20.500.12556/RUL-156326 One-dimensional, multi-fluid model of the plasma-wall transition Negative ions The plasma-wall transition is investigated by a one-dimensional steady-state multifluid model, which was presented in detail in Part I [T. Gyergyek et al., AIP Adv. 14, 045201 (2024)]. In this work, the plasma-wall transition is analyzed for the case where the plasma consists of singly charged positive ions, electrons, and singly charged negative ions. When the temperature and initial density of the negative ions are varied, a transition between two types of solutions of the model is observed. We call them the low and high solution, with respect to the absolute value of the potential drop. When the density and temperature of the negative ions are above a critical value, the low solution is observed. As the mass of the positive ions increases, these critical values also increase, but only until the ion mass is below about 1000 electron masses. With larger ion masses, the critical density of the negative ions and the temperature no longer change. In the low solution, the potential drop in front of the sheath is determined by the negative ions and is smaller in absolute terms than in the case of the high solution, where the potential drop in front of the sheath is determined by the electrons. If the problem is analyzed on the pre-sheath scale, the transition between the low and high solution is very sharp. However, when the neutrality condition is replaced by the Poisson equation, this transition becomes blurred and the solutions of the model equations exhibit oscillations. The role of the smallness parameter is highlighted. It is shown how the initial electric field is determined. Deviation of the negative ion density profile from the Boltzmann relation is discussed. plasma sheath Bohm criterion negative ions plazma plašč Bohmov kriterij negativni ioni true false true Angleški jezik Slovenski jezik Članek v reviji 2024-05-20 12:34:44 2024-05-20 12:34:50 2025-11-11 08:59:12 0000-00-00 00:00:00 2024 0 0 20 str. iss. 19, art. 193301 Vol. 135 21. May 2024 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 533 1089-7550 10.1063/5.0200381 195956483 193301_1_5.0200381.pdf 193301_1_5.0200381.pdf 1 1A428904A5215118A5E6E545AB122371 b3f088ad6e911a4ba0fbc24cb00b948bc484d42bf8fd6e6cc17b1dad95888c71 de632c02-1694-11ef-b600-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=183727 https://pubs.aip.org/aip/jap/article/135/19/193301/3293833/One-dimensional-multi-fluid-model-of-the-plasma 1 9757e998-1694-11ef-b600-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=183726 Fakulteta za elektrotehniko Fakulteta za strojništvo 0 0 0