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Stochastic Processes Applied to the Spectroscopic Diagnostic of Hydrogen in Edge Plasmas
Author(s) -
Hannachi I.,
Capes H.,
GodbertMouret L.,
Guzman F.,
Koubiti M.,
Marandet Y.,
Rosato J.,
Meftah M.T.,
Stamm R.
Publication year - 2014
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.201410035
Subject(s) - stark effect , plasma , line (geometry) , amplitude , physics , atomic physics , hydrogen , ion , electric field , langmuir probe , hydrogen line , enhanced data rates for gsm evolution , plasma oscillation , computational physics , stochastic process , plasma diagnostics , optics , quantum mechanics , mathematics , computer science , statistics , telecommunications , geometry
Stochastic processes may be used as an efficient model for the line shapes affected by Stark effect in edge plasma conditions. We check the accuracy of this approach on the Lyman γ line of hydrogen perturbed by ions only. We also use a stochastic process to investigate the effect of plasma oscillations on a line shape. Our model assumes that Langmuir waves are a sequence of oscillating electric fields changing their amplitude and phase according to an exponential waiting time distribution. The possible effects of Langmuir waves on the Lyman α Stark profile are discussed in edge plasma conditions. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)