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Publication Citation: Demonstration of a Meissner-Effect Transition Edge Sensor

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Author(s): Solomon I. Woods; Stephen M. Carr; Timothy M. Jung; Adriaan C. Carter; Raju V. Datla;
Title: Demonstration of a Meissner-Effect Transition Edge Sensor
Published: July 26, 2010
Abstract: We have built and tested a transition edge sensor which monitors temperature change by measuring magnetic flux expulsion from a superconducting element. Flux change is sensed by a dc SQUID coupled to the element using a flux transformer in a gradiometer arrangement. The operating temperature of the sensor can be varied by application of moderate magnetic fields to the superconducting core, using an integrated solenoid. With a Sn core at 3.58 K, the thermometer has demonstrated a noise level of 2.25 nK/rtHz. We estimate that such a sensor will allow femtowatt sensitivity of an absolute cryogenic radiometer presently under development.
Citation: Journal of Applied Physics
Volume: 108
Pages: pp. 024505-1 - 024505-5
Keywords: absolute cryogenic radiometer; paramagnetic salt thermometer; radiometry; SQUID readout; transition edge sensor
Research Areas: Radiometry
PDF version: PDF Document Click here to retrieve PDF version of paper (177KB)