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Investigation of magnesium laser ablated plumes with Thomson scattering

Published online by Cambridge University Press:  09 March 2012

E. Nedanovska
Affiliation:
Centre for Plasma Physics, School of Mathematics and Physics, Queen's University Belfast, Belfast, United Kingdom
G. Nersisyan
Affiliation:
Centre for Plasma Physics, School of Mathematics and Physics, Queen's University Belfast, Belfast, United Kingdom
C.L.S. Lewis
Affiliation:
Centre for Plasma Physics, School of Mathematics and Physics, Queen's University Belfast, Belfast, United Kingdom
D. Riley*
Affiliation:
Centre for Plasma Physics, School of Mathematics and Physics, Queen's University Belfast, Belfast, United Kingdom
*
Address correspondence and reprint requests to: D. Riley, School of Mathematics and Physics, Queen's University Belfast, Belfast, BT7 1NN, United Kingdom. E-mail: [email protected]

Abstract

Optical Thomson scattering has been implemented as a diagnostic of laser ablated plumes generated with second harmonic Nd:YAG laser radiation at 532 nm. Thomson scattering data with both spatial and temporal resolution has been collected, giving both electron density, and temperature distributions within the plume as a function of time. Although the spatial profiles do not match very well for simple models assuming either isothermal or isentropic expansion, consideration of the measured ablated mass indicates an isothermal expansion fits better than an isentropic expansion and indeed, at late time, the spatial profile of temperature is almost consistent with an isothermal approximation.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2012

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