Laser Spark-Free Initiation of a Subcritical Microwave Discharge

Experimental study has been made of the ignition of a subcritical microwave discharge at pressures in the range 55–79 Torr with the initiation by pulsed laser radiation (58 mJ in a pulse). A rise of 36% in the critical pressure was obtained to form the discharge with the orientation of the laser bea...

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Bibliographic Details
Published in:Journal of engineering physics and thermophysics 2024-07, Vol.97 (4), p.1068-1081
Main Authors: Dobrov, Yu. V., Lashkov, V. A., Mashek, I. Ch, Prokshin, A. M., Renev, M. E., Khoronzhuk, R. S.
Format: Article
Language:English
Subjects:
Classical Mechanics
Complex Systems
Critical pressure
Engineering
Engineering Thermodynamics
Field strength
Heat and Mass Transfer
Industrial Chemistry/Chemical Engineering
Laser beams
Microwave discharge
Pulsed lasers
Thermodynamics
Transfer Processes in Low-Temperature Plasma
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Summary:Experimental study has been made of the ignition of a subcritical microwave discharge at pressures in the range 55–79 Torr with the initiation by pulsed laser radiation (58 mJ in a pulse). A rise of 36% in the critical pressure was obtained to form the discharge with the orientation of the laser beam along the vector of the microwave-field strength. Computer modeling has shown that upon the traversal of a focused laser beam, a highly conductive laser trail can be formed with a peak ionization degree as high as 10%, which, for a period of the order of 1 μs, locally enhances the electric microwave field up to supercritical values.
ISSN:1062-0125
1573-871X
DOI:10.1007/s10891-024-02978-z