引起的刮除层电流进行建模

通过完全动态无碰撞二维单元格内粒子（PIC）仿真研究了由偏置电极感应的刮除层（SOL）电流的特性。使用简化的Vlasov-Darwin模型，该模型能够描述没有电磁真空模式的低频动力学行为（## IMG ## [http://ej.iop.org/images/1009-0630/22/10 /105102/pstaba23bieqn1.gif] {$ {\ omega} ^ {2} = {\ omega} _ {\ mathrm {pe}} ^ {2} + {c} ^ {2} {k} ^ {2} $ }）。显示了平行于背景磁场的电子电流的线性衰减分布。仿真分析表明，交叉场离子电流是鞘层形成和整体电流平衡的关键因素。分别研究了电极面积，偏置电压和等离子体源对SOL电流分布的影响。