Emerging and expanding streamer head in low-pressure air

0524552 - ÚFP 2021 RIV GB eng J - Článek v odborném periodiku
Hoder, T. - Bonaventura, Z. - Prukner, Václav - Gordillo-Vázquez, F.J. - Šimek, Milan
Emerging and expanding streamer head in low-pressure air.
Plasma Sources Science & Technology. Roč. 29, č. 3 (2020), č. článku 03LT01. ISSN 0963-0252. E-ISSN 1361-6595
Grant CEP: GA ČR(CZ) GA15-04023S
Grant ostatní: Rada Programu interní podpory projektů mezinárodní spolupráce AV ČR(CZ) M100431201
Program: M
Institucionální podpora: RVO:61389021
Klíčová slova: blue jet * electric field * electron density * ionisation wave * low-pressure air * streamer * transient luminous events
Obor OECD: Fluids and plasma physics (including surface physics)
Impakt faktor: 3.584, rok: 2020
Způsob publikování: Omezený přístup
https://iopscience.iop.org/article/10.1088/1361-6595/ab7087

The emergence of a streamer from an ionisation wave and its expansion are ultra-fast processes shaping the very first moments of the streamer development, and are usually accessible only by complex numerical models. In this Letter, we report experimental evidence of the emergence of a streamer from an ionisation wave in 1.3 kPa air, a laboratory analogue of early-stage streamers emerging in geophysical Blue Starters and Jets. The radially and temporally resolved electric field patterns of an expanding streamer are determined by sub-nanosecond optical emission spectroscopy. As the emerged streamer expands, the electric field decreases by a factor of 1.4 in 1 ns. We quantify the radial expansion of the streamer head and its axial acceleration, reaching the velocity of 107 m s-1. In combination with electrical measurements, the transferred charge, electron density, and mean electron energy are quantified, enabling detailed insight into this ultra-fast phenomenon at its characteristic time-scale.
Trvalý link: http://hdl.handle.net/11104/0309527