The ion accumulation within the negatively charged dust cloud embedded in a plasma of dc glow discharge has been studied numerically under the conditions corresponding to recent experiments. The characteristics of neon plasma in a positive column of dc discharge with various densities of micron-sized particles have been simulated by a diffusion-drift model with the use of experimental values of parameters of dust clouds. The model considers an additional gas heating associated with the presence of a dust component. It has been shown that the injection of dust particles into a plasma can either reduce the density of ions due to their recombination on dust particles or increase it due to the formation of an ion concentrator. Conditions under which the plasma-dust cloud represents an ion concentrator have been found; the density of ions in this trap can be several times higher than that in a discharge without dust particles. The method of elevating the ion density with dust particles has been shown to be more efficient than increasing the discharge current without dust particles and the value of relative overheating of the discharge with dust particles is many times less. The possibility of obtaining the desired ion density in a dust cloud at different neon pressures and the same discharge current has been demonstrated; it should be emphasized that this is impossible in a discharge without dust particles.

中文翻译：

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直流放电中灰尘云的离子积累

在与最近的实验相对应的条件下，已经对嵌入在直流辉光放电等离子体中的带负电尘埃云中的离子积累进行了数值研究。利用尘埃云参数的实验值，通过扩散漂移模型模拟了具有各种微米级颗粒密度的直流放电正极柱中氖等离子体的特性。该模型考虑了与灰尘成分存在相关的额外气体加热。已经表明，将尘埃粒子注入等离子体可以由于它们在尘埃粒子上的复合而降低离子密度，或者由于离子集中器的形成而增加离子密度。已发现等离子体尘埃云代表离子浓缩器的条件；该陷阱中的离子密度可能比没有灰尘颗粒的放电中的离子密度高几倍。已经证明，使用灰尘颗粒提高离子密度的方法比没有灰尘颗粒的情况下增加放电电流更有效，并且带有灰尘颗粒的放电的相对过热值要小很多倍。已经证明了在不同氖压力和相同放电电流下在尘埃云中获得所需离子密度的可能性；应该强调的是，这在没有粉尘颗粒的排放中是不可能的。已证明使用粉尘颗粒提高离子密度的方法比增加不含粉尘颗粒的放电电流更有效，并且使用粉尘颗粒放电的相对过热值要小很多倍。已经证明了在不同氖压力和相同放电电流下在尘埃云中获得所需离子密度的可能性；应该强调的是，这在没有粉尘颗粒的排放中是不可能的。已证明使用粉尘颗粒提高离子密度的方法比增加不含粉尘颗粒的放电电流更有效，并且使用粉尘颗粒放电的相对过热值要小很多倍。已经证明了在不同氖压力和相同放电电流下在尘埃云中获得所需离子密度的可能性；应该强调的是，这在没有粉尘颗粒的排放中是不可能的。