Spectroscopy of plasmas with a multifiber commutator

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Abstract
Spatially resolved spectra have been obtained, during a single discharge, with one spectrometer using an optical multifiber commutator (OMC). We report results from this device which can be preprogrammed to select up to nine viewing chords, via high transmission optical fibers. This arrangement has been incorporated with a multichannel (OMA) spectrometer, where the fiber-to-fiber switching time matches the basic video scan of the detector (16 ms). The spectrometer can be operated in medium resolution mode (0.3 Å) with a conventional grating or with high resolution (0.05 Å) by substituting an echelle grating. The apparatus has been used for the evaluation of ion temperatures in the source and extraction regions of the Culham negative ion source. It is presently employed in JET for the study of the relative impurity influxes from the wall, the limiters, and the rf antennas.

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