Simultaneous measurement of electron and heavy particle temperatures in He laser-induced plasma by Thomson and Rayleigh scattering

Thomson and Rayleigh scattering methods were applied to quantify the electron and heavy particle temperatures, as well as electron number density, in a laser spark in helium at atmospheric pressure. Plasma was created using 4.5 ns, 25 mJ pulses from Nd:YAG laser at 532 nm. Measurements, performed fo...

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Bibliographic Details
Published in:Applied physics letters 2013-04, Vol.102 (13)
Main Authors: Dzierżęga, K., Mendys, A., Pokrzywka, B., Zawadzki, W., Pellerin, S.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ATMOSPHERIC PRESSURE
BREAKDOWN
DENSITY
ELECTRON DENSITY
ELECTRONS
EQUILIBRIUM
HELIUM
NEODYMIUM LASERS
PARTICLES
Physics
PLASMA DENSITY
PLASMA DIAGNOSTICS
Plasma Physics
PLASMA PRODUCTION
PULSES
RAYLEIGH SCATTERING
TEMPERATURE MEASUREMENT
THOMSON SCATTERING
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Summary:Thomson and Rayleigh scattering methods were applied to quantify the electron and heavy particle temperatures, as well as electron number density, in a laser spark in helium at atmospheric pressure. Plasma was created using 4.5 ns, 25 mJ pulses from Nd:YAG laser at 532 nm. Measurements, performed for the time interval between 20 ns and 800 ns after breakdown, show electron density and temperature to decrease from 7.8×1023 m−3 to 2.6×1022 m−3 and from 95 900 K to 10 350 K, respectively. At the same time, the heavy particle temperature drops from only 47 000 K down to 4100 K which indicates a two temperature plasma out of local isothermal equilibrium.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4801467