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3D particle-in-cell modeling of Langmuir probe effective collecting area in magnetized plasma

机译：磁化等离子体中Langmuir探头有效收集区域的3D粒子细胞建模

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摘要

Langmuir probes are a widespread tool for measurement of important plasma parameters such as electron temperature T-e, plasma electron density n(e), ion saturation current I-sat and the floating potential V-fl, which are obtained from a fit to the current-voltage (I-V) characteristic of the probe. In magnetized plasmas, the measurements can be affected by sheath expansion due to large negative bias voltages, which is addressed by the introduction of a fourth parameter to the fitting function correcting the values of all measured quantities. In order to derive the plasma density from I-sat, the understanding of probe ion collection is needed. In magnetized plasmas, the collecting area may not correspond to the real geometrical probe surface due to ion finite Larmor effects and so the derivation of I-sat (and hence n) can be rather complicated. In this work, the influence of magnetic fields on the probe effective collecting area is studied by the means of fully 3D3V particle-in-cell model SPICE3. A parameter scan based on properties of scrape-off layer plasmas at COMPASS tokamak as well as a. particular probe pin used on a horizontal reciprocating manipulator is performed. The results reveal that the presence of the probe head has a substantial effect on the outcome of the measurement as it forms a magnetic presheath at the probe location. An approximate formula for addressing the change of effective collecting area is presented and the data from the simulations are compared to measurements of COMPASS reciprocating probes and lithium beam emission spectroscopy.
机译：Langmuir探头是用于测量重要等离子体参数的广泛工具，例如电子温度TE，等离子体电子密度N（e），离子饱和电流I-SAT和浮动电位V-FL，其从拟合到电流 - 探头的电压（iv）特性。在磁化等离子体中，由于大的负偏置电压，测量可以受到护套膨胀的影响，这是通过引入拟合功能来解决所有测量量的值的第四参数来解决。为了从I-SAT获得等离子体密度，需要了解探针离子收集。在磁化等离子体中，收集区域可能与离子有限大学效应导致的真实几何探针表面相对应，因此I-SAT（并且因此N）的推导也可以是相当复杂的。在这项工作中，通过完全3D3V粒子内模型Spice3研究了磁场对探针有效收集区域的影响。基于Compass Tokamak刮削层等离子体的属性的参数扫描以及A.执行在水平往复式操纵器上使用的特定探针。结果表明，探针头的存在对测量结果具有显着影响，因为它在探针位置形成磁预级。提出了用于解决有效收集区域变化的近似公式，并将来自模拟的数据与罗盘往复探针和锂束发射光谱的测量进行比较。

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