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Digital Tracker Array Radiation Test Report
For the Digital Tracker Array (DTA) program, there were some unique concerns and constraints, which needed to be addressed. The primary component of this design was a hybrid sensor based on the Massachusetts Institute of Technology Lincoln Laboratory (MIT LL) Digital-pixel Focal Plane Array (DFPA) which was bump-bonded to InGaAs short wave band infrared detectors. Though used successfully in ground experiments, its space capability was an open question. In particular, the CMOS-based design and its susceptibility to radiation was unknown. Further, because the design of the package was extremely size, weight, and power constrained, radiation mitigation could become a problem (BISA, Belgian Institute for Space Aeronomy, 2019).
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