A rapid-frequency-scan laser for measurement of velocity distribution of impurities in plasmas by fluorescence spectroscopy
- 14 October 1983
- journal article
- Published by IOP Publishing in Journal of Physics D: Applied Physics
- Vol. 16 (10), 1943-1952
- https://doi.org/10.1088/0022-3727/16/10/018
Abstract
Laser fluorescence spectroscopy is a useful technique to determine the density and the flux of metallic atom impurities in the edge region of Tokamaks. A new scheme to measure the Doppler profile of impurity atoms by a single laser shot is proposed. The frequency of dye-laser emission is rapidly scanned across the Doppler profile during the laser action in the order of microseconds. A flashlamp-pumped dye laser is tuned by a piezoelectrically scanned etalon, and a scanning range of 60 pm is obtained with a resolution of 3 pm at lambda approximately=600 nm. Fluorescence line profiles of Na atoms are determined with a resolution of less than 1 pm. Several problems of Tokamak measurements are briefly discussed.Keywords
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