Deeply undercritical microwave discharge excited by the field of a quasi-optical electromagnetic beam in a supersonic air jet |
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| Authors: | D. V. Bychkov L. P. Grachev I. I. Esakov |
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| Affiliation: | (1) Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, MD 20742-3511, USA;(2) Graduate Program in Nuclear Engineering, A. James Clark School of Engineering, University of Maryland, College Park, MD 20742-3511, USA;(3) Center for Space Physics, Boston University, Boston, MA 02215, USA;(4) Department of Astronomy, University of Maryland, College Park, MD 20742, USA;(5) Consortium GYCOM, Nizhny Novgorod, 603600, Russia |
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| Abstract: | Electric discharge in a supersonic air jet is studied. It is ignited in a linearly polarized quasi-optical microwave electromagnetic beam the initial field intensity of which is much lower than the breakdown level. Electric breakdown is initiated by a tubular electromagnetic vibrator, one end of which has spikes and is covered by a quartz tube. Atmospheric air enters into a low-pressure working chamber through the inner channel of the vibrator. As a result, an immersed supersonic air jet forms in the chamber at the outlet from the quartz tube. A microwave discharge ignited in this jet is “attached” to aft spikes of the vibrator. The energy deposit into the discharge plasma and the effective area of energy interaction between the discharge and excited microwave field are estimated from the temperature and stagnation pressure distributions in the wake of the discharge. |
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