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Abstract

In very far forward scattering experiments on TOSCA tokamak in which 10.6 mum wavelength laser radiation is directed across a vertical minor diameter, oscillations induced on the beam profile by plasma density fluctuations are found to be asymmetric with respect to the beam axis. A model describing counter-rotating waves, such as a poloidal structure met twice by the probe beam as it traverses the plasma is able to furnish a satisfactory fit to the data. Coherent modes, identified as rotating m=2 magnetic islands are seen, as well as wideband fluctuations whose power spectrum falls as v**-2.5. Wavelengths from 0.2 cm to 10 cm are measured, and waves at the top of the torus appear to be twice as intense as those at the bottom.

Additional information

Authors: COTE A, CULHAM LABORATORY, ABINGDON (UK);DOYLE E J, CULHAM LABORATORY, ABINGDON (UK);EVANS D E, CULHAM LABORATORY, ABINGDON (UK);SONODA Y CULHAM LABORATORY, ABINGDON (UK), CULHAM LABORATORY, ABINGDON (UK)
Bibliographic Reference: 2ND INTERNATIONAL SYMPOSIUM ON LASER AIDED PLASMA DIAGNOSTICS, CULHAM (UK), SEPT. 10-12, 1985 PP. 85-89
Record Number: 1989124103600 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en