Time evolution of Lyman-alpha fine-structure components for Al XIII.
We present a comparison of measured and theoretically modeled Lyman-alpha intensity ratios of hydrogenlike Al XIII impurity ions in a deuterium base plasma in the COMPASS-D tokamak. The time evolution of the intensity ratios is computed from a collisional-radiative model using measured plasma parameters and compared with line-of-sight integral values measured using a high-resolution crystal spectrometer. The variations in the modeled values follow the experimental data in the case of the L-mode plasma, taking into account variations in the electron parameters during the discharges. Apparent discrepancies between the observed and calculated ratios in the case of the H-mode plasma are attributed to line blending due to satellites of nearby Fe emission.
Clare Hall, University of Cambridge, Cambridge CB3 9AL, England. J.M.A.Ashbourn@damtp.cam.ac.uk
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JM
Ashbourn
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IM
Melnick
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Peacock