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Emerging and expanding streamer head in low-pressure air.

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Title: Emerging and expanding streamer head in low-pressure air.
Authors: Hoder, T (AUTHOR) hoder@physics.muni.cz, Bonaventura, Z (AUTHOR), Prukner, V (AUTHOR), Gordillo-Vázquez, F J (AUTHOR), Šimek, M (AUTHOR)
Source: Plasma Sources Science & Technology. Mar2020, Vol. 29 Issue 3, p1-7. 7p.
Subjects: Emission spectroscopy, Optical spectroscopy, Electric fields, Electron density, Air
Abstract: 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. [ABSTRACT FROM AUTHOR]
Copyright of Plasma Sources Science & Technology is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 145521931
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  Data: Emerging and expanding streamer head in low-pressure air.
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  Data: <searchLink fieldCode="AR" term="%22Hoder%2C+T%22">Hoder, T</searchLink> (AUTHOR)<i> hoder@physics.muni.cz</i><br /><searchLink fieldCode="AR" term="%22Bonaventura%2C+Z%22">Bonaventura, Z</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Prukner%2C+V%22">Prukner, V</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gordillo-Vázquez%2C+F+J%22">Gordillo-Vázquez, F J</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Šimek%2C+M%22">Šimek, M</searchLink> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Plasma+Sources+Science+%26+Technology%22">Plasma Sources Science & Technology</searchLink>. Mar2020, Vol. 29 Issue 3, p1-7. 7p.
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  Data: <searchLink fieldCode="DE" term="%22Emission+spectroscopy%22">Emission spectroscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Optical+spectroscopy%22">Optical spectroscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+fields%22">Electric fields</searchLink><br /><searchLink fieldCode="DE" term="%22Electron+density%22">Electron density</searchLink><br /><searchLink fieldCode="DE" term="%22Air%22">Air</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: 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. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Plasma Sources Science & Technology is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1088/1361-6595/ab7087
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        Text: English
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        Type: general
      – SubjectFull: Optical spectroscopy
        Type: general
      – SubjectFull: Electric fields
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      – SubjectFull: Electron density
        Type: general
      – SubjectFull: Air
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              Text: Mar2020
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