Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session TI02: Fundamental/Low Temperature Plasmas
9:30 AM–12:30 PM,
Thursday, October 20, 2022
Room: Ballroom 100 B
Chair: Zhehui Wang, LANL
Abstract: TI02.00003 : Coherent microwave scattering for diagnostics of small-size plasma objects*
10:30 AM–11:00 AM
Presenter:
Alexey Shashurin
(Purdue University)
Author:
Alexey Shashurin
(Purdue University)
Collaboration:
The author would like to thank Mikhail N. Shneider, Mikhail N. Slipchenko, Sergey Macheret, Michael Keidar, Adam R. Patel, Xingxing Wang, Animesh Sharma, and Apoorv Ranjan for valuable contributions.
Fundamentals of the coherent microwave scattering with an emphasis on Thomson, collisional, and Rayleigh scattering in short, thin unmagnetized plasma media will be considered. Ideality of the CMS technique in the Thomson “free-electron” regime will be reviewed where a detailed knowledge of collisional properties (which are often difficult to accurately characterize) is unnecessary to extract electron number measurement from the scattered signal. Substantially higher sensitivity of the CMS in comparison with the incoherent counterpart in the optical frequency domain (laser Thomson scattering) will be discussed. Finally, several examples of the CMS application for diagnostics of small-size plasmas will be considered including nanosecond repetitively pulsed discharges in air and laser-induced ionization of various gases in UV, NIR, and mid-IR spectral ranges.
*This work was supported by the U.S. by the National Science Foundation (NSF) (Grant No. 1903415) and Department of Energy (Grant No. DE-SC0018156).
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