Determination of Hα emissivities from line integrated brightness measurements on Alcator C-Mod

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Abstract
Alcator C-Mod is equipped with a 227 chord visible light imaging system. Using a nonlinearly constrained least-squares algorithm, local emissivities have been obtained from the chordal brightness measurements without any assumptions about poloidal symmetry. The robustness of the inversion to noise and calibration errors as well as the spatial information (∼5-cm resolution) obtainable has been examined in detail. Some examples, demonstrating how results from the tomographic reconstruction of the Hα light can be used to calculate a particle confinement time and neutral density are given. Different interference filters in front of the arrays allow the same technique to be applied to other atomic species.

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