Current Sensing Noise Thermometry: A fast practical solution to low temperature measurement
Abstract
We describe the design and performance of a series of fast, precise current sensing noise thermometers. The thermometers have been fabricated with a range of resistances from 1.290 down to 0.2 m. This results in either a thermometer that has been optimised for speed, taking advantage of the improvements in superconducting quantum interference device (SQUID) noise and bandwidth, or a thermometer optimised for ultra-low temperature measurement, minimising the system noise temperature. By using a single temperature calibration point, we show that noise thermometers can be used for accurate measurements over a wide range of temperatures below 4 K. Comparisons with a melting curve thermometer, a calibrated germanium thermometer and a pulsed platinum nuclear magnetic resonance thermometer are presented. For the 1.290 resistance we measure a 1 % precision in just 100 ms, and have shown this to be independent of temperature.
Cite
@article{arxiv.1311.3265,
title = {Current Sensing Noise Thermometry: A fast practical solution to low temperature measurement},
author = {Andrew Casey and Frank Arnold and Lev V. Levitin and Chris P. Lusher and John Saunders and Aya Shibahara and Harriet van der Vliet and Dietmar Drung and Thomas Schurig and Graham Batey and Michael Cuthbert and Anthony Matthews},
journal= {arXiv preprint arXiv:1311.3265},
year = {2015}
}
Comments
12 pages, 8 figures, Paper submitted to the special edition of J.Low Temp.Phys. "Ultra-low temperatures and nanophysics - ULTN 2013"