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A high resolution multiposition Thomson scattering system for the Rijnhuizen Tokamak Project

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8 Author(s)
Barth, C.J. ; FOM-Instituut voor Plasmafysica `Rijnhuizen'', Association EURATOM-FOM, P.O. Box 1207, 3430 BE Nieuwegein, The Netherlands ; Beurskens, M.N.A. ; Chu, C.C. ; Donné, A.J.H.
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A high resolution multiposition Thomson scattering setup to measure the electron temperature (Te) and density (ne) of a hot plasma is described. The system is operational at the Rijnhuizen Tokamak Project. Light from a high power pulsed ruby laser is scattered by the free plasma electrons and relayed to a Littrow polychromator for spectral analysis. The spectrally and spatially resolved light is detected by a GaAsP photocathode. The two-dimensional image is intensified and recorded with a charge-coupled device camera. Te in the range of 50 eV–6 keV can be measured at 115 spatial elements of 2.6 mm length along the laser beam. The observation error is ≪6% at ne=2×1019 m-3 and smaller for higher ne. The high resolution and accuracy enabled the observation of small scale structures in Te and ne. © 1997 American Institute of Physics.

Published in:

Review of Scientific Instruments  (Volume:68 ,  Issue: 9 )