Current evolution and plasma density space distribution in the reflex discharge with ring cathodes

31st International Conference on Equations of State for Matter

Samokhin, A.A.^1 ; Liziakin, G.D.^1 ; Gavrikov, A.V.^1 ; Usmanov, R.A.^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: Discharge mode;    Discharge voltages;    Drift-diffusion approximation;    Evolutionary process;    Helium pressure;    Reflex discharge;    Secondary ions;    Two-component plasma;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/774/1/012198/pdf
DOI  :  10.1088/1742-6596/774/1/012198

来源: IOP

【 摘 要 】

In this paper the numerical model of direct current gas discharge in drift-diffusion approximation is considered. For two-component plasma the processes of the gas discharge development in the reflex geometry with ring cathodes at a helium pressure of 35 mTorr are studied. We investigate the influence of: (a) the boundary conditions on the dielectric, (b) the electron temperature and (c) the coefficient of the secondary ion-electron emission on the I-U curve of the discharge. In a magnetic field of 50 Gauss the impact of the discharge voltage U = 300-700 V on the evolutionary process of the discharge is examined. The effect of diffusion on maintaining steady state discharge is researched. The parameters of the existence of a high-current (tens of μA) and low voltage (tens of mA) discharge modes are defined.