Abstract
We report on the design and construction of an 8×8 bolometer array designed to operate at 90GHz on the new 100m Green Bank Telescope (GBT). The bolometers are Transition Edge Superconducting (TES) detectors read out using a SQUID multiplexing system. The receiver will be one of the first astronomical instruments to use such detectors. To cool the detectors, we have developed 3He and 4He sorption refrigerators that cycle from a two-stage pulse-tube cryocooler. The system has been demonstrated to be robust, to be capable of cycling autonomously, and to provide 15μW of cooling below 286mK with a hold time over 70h. Although modest in size, a combination of the size of GBT and the low noise of the TES detectors will make our receiver one of the most sensitive of its kind.
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