基于COMSOL辉光放电带电粒子特性模拟分析

Simulation and Analysis of the Characteristics of Charged Particles in Glow Discharge Based on COMSOL

摘要: 为了研究空芯光纤中氩气的放电特性，采用软件COMSOL的有限元方法计算相应的数学等式，基于等离子体放电理论，建立了圆柱型二维直流辉光放电流体模型。得到氩气放电在不同电压下反应腔内电子流密度、电子密度、激发态氩原子密度、电子温度等粒子密度的变化和在阴极区不同电压下粒子密度和电子温度的变化，最后对距离阴极区0.1 m的空间电荷密度做了分析。结果表明：随着电压的增大，阴极区粒子密度呈现出逐渐增加的趋势并且电子流密、电子密度和电子温度在100 V时变化明显。由于反应腔内的氩气量的影响，激发态氩原子密度和空间电荷密度随着电压的增大趋于稳定。

Abstract: In order to study the discharge characteristics of argon in hollow-core optical fiber, the finite ele-ment method of the software COMSOL was used to calculate the corresponding mathematical equa-tions. Based on the plasma discharge theory, a cylindrical two-dimensional DC glow discharge fluid model was established. The changes of particle density such as electron current density, electron density, excited state argon atom density, and electron temperature in the reaction chamber of ar-gon discharge under different voltages, and the changes of particle density and electron tempera-ture in the cathode area under different voltages were obtained. Finally, the space charge density at a distance of 0.1 m from the cathode area was analyzed. The results show that the particle density in the cathode region tends to increase gradually with the increase of the voltage, and the electron current density, electron density, and electron temperature change obviously at 100 V. Due to the influence of the amount of argon in the reaction chamber, the excited state argon atom density and space charge density tend to be stable with the increase of voltage.