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Initial Measurements from an Ultrashort-Pulse Reflectometer on GAMMA 10

Initial results from an ultrashort-pulse reflectometer on the GAMMA 10 tandem mirror are presented. The diagnostic uses an impulse generator (8 V, 65 ps full-width at half maximum) as its microwave source, and the four-channel receiver system measures the time-of-flight for ordinary-mode polarized reflected waves at 8, 9, 10 and 11 GHz. The reflectometer tracks electron density fluctuations well over portions of the discharge, while overall values of the time-of-flight are in rough agreement with calculated values using Abel-inverted profiles from interferometry data. These results demonstrate the potential of the current system for time-resolved electron density profile measurements on GAMMA 10.