The Effect of the Mode of Gas Preionization on the Parameters of Runaway Electrons in High-Pressure Discharges


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Resumo

The results of theoretical modeling of the process of formation of a nanosecond discharge in a coaxial discharge gap filled with a high-pressure gas are presented. Two cardinally different evolution scenarios of the nanosecond discharge are addressed: A) in a uniformly volume pre-ionized gas medium and B) in a strongly spatially-nonuniform initially-ionized region near the cathode with a small curvature radius. Relying on the minimal mathematical model of a high-voltage discharge and the description of the physical kinetics of runaway electrons, it is shown using the Boltzmann kinetic equation that the amplitude and duration of a current pulse of runaway electrons and their energy spectrum strongly depend on the mode of gas preionization in the gap. In particular, the other conditions being equal, near-cathode initiation gives rise to the generation of a large group of low-energy runaway electrons within the late current-switching stage. The volume-homogeneous gas preionization can reduce the number of fast electrons by nearly two orders of magnitude compared to the regime without preionization.

Sobre autores

V. Kozhevnikov

National Research Tomsk State University; Institute of High Current Electronics of the Siberian Branch of the Russian Academy of Sciences

Autor responsável pela correspondência
Email: vasily.y.kozhevnikov@ieee.org
Rússia, Tomsk; Tomsk

A. Kozyrev

National Research Tomsk State University; Institute of High Current Electronics of the Siberian Branch of the Russian Academy of Sciences

Email: vasily.y.kozhevnikov@ieee.org
Rússia, Tomsk; Tomsk

N. Semeniuk

National Research Tomsk State University; Institute of High Current Electronics of the Siberian Branch of the Russian Academy of Sciences

Email: vasily.y.kozhevnikov@ieee.org
Rússia, Tomsk; Tomsk

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