A novel Thomson scattering diagnostic for the Alcator C-Mod tokamak is nearing operation. A vertically oriented 1-J Nd:YAG laser beam will be viewed along eleven (initially six) quasihorizontal chords simultaneously for one-dimensional profiles every laser pulse. Each chord is viewed by a Wadsworth grating spectrometer. Laser operation at 50 pps gives a coarse time axis. A counterrotating prism arrangement steps the laser position by up to 2 cm between pulses, allowing full two-dimensional profiles to be obtained over 160 ms (within the 14-cm accessible plasma region) during a single shot. Design details, calibration results, and control system and alignment details are presented.
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Casey et al. (1992) studied this question.
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