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We report on the construction and laboratory testing of pixellated CZTdetectors mounted in a flip-chip, tiled fashion and read out by an ASIC, asrequired for proposed hard X-ray astronomy missions. Two 10 mm x 10 mm x 5 mmdetectors were fabricated, one out of standard eV Products high-pressureBridgman CZT and one out of IMARAD horizontal Bridgman CZT. Each was fashionedwith a 4 x 4 array of gold pixels on a 2.5 mm pitch with a surrounding guardring. The detectors were mounted side by side on a carrier card, such that thepixel pitch was preserved, and read out by a 32-channel VA-TA ASIC from IDE ASCorp. controlled by a PC/104 single-board computer. A passive shield/collimatorsurrounded by plastic scintillator encloses the detectors on five sides andprovides a ~40deg field of view. Thus this experiment tests key techniquesrequired for future hard X-ray survey instruments. The experiment was taken toFt Sumner, NM in May 2000 in preparation for a scientific balloon flight aboardthe joint Harvard-MSFC EXITE2/HERO payload. Although we did not receive aflight opportunity, and are currently scheduled to fly in September 2000, wepresent our calibration data in the flight configuration together with dataanalysis techniques and simulations of the expected flight background spectrum.Comment: 12 pages LaTeX, 11 figures, to appear in Proc. SPIE 4140, "X-Ray and  Gamma-Ray Instrumentation for Astronomy XI

Construction and testing of a pixellated CZT detector and shield for a hard x-ray astronomy balloon flight