Discharge in the Atmosphere in a Gaussian Beam of Subthreshold Millimeter Waves |
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Authors: | K V Artem’ev G M Batanov N K Berezhetskaya V D Borzosekov L V Kolik E M Konchekov I A Kossyi D V Malakhov A E Petrov K A Sarksyan V D Stepakhin N K Kharchev |
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Institution: | 1.Prokhorov General Physics Institute,Russian Academy of Sciences,Moscow,Russia;2.Pirogov Russian National Research Medical University,Moscow,Russia;3.Moscow Technological University (MIREA),Moscow,Russia |
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Abstract: | The propagation velocities of a subthreshold discharge excited in air at atmospheric pressure by a pulsed microwave beam with a Gaussian field distribution, a wavelength of 4 mm, and an intensity up to 30 kW/cm2 have been measured by means of optical and microwave diagnostics. It has been shown that the motion of a discharge front along the path of the beam toward the region of an increasing microwave field is accompanied by an increase in the velocity from subsonic (~10–4 cm/s) to supersonic (~(6–8) × 104 cm/s). At the same time, motion toward the decreasing field region is accompanied by a decrease in the velocity from supersonic to subsonic. It has been found that the maximum temperature of the gas in the discharge at velocities of ~104 cm/s reaches ~5.3 kK. |
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