Sergatskov, D. A. and Day, P. K. and Babkin, A. V. and Nelson, R. C. and McCarson, T. D. and Boyd, S. T. P. and Duncan, R. V. (2003) New Paramagnetic Susceptibility Thermometers for Fundamental Physics Measurements. In: Temperature: its Measurement and Control in Science and Industry. AIP Conference Proceedings (684). American Institute of Physics , New York, pp. 1009-1013. ISBN 0-7354-0153-5 http://resolver.caltech.edu/CaltechAUTHORS:20111027-074510281
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New paramagnetic susceptibility thermometers have been developed for use in fundamental physics missions in earth orbit. These devices use a SQUID magnetometer to measure the variation in the dc magnetization of a thermometric element that consists of a dilute concentration of manganese in a palladium matrix. Near 2.2 K these new PdMn thermometers have demonstrated a temperature resolution of better than 100 pK/√Hz and a time constant of 50 ms when operated with a 50 K/W thermal resistance to the liquid helium sample. These thermometers have been observed to be remarkably stable, with a drift of less than 10 fK/s. The observed power spectral density of the noise from these thermometers is consistent with separate measurements of the device’s time constant and thermal standoff from the bath. Recently these PdMn materials have been made into thin films and microstructures for use in future studies of quantum liquids, and for possible use in a new class of bolometers and radiometers. These thermometers have been integrated into an experimental cell and thermal isolation network that are adequate to keep stray heats stable to within a few picowatts, with no systematic temperature errors greater than 60 pK, over the course of a planned fundamental physics experiment on Earth orbit.
|Item Type:||Book Section|
|Additional Information:||© 2003 American Institute of Physics. Issue Date: 29 September 2003. This work has been supported through the Fundamental Physics Discipline of the Microgravity Science Office of the United States National Aeronautics and Space Administration (NASA) under JPL Contract Number 960494. One of us (R.C.N.) acknowledges support from the United States Army.|
|Subject Keywords:||thermometers, magnetic susceptibility, SQUID magnetometers, manganese, palladium, paramagnetism|
|Classification Code:||PACS: 07.20.Dt|
|Official Citation:||New Paramagnetic Susceptibility Thermometers for Fundamental Physics Measurements D. A. Sergatskov, P. K. Day, A. V. Babkin, R. C. Nelson, T. D. McCarson, S. T. P. Boyd, and R. V. Duncan, AIP Conf. Proc. 684, 1009 (2003), DOI:10.1063/1.1627261|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||27 Oct 2011 15:09|
|Last Modified:||26 Dec 2012 14:20|
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