NDLI: Spectral line shapes modeling in turbulent plasmas

Content Provider	Springer Nature Link
Author	Marandet, Y. Capes, H. Godbert Mouret, L. Koubiti, M. Rosato, J. Stamm, R.
Copyright Year	2006
Abstract	In this work we investigate the influence of low frequency turbulence on Doppler spectral line shapes in magnetized plasmas. Low frequency refers here to fluctuations whose typical time scale is much larger than those characterizing the atomic processes, such as radiative decay, collisions and charge exchange. This ordering is in particular relevant for drift wave turbulence, ubiquitous in edge plasmas of fusion devices. Turbulent fluctuations are found to affect line shapes through both the spatial and time averages introduced by the measurement process. The profile is expressed in terms of the fluid fields describing the plasma. Assuming the spectrometer acquisition time to be much larger than the turbulent time scale, an ordering generally fulfilled in experiments, allows to develop a statistical formalism. We proceed by successively investigating the effects of density, fluid velocity and temperature fluctuations on the Doppler profile of a spectral line emitted by a charge exchange population of neutrals. Line shapes, and especially line wings are found to be affected by ion temperature or fluid velocity fluctuations, and can in some cases exhibit a power-law behavior. These effects are shown to be measurable with existing techniques, and their interpretation in each particular case would rely on already existing tools. From a fundamental point of view, this study gives some insights in the appearance of non-Boltzmann statistics, such as Lévy statistics, when dealing with averaged experimental data.
Starting Page	247
Ending Page	260
Page Count	14
File Format	PDF
ISSN	14346060
Journal	The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics
Volume Number	39
Issue Number	2
e-ISSN	14346079
Language	English
Publisher	EDP Sciences
Publisher Date	2006-05-18
Publisher Place	Les Ulis
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Quantum Physics Quantum Computing, Information and Physics Complexity Atoms, Molecules, Clusters and Plasmas Solid State Physics and Spectroscopy Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics

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