Collective scattering and optical probing as turbulence diagnostics

P.J. vd Mortel, D.C. Schram

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Abstract

Small scale turbulence is a very important phenomenon in magnetized plasmas. Turbulence is generally described by dividing it in sets of waves. Alternatively turbulence can be interpreted as a set of moving local density fluctuations. In a current driven plasmas local electron density perturbations have a strong coupling with turbulence. There are few diagnostics which can register electron density fluctuations inside a plasma. These diagnostics are either founded on emission or scattering of electromagnetic radiation. With respect to the emission the authors assume the increase of emitted radiation to be proportional to the increase in electron density. With scattering the use of heterodyne detection increases the sensitivity enormously. With small angle scattering one need to use infrared radiation to be able to resolve sub millimeter fluctuations. Both diagnostics are discussed. The authors show that separately they give only limited information but together they are a powerful tool to study plasma perturbations
Original languageEnglish
Title of host publicationTurbulence and Anomalous Transport in Magnetized Plasmas : Proceedings of the International Workshop on Small Scale Turbulence and Anomalous Transport in Magnetized Plasmas / Ed. D. Gresillon, M.A. Dubois
Place of PublicationPalaiseau, France
PublisherEcole Polytech
Pages315-318
ISBN (Print)2730201483
Publication statusPublished - 1987

Publication series

NameCargese plasma turbulence series
Volume4

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