Thor M. Wilbanks

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The design and construction of 300-mK composite bolometers developed for millimeter-wave astronomical observations are described. Graphite fibers are used as the electrical leads for the thermistor to reduce the thermal conductance and heat capacity associated with the leads. A mechanical suspension made of Nylon fibers odes the required thermal(More)
A differential radiometer can be constructed by placing two matched bolometric detectors in an ac bridge, thus producing a signal that is proportional to the difference in power incident on the two detectors. In conditions of large and time-varying common-mode radiative load, the common-mode response resulting from imperfectly matched detectors can limit(More)
We report millimeter-wavelength observations of the Sunyaev-Zel'dovich (S-Z) effect in two distant galaxy clusters. A relativistically correct analysis of the S-Z data is combined with the results of X-ray observations to determine the radial peculiar velocities (v r) of the clusters. We observed Abell 2163 (z = .201) in three mm-wavelength bands centered(More)
We present limits to anisotropies in the cosmic microwave background radiation (CMB) at angular scales of a few arcminutes. The observations were made at a frequency of 142 GHz using a 6-element bolometer array (the Sunyaev-Zel'dovich Infrared Experiment) at the Caltech Submillimeter Observatory. Two patches of sky, each approximately 36 ′ × 4 ′ and free of(More)
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