The study of lead vapor ionization in discharge with a hot cathode and efficiency of its deposition on the substrates applied for plasma separation method

31st International Conference on Equations of State for Matter

Antonov, N.N.^1 ; Samokhin, A.A.^1 ; Zhabin, S.N.^1 ; Gavrikov, A.V.^1 ; Smirnov, V.P.^1

Joint Institute for High Temperatures, Russian Academy of Sciences, Izhorskaya 13 Bldg 2, Moscow

125412, Russia^1

关键词: Condensation coefficients;    Density distributions;    Discharge current density;    Electrostatic potential distribution;    Experimental data analysis;    Experimental research;    Hydrodynamic simulation;    Ionization efficiency;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/774/1/012196/pdf
DOI  :  10.1088/1742-6596/774/1/012196

来源: IOP

【 摘 要 】

Spent nuclear fuel plasma separation method approbation implies the use of model substances. Thus it is necessary to solve the problem of material conversion into a cold plasma flow, as well as the problem of deposition on collectors. For this purpose, we carried out a kinetic and hydrodynamic simulation of the discharge with hot cathode in the lead vapor (lead vapor was injected into the interelectrode gap). Dependencies of the ionization efficiency, electrostatic potential distribution, density distribution of ions and electrons in the discharge gap on the discharge current density and the model substance vapor concentration were obtained. The simulation results show that at discharge current density of about 3.5 A/cm2and the lead vapor concentration of 2 × 1012cm-3, the ionization efficiency is close to 60%. Experimental research of the discharge with a hot cathode in the lead vapor was carried out. We also carried out the research of the Pb condensation coefficients on various substrates. For experimental data analysis the numerical model based on Monte Carlo method was used. The research results show that deposition coefficients at medium temperatures of substrates near 70 °C do not drop lower than 75%.