Experimental study on hard x-rays emitted from metre-scale negative discharges in air

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Abstract

We investigate the development of metre long negative discharges and focus on their x-ray emissions. We describe appearance, timing and spatial distribution of the x-rays. They appear in bursts of nanosecond duration mostly in the cathode area. The spectrum can be characterized by an exponential function with 200¿keV characteristic photon energy. With nanosecond-fast photography we took detailed images of the pre-breakdown phenomena during the time when x-rays were registered. We found bipolar discharge structures, also called 'pilot systems', in the vicinity of the cathode. As in our previous study of x-rays from positive discharges, we correlate the x-ray emission with encounters between positive and negative streamers. We suggest that a similar process is responsible for x-rays generated by lightning leaders.
Original languageEnglish
Pages (from-to)025205-1/13
Number of pages14
JournalJournal of Physics D: Applied Physics
Volume48
Issue number2
DOIs
Publication statusPublished - 21 Jan 2015

Fingerprint

Discharge (fluid mechanics)
X rays
air
Air
x rays
Cathodes
cathodes
Exponential functions
photography
exponential functions
lightning
Photography
Lightning
encounters
Spatial distribution
bursts
spatial distribution
Photons
breakdown
time measurement

Keywords

  • discharge
  • x-ray
  • lightning
  • streamer
  • leader
  • experimental
  • pilot system

Cite this

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title = "Experimental study on hard x-rays emitted from metre-scale negative discharges in air",
abstract = "We investigate the development of metre long negative discharges and focus on their x-ray emissions. We describe appearance, timing and spatial distribution of the x-rays. They appear in bursts of nanosecond duration mostly in the cathode area. The spectrum can be characterized by an exponential function with 200¿keV characteristic photon energy. With nanosecond-fast photography we took detailed images of the pre-breakdown phenomena during the time when x-rays were registered. We found bipolar discharge structures, also called 'pilot systems', in the vicinity of the cathode. As in our previous study of x-rays from positive discharges, we correlate the x-ray emission with encounters between positive and negative streamers. We suggest that a similar process is responsible for x-rays generated by lightning leaders.",
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Experimental study on hard x-rays emitted from metre-scale negative discharges in air. / Kochkin, P.; Deursen, van, A.P.J.; Ebert, U.

In: Journal of Physics D: Applied Physics, Vol. 48, No. 2, 21.01.2015, p. 025205-1/13.

Research output: Contribution to journalArticleAcademicpeer-review

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AB - We investigate the development of metre long negative discharges and focus on their x-ray emissions. We describe appearance, timing and spatial distribution of the x-rays. They appear in bursts of nanosecond duration mostly in the cathode area. The spectrum can be characterized by an exponential function with 200¿keV characteristic photon energy. With nanosecond-fast photography we took detailed images of the pre-breakdown phenomena during the time when x-rays were registered. We found bipolar discharge structures, also called 'pilot systems', in the vicinity of the cathode. As in our previous study of x-rays from positive discharges, we correlate the x-ray emission with encounters between positive and negative streamers. We suggest that a similar process is responsible for x-rays generated by lightning leaders.

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