Particle Simulation Study of Dust Particle Dynamics in Sheaths
Particle Simulation Study of Dust Particle Dynamics in Sheaths
复制标题
鞘内粉尘粒子动力学的粒子模拟研究
DOI：
10.1002/ctpp.200410020
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发表时间：
2003
影响因子：
1.6
通讯作者：
Y. Chutov
中科院分区：
文献类型：
--
作者：
R. Smirnov;Y. Tomita;T. Takizuka;A. Takayama;Y. Chutov
利用静电护套和电离预护套中尘埃动量和电荷方程的数值解，模拟了导流等离子体中尘埃粒子的动力学，其中考虑了静电力和等离子体离子吸收的阻力。通过粒子模拟，包括电子冲击电离，得到了转向器中等离子体参数的空间分布。我们发现临界尘埃半径是存在的。半径大于临界半径的灰尘颗粒无法脱离导流板，因为离子阻力比静电力更强。控制板面电位可以抑制板面上的粉尘运动。重尘粒子的半径根据平衡位置进行分类。考虑尘埃颗粒在小于临界半径的板上开始，发现了两种类型的尘埃运动。具有第一种运动的尘埃粒子在接近其平衡位置之前回到板上。第二种运动是由较小的尘埃粒子围绕它们的平衡位置振荡而呈现的。（©2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim）
Dynamics of dust particles in a divertor plasma is simulated using numerical solutions of dust momentum and charging equations in an electrostatic sheath and an ionizing presheath, where an electrostatic force and a drag force due to absorption of plasma ions are taken into account. Spatial distributions of plasma parameters in a divertor are obtained with particle simulations including ionization by electron‐impact. We found that the critical dust radius exists. Dust particles with a larger radius than this critical one are incapable to come off a divertor plate because the ion drag force is stronger compared to the electrostatic force. Control of the plate potential can suppress the dust motion from the plate. The radii of heavy dust particles are classified with respect to equilibrium positions. Considering dust particles started at the plate with radii smaller than the critical one, two types of dust motion were found. Dust particles with the first type of motion come back to the plate before approaching their equilibrium positions. The second type of motion is presented by smaller dust particles which oscillate around their equilibrium positions. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)