Measurement of electron velocity distribution function in a pulsed positive streamer discharge in atmospheric-pressure air

Laser Thomson scattering (LTS) was used for the first time to measure the non-Maxwellian electron velocity distribution function (EVDF) in an atmospheric-pressure-air pulsed positive streamer discharge. The air streamer was generated with specially designed electrode configuration which provided goo...

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Bibliographic Details
Published in:Journal of physics. D, Applied physics Applied physics, 2020-02, Vol.53 (8), p.8
Main Authors: Tomita, Kentaro, Inada, Yuki, Komuro, Atsushi, Zhang, Xiang, Uchino, Kiichiro, Ono, Ryo
Format: Article
Language:English
Subjects:
electron velocity distribution function
laser Thomson scattering
steamer discharge in atmospheric-pressure air
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Summary:Laser Thomson scattering (LTS) was used for the first time to measure the non-Maxwellian electron velocity distribution function (EVDF) in an atmospheric-pressure-air pulsed positive streamer discharge. The air streamer was generated with specially designed electrode configuration which provided good spatial reproducibility. The LTS was conducted at a secondary streamer phase with a repetition rate of 2 Hz. To reduce the measurement error caused by intense rotational Raman scattering from N2 and O2, 20 000 LTS signals were accumulated. The LTS spectrum, which was a 1D-projected EVDF in the streamer, has shown a non-Maxwellian EVDF predicted by solving the Boltzmann equation. The measured EVDF exhibited good agreement with an EVDF calculated with E/N  =  150 Td. Electron density at the initial phase of the secondary streamer was obtained from the LTS spectrum as 2.7  ×  1014 cm−3.
ISSN:0022-3727
1361-6463
DOI:10.1088/1361-6463/ab58b4