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Through the first 3 months of 2003 the University of Pennsyvlania worked on finalizing the detailed design of the Penn Array Receiver. The cryogenic temperature monitor and control system was designed and built, allowing in detailed characterization of the pulse tube cooler and sorbtion fridges. The optics design has been taken to a nearly final stage; an important step was determining that anti-reflective coating of quartz lenses for the reimaging optics was possible, allowing their use instead of higher-loss HDPE. Extensive study of the ghosting, loading, diffraction, and other properties of the optics have been conducted. The receiver optics will accomadate a variety of array sizes and geometries. The transition-edge superconducter recipe at Goddard is in the final stages of fine tuning based on detector parameters agreed upon in December of 2002 . Detector housings and thermal isolators have been designed and built, and a blackbody horn for future lab tests was also designed. The Green Bank electronics division assisted Penn in the preliminary stages of designing a package which would meet local RFI requirements. A CDR is planned for Q2 2003.

-- BrianMason - 06 Oct 2003