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Demonstration of a Meissner-Effect Transition Edge Sensor

Published

Author(s)

Solomon I. Woods, Stephen M. Carr, Timothy M. Jung, Adriaan C. Carter, Raju V. Datla

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

Keywords

absolute cryogenic radiometer, paramagnetic salt thermometer, radiometry, SQUID readout, transition edge sensor
Created July 26, 2010, Updated February 19, 2017