J.G. Tuttle, T.R. Stevenson, E.R. Canavan, M.J. DiPirro, D.E. Franz, P.J. Shirron,
Code 552
Cryogenics and Fluids Branch
NASA/Goddard Space Flight Center, Greenbelt, MD 20771
Magnetic thermometers are less sensitive to self-heating due to radio-frequency noise than are traditional resistive thermometers. This makes them appealing at temperatures well below 0.1 Kelvin in the operating range of many space-flight detectors. We have built and tested a magnetic thermometer which is deposited directly onto a substrate. This device, which uses the temperatuer dependence of iron-doped palladium's magnetic susceptibility, includes self-shielding deposited coils surrounding a sputtered palladium layer. It is read out using a SQUID to achieve high resollutino. Its small size and very good heat-sinking should eventually make it useful forthe temperature control of space flight detector arrays, in particular those already using SQUID readouts. The design and test results for this device are discussed.
Advances in Cryogenic Engineering: Transactions of the Cryogenic Engineering Conference - CEC Vol 49A, p. 396-403 (2004).