On the mechanism of electric breakdown under low-pressure discharge in helium

Sonin, A. Yu.

doi:10.1134/s1063785006030096

Cited by 1 publication

(2 citation statements)

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“…Investigation of the conditions of electric breakdown in gaseous media is an important tool for the characterization of elementary processes in electric field in plasma volume and on the cathode surface. For helium, a relationship between the breakdown voltage and product Pd of the gas pressure and interelectrode distance (Paschen's curve) in the region of minimum voltage (Paschen's miniauthor's e-mail: glizyakin@gmail.com mum at Pd ∼ 4 Torr·cm) represents a double-valued zigzag function [7,8]. A competition between electrons and fast ions with energies ∼1 keV for ionization events accounts for a complicated shape of the Paschen curve [8].…”

Section: Introductionmentioning

confidence: 99%

“…For helium, a relationship between the breakdown voltage and product Pd of the gas pressure and interelectrode distance (Paschen's curve) in the region of minimum voltage (Paschen's miniauthor's e-mail: glizyakin@gmail.com mum at Pd ∼ 4 Torr·cm) represents a double-valued zigzag function [7,8]. A competition between electrons and fast ions with energies ∼1 keV for ionization events accounts for a complicated shape of the Paschen curve [8]. At small interelectrode distances comparable with the ionization length, an important issue is establishing the equilibrium value of the Townsend ionization coefficient for the primary avalanche of electrons emitted from the cathode surface [7,9].…”

Section: Introductionmentioning

confidence: 99%

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Experiment and Numerical Simulation of Peculiarities in the Development of Helium DC Discharge in Reflex Geometry

Samokhin

Gavrikov

Liziakin

et al. 2016

Plasma and Fusion Research

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Reflex discharge has a large number of applications. However, there is no analytical formula allowing for the specified geometry to calculate the current or spatial characteristics of the discharge a priori. To do this, we create two-component model of the discharge in a diffusion-drift approximation in a magnetic field. The conditions of breakdown have been investigated in the framework of the Townsend mechanism. Current-voltage (I-V) characteristics, temporal variation of the discharge current and average ion density, and spatial distributions of ions and electrons have been calculated. I-V discharge characteristics in the absence of magnetic field have been measured. Experiments have been carried out in the discharge with a cylindrical anode with a length of 180 cm, diameter of 90 cm and a flat circular cathode with a diameter of 4 cm. The dependence of discharge current on the applied magnetic field has been determined. The dependence of steady-state discharge current on the order of electric and magnetic field switching has been studied. Comparison of theory with experiment provides qualitative agreement and it confirms the adequacy of the created model.

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Section: Introductionmentioning

confidence: 99%