The MOSS (Modulated Optical Solid-State) spectroscopic camera has been developed for temporal and spatial measurements of the temperature T_s and flow speed V_s of plasma ions and neutrals from the Doppler broadening of transition radiation. It is a modulated, fixed delay Fourier transform spectrometer [1,2], which measures the three lowest spectral moments of a given spectral line (quantities related to the light intensity, centre frequency, and line width). It is able to resolve the relative direction of flows and can provide information about the poloidal plasma rotation. In addition, it can spatially resolve the average temperature along its viewing chords, which, subject to the assumption that flux surfaces are isotherms, can be tomographically unfolded to yield the temperature profile T(#rho#), where #rho# is the flux surface label.
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