Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 53, Issue 8, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6463/ab58b4
Keywords
steamer discharge in atmospheric-pressure air; electron velocity distribution function; laser Thomson scattering
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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 N-2 and O-2, 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 x 10(14) cm(-3).
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