论文标题
热离子转换器中氩等离子体衰减的模拟
Simulations of Argon Plasma Decay in a Thermionic Converter
论文作者
论文摘要
使用粒子中的模拟（PIC）模拟研究了热离子二极管间隙中氩等离子体的动力学。研究了时间平均的二极管电流作为电极之间相对电势的函数，而由于电极表面上的重组而引起的血浆密度耗竭。在1D和2D中进行了模拟，并且在两种情况之间的血浆衰减中观察到显着差异。具体而言，在2D中发现，静电电势随着血浆衰变的变化而逐渐变化，而血浆中的1D波动导致了巨大的潜在波动，这改变了与2D情况相对于2D情况的血浆衰减特性。这在时间平均二极管电流上产生了显着差异。此外，发现当二极管电压设置为平移条件时，收集了最大时间平均电流，在该条件下，阴极和阳极真空偏置相等。这表明了一种新的技术，可以测量热离子转换器中阴极和阳极之间工作功能的差异。
The dynamics of an argon plasma in the gap of a thermionic diode is investigated using particle-in-cell (PIC) simulations. The time-averaged diode current, as a function of the relative electrical potential between the electrodes, is studied while the plasma density depletes due to recombination on the electrode surfaces. Simulations were performed in both 1D and 2D and significant differences were observed in the plasma decay between the two cases. Specifically, in 2D it was found that the electrostatic potential gradually changes as the plasma decays, while in 1D fluctuations in the plasma led to large potential fluctuations which changed the plasma decay characteristics relative to the 2D case. This creates significant differences in the time-averaged diode current. Furthermore, it was found that the maximum time-averaged current is collected when the diode voltage is set to the flat-band condition, where the cathode and anode vacuum biases are equal. This suggests a novel technique of measuring the difference in work functions between the cathode and anode in a thermionic converter.
