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Microwave discharge initiated by double laser spark in a supersonic airflow

Published online by Cambridge University Press:  30 January 2015

R. S. Khoronzhuk ,
A. G. Karpenko ,
V. A. Lashkov ,
D. P. Potapeko  and
I. Ch. Mashek
R. S. Khoronzhuk*
Affiliation:
Physical Faculty, Saint Petersburg State University, Saint Petersburg, 198504, Russia
A. G. Karpenko
Affiliation:
Mathematics and Mechanics Faculty, Saint Petersburg State University, Saint Petersburg, 198504, Russia
V. A. Lashkov
Affiliation:
Mathematics and Mechanics Faculty, Saint Petersburg State University, Saint Petersburg, 198504, Russia
D. P. Potapeko
Affiliation:
Physical Faculty, Saint Petersburg State University, Saint Petersburg, 198504, Russia
I. Ch. Mashek
Affiliation:
Physical Faculty, Saint Petersburg State University, Saint Petersburg, 198504, Russia
*
†Email address for correspondence: khoronzhuk@gmail.com
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Abstract

In this paper, we report the results of an experimental study of microwave (MW) discharge in the supersonic flow initiated by the laser spark and numerical simulation of multiple laser spark shockwave structures in airflow. The MW discharge initiation has been produced by single and double laser sparks. By using different spatial and temporal configuration of laser sparks in supersonic flow, we demonstrate the feasibility of an MW breakdown threshold decrease and control over shape and location of MW plasma. Calculation of laser spark shock wave structures shows good agreement with experimental shadow photographs both in the front shock wave diameter and its internal structure.

Type
Research Article
Information
Journal of Plasma Physics , Volume 81 , Issue 3 , June 2015 , 905810307
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Copyright
Copyright © Cambridge University Press 2015 

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