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The High Energy X-Ray Timing Experiment (HEXTE) instrument is nearing completion and is scheduled for launch in August, 1995 on the X-Ray Timing Explorer (XTE). As part of an instrument complement designed to study the temporal and spectral characteristics of the X-ray sky, the HEXTE features large collecting area and low background with careful control of systematic effects for observations in the 15 to 200 keV energy range. The operating characteristics of the flight subsystems, including phoswich detectors, anticoincidence shields, gain control and aperture modulation components are described. Quantitative performance results are given which indicate that the HEXTE will meet or exceed its design goals.
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