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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|
|Pages:||pp. 024505-1 - 024505-5|
|Keywords:||absolute cryogenic radiometer, paramagnetic salt thermometer, radiometry, SQUID readout, transition edge sensor|
|PDF version:||Click here to retrieve PDF version of paper (177KB)|