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首页> 外文期刊>Contributions to Plasma Physics >Monte Carlo Simulations of the Influence of Ion-Neutral Collisions on the Ion Currents Collected by Electrostatic Probes
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Monte Carlo Simulations of the Influence of Ion-Neutral Collisions on the Ion Currents Collected by Electrostatic Probes

机译：离子中性碰撞对静电探针收集的离子电流影响的蒙特卡罗模拟

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摘要

We have carried out Monte Carlo simulation of the motion of Ar~+ ions in the space charge sheath surrounding a cylindrical Langmuir probe. The ion currents to the probe have been calculated from these simulations and the percentages of ions crossing the sheath boundary that are collected by the probe have been determined. It has been shown that the collisions of ions with neutral helium gas atoms in the sheath increase the percentage of ions collected by the probe above that predicted by collisionless orbital motion limited current (OMLC) theory at lower helium pressure and decrease this percentage below the OMLC theory prediction at higher helium pressure. It has been shown also that the ion current almost does not depend on probe radius at higher helium pressures. The results of the simulations have been compared with recent Langmuir probe measurements made in flowing afterglow plasmas and with other probe theories.
机译：我们对围绕圆柱形朗缪尔探针的空间电荷鞘层中Ar〜+离子的运动进行了蒙特卡洛模拟。通过这些模拟已经计算出到达探针的离子电流，并且已经确定了探针收集的越过鞘边界的离子的百分比。结果表明，离子与鞘中的中性氦气原子的碰撞使探针收集的离子百分率高于氦气在较低氦压下的无碰撞轨道运动极限电流（OMLC）理论所预测的百分比，而使该百分比降低至低于OMLC氦压力下的理论预测。还显示出，在较高氦气压力下，离子电流几乎不取决于探针半径。仿真结果已与最近在流动余辉等离子体中进行的Langmuir探针测量以及其他探针理论进行了比较。

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