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Permanent link (DOI): https://doi.org/10.7939/R3M61C25R

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Theory of Thomson Scattering of Partially Coherent Laser Probes in Plasmas Open Access

Descriptions

Other title
Subject/Keyword
Thomson Scattering
Plasma
Plasma Diagnostics
Partial Coherence
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Javan Roshtkhari, Mehraveh
Supervisor and department
Rozmus, Wojciech (Physics)
Examining committee member and department
Tsui, Ying (Electrical & Computer Engineering)
Sydora, Richard (Physics)
Department
Department of Physics
Specialization

Date accepted
2016-11-01T15:11:42Z
Graduation date
2017-06:Spring 2017
Degree
Master of Science
Degree level
Master's
Abstract
The effect of partial coherence of a probe on the spectrum of Thomson scattered radiation from plasma is investigated. The coherence of a probe is described in terms of the electric field Gaussian correlation function of the finite correlation time (longitudinal coherence) and the finite correlation length (transverse coherence). The Thomson scattering cross section is defined using dynamical form factor, i.e. Fourier transformed correlation function of electron density fluctuations. Two limiting cases of spatial (very large correlation length) and temporal (very long correlation time) coherence are considered. Thomson spectra of scattered radiation are calculated for these two cases and analyzed in the regime of collective plasma response dominated by ion-acoustic and Langmuir wave fluctuations. Partial coherence of the probe (finite coherence time and length) alters the scattered spectrum significantly. Two examples are discussed for each case by varying these two parameters of the correlation function. Finally, using inverse Fourier transforms, a theory is developed to show the possibility of recovering ion acoustic fluctuation spectrum from the scattered light spectrum of the partially coherent pump.
Language
English
DOI
doi:10.7939/R3M61C25R
Rights
This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for the purpose of private, scholarly or scientific research. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
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