Open AccessSubnanosecond breakdown of air-insulated coaxial line initiated by runaway electrons in the presence of a strong axial magnetic field
Author(s) -
G. Mesyats,
Elizaveta A. Osipenko,
K. A. Sharypov,
V. G. Shpak,
S. A. Shunaĭlov,
M. I. Yalandin,
Н. М. Зубарев
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2064/1/012003
Subject(s) - atomic physics , ionization , cathode , coaxial , plasma , anode , magnetic field , electron , materials science , breakdown voltage , pulse (music) , voltage , physics , chemistry , electrical engineering , ion , electrode , nuclear physics , quantum mechanics , engineering
Flow of runaway electrons (RAEs) propagating in a radial, air-filled gap of coaxial line (CL) changes the dynamics of breakdown in the field of traveling voltage pulse. However, despite the effect of RAEs, breakdown does not occur if subnanosecond pulse is less in duration and amplitude than some values. In this work, we study the influence of an external axial magnetic field ( B z ) on the breakdown development. We demonstrate the transformation of the voltage pulse reflection from the ionized (breakdown) zone with changing B z . Due to gyration of fast electrons in an applied magnetic field, the gas region ionized by RAEs does not reach the anode. The ionized bridge between the cathode and anode is gradually replaced by a near-cathode plasma layer representing a discrete, reflecting/absorbing inhomogeneity in the CL.