Thomson and collisional regimes of in-phase coherent microwave scattering off gaseous microplasmas

Abstract The total number of electrons in a classical microplasma can be non-intrusively measured through elastic in-phase coherent microwave scattering (CMS). Here, we establish a theoretical basis for the CMS diagnostic technique with an emphasis on Thomson and collisional scattering in short, thi...

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Autores principales:	Adam R. Patel, Apoorv Ranjan, Xingxing Wang, Mikhail N. Slipchenko, Mikhail N. Shneider, Alexey Shashurin
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/fa7b308254a64f6c816243a5cff1aaad
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spelling	oai:doaj.org-article:fa7b308254a64f6c816243a5cff1aaad2021-12-05T12:14:19ZThomson and collisional regimes of in-phase coherent microwave scattering off gaseous microplasmas10.1038/s41598-021-02500-y2045-2322https://doaj.org/article/fa7b308254a64f6c816243a5cff1aaad2021-12-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-02500-yhttps://doaj.org/toc/2045-2322Abstract The total number of electrons in a classical microplasma can be non-intrusively measured through elastic in-phase coherent microwave scattering (CMS). Here, we establish a theoretical basis for the CMS diagnostic technique with an emphasis on Thomson and collisional scattering in short, thin unmagnetized plasma media. Experimental validation of the diagnostic is subsequently performed via linearly polarized, variable frequency (10.5–12 GHz) microwave scattering off laser induced 1–760 Torr air-based microplasmas (287.5 nm O2 resonant photoionization by ~ 5 ns, < 3 mJ pulses) with diverse ionization and collisional features. Namely, conducted studies include a verification of short-dipole-like radiation behavior, plasma volume imaging via ICCD photography, and measurements of relative phases, total scattering cross-sections, and total number of electrons $$N_{e}$$ N e in the generated plasma filaments following absolute calibration using a dielectric scattering sample. Findings of the paper suggest an ideality of CMS in the Thomson “free-electron” regime—where a detailed knowledge of plasma and collisional properties (which are often difficult to accurately characterize due to the potential influence of inhomogeneities, local temperatures and densities, present species, and so on) is unnecessary to extract $$N_{e}$$ N e from the scattered signal. The Thomson scattering regime of microwaves is further experimentally verified via measurements of the relative phase between the incident electric field and electron displacement.Adam R. PatelApoorv RanjanXingxing WangMikhail N. SlipchenkoMikhail N. ShneiderAlexey ShashurinNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Adam R. Patel Apoorv Ranjan Xingxing Wang Mikhail N. Slipchenko Mikhail N. Shneider Alexey Shashurin Thomson and collisional regimes of in-phase coherent microwave scattering off gaseous microplasmas
description	Abstract The total number of electrons in a classical microplasma can be non-intrusively measured through elastic in-phase coherent microwave scattering (CMS). Here, we establish a theoretical basis for the CMS diagnostic technique with an emphasis on Thomson and collisional scattering in short, thin unmagnetized plasma media. Experimental validation of the diagnostic is subsequently performed via linearly polarized, variable frequency (10.5–12 GHz) microwave scattering off laser induced 1–760 Torr air-based microplasmas (287.5 nm O2 resonant photoionization by ~ 5 ns, < 3 mJ pulses) with diverse ionization and collisional features. Namely, conducted studies include a verification of short-dipole-like radiation behavior, plasma volume imaging via ICCD photography, and measurements of relative phases, total scattering cross-sections, and total number of electrons $$N_{e}$$ N e in the generated plasma filaments following absolute calibration using a dielectric scattering sample. Findings of the paper suggest an ideality of CMS in the Thomson “free-electron” regime—where a detailed knowledge of plasma and collisional properties (which are often difficult to accurately characterize due to the potential influence of inhomogeneities, local temperatures and densities, present species, and so on) is unnecessary to extract $$N_{e}$$ N e from the scattered signal. The Thomson scattering regime of microwaves is further experimentally verified via measurements of the relative phase between the incident electric field and electron displacement.
format	article
author	Adam R. Patel Apoorv Ranjan Xingxing Wang Mikhail N. Slipchenko Mikhail N. Shneider Alexey Shashurin
author_facet	Adam R. Patel Apoorv Ranjan Xingxing Wang Mikhail N. Slipchenko Mikhail N. Shneider Alexey Shashurin
author_sort	Adam R. Patel
title	Thomson and collisional regimes of in-phase coherent microwave scattering off gaseous microplasmas
title_short	Thomson and collisional regimes of in-phase coherent microwave scattering off gaseous microplasmas
title_full	Thomson and collisional regimes of in-phase coherent microwave scattering off gaseous microplasmas
title_fullStr	Thomson and collisional regimes of in-phase coherent microwave scattering off gaseous microplasmas
title_full_unstemmed	Thomson and collisional regimes of in-phase coherent microwave scattering off gaseous microplasmas
title_sort	thomson and collisional regimes of in-phase coherent microwave scattering off gaseous microplasmas
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/fa7b308254a64f6c816243a5cff1aaad
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Thomson and collisional regimes of in-phase coherent microwave scattering off gaseous microplasmas

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