Bolometers operated at 0.1 K and 0.2 K cooled by adiabatic demagnetization |
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Authors: | Larry Lesyna Thomas P. L. Roellig Peter Kittel |
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Affiliation: | 1. Center for Space Science and Astrophysics, Stanford University, 94305, Stanford, CA 2. NASA-Ames Research Center, 94035, Moffett Field, CA
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Abstract: | We have constructed bolometers operating at temperatures of 0.1 K and 0.2 K cooled by adiabatic demagnetization. The electrical noise equivalent power (NEP) of the bolometers was found to be 1.8×10?16 W/Hz1/2 and 6.6×10?16 W/Hz1/2 respectively. These values are within a factor of two of the expected performance based upon bolometer theory. The thermistor material used was gallium doped single crystal germanium, for which we find a resistivity temperature dependence of the form ρ = ρo exp (AT?1/2). |
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