The development of a DSP based system for processing the spectroscopy data on H-1NF

This paper describes a Digital Signal Processor (DSP) based fast data acquisition and processing system for the spectroscopy diagnostic on H-1NF. For argon plasmas, the diagnostic monitors the singly ionized argon spectral line emitted from the plasma along various viewing chords. It has been shown that the three lowest moments of the spectral line carry the information of the line integral of the argon ion emission intensity, argon ion temperature, and argon ion flow velocity along the line of sight respectively. The measurement of the three moments is realized by an electro-optically modulated solid-state spectrometer (MOSS spectrometer). The MOSS spectrometer receives the light emission along one chord in each plasma shot, and scans the plasma region on a shot to shot basis