Open AccessВлияние предыонизации на микроканальную структуру искрового разряда в воздухе в промежутке острие-плоскость
Author(s) -
А.А. Тренькин,
К.И. Алмазова,
А.Н. Белоногов,
В.В. Боровков,
Е.В. Горелов,
И.В. Морозов,
С.Ю. Харитонов
Publication year - 2022
Publication title -
žurnal tehničeskoj fiziki
Language(s) - English
Resource type - Journals
eISSN - 1726-748X
pISSN - 0044-4642
DOI - 10.21883/jtf.2022.01.51851.237-21
Subject(s) - cathode , ionization , materials science , anode , nanosecond , photoionization , electron , instability , atomic physics , atmospheric pressure , optics , mechanics , chemistry , laser , physics , ion , electrode , meteorology , organic chemistry , quantum mechanics
The initial phase of a spark discharge in the gap between the pin (cathode) and a plane 1.5 mm long in atmospheric pressure air under conditions of preliminary photoionization by an auxiliary discharge was investigated by the method of shadow photography. In the absence of preionization, the discharge from the first nanoseconds after breakdown is an aggregate of a large number of micron-diameter channels. It was found that the electron concentration resulting from preionization, estimated at 108 109 cm-3, increases the degree of uniformity of the discharge channel in the near-cathode region; however, in the near-anode region, the channel remains microstructured. Within the framework of the mechanism of microstructure formation due to the instability of the ionization wave front, a criterion for the formation of a uniform discharge is obtained and an explanation of the results obtained is presented.