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Superconducting Effects in Optimization of Magnetic Penetration Thermometers for X-ray Microcalorimeters
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Author and Affiliation:
Stevenson, Thomas R.(NASA Goddard Space Flight Center, Greenbelt, MD, United States);
Balvin, M. A.(NASA Goddard Space Flight Center, Greenbelt, MD, United States);
Denis, K. L.(NASA Goddard Space Flight Center, Greenbelt, MD, United States);
Hsieh, W.-T.(NASA Goddard Space Flight Center, Greenbelt, MD, United States);
Sadleir, J. E.(NASA Goddard Space Flight Center, Greenbelt, MD, United States);
Bandler, Simon E.(Maryland Univ., College Park, MD, United States);
Busch, Sarah E.(Oakridge Associated Universities, Oakridge, TN, United States);
Merrell, W.(Oakridge Associated Universities, Oakridge, TN, United States);
Kelly, Daniel P.(Muniz Engineering, Inc., Seabrook, MD, United States);
Nagler, Peter C.(Brown Univ., United States);
Porst, J.-P.(Brown Univ., United States);
Seidel, George E.(Brown Univ., United States);
Smith, Stephen J.(Maryland Univ. Baltimore County, Baltimore, MD, United States)
Abstract: We have made high resolution x-ray microcalorimeters using superconducting MoAu bilayers and Nb meander coils. The temperature sensor is a Magnetic Penetration Thermometer (MPT). Operation is similar to metallic magnetic calorimeters, but instead of the magnetic susceptibility of a paramagnetic alloy, we use the diamagnetic response of the superconducting MoAu to sense temperature changes in an x-ray absorber. Flux-temperature responsivtty can be large for small sensor heat capacity, with enough dynamic range for applications. We find models of observed flux-temperature curves require several effects to explain flux penetration or expulsion in the microscopic devices. The superconductor is non-local, with large coherence length and weak pinning of flux. At lowest temperatures, behavior is dominated by screening currents that vary as a result of the temperature dependence of the magnetic penetration depth, modified by the effect of the nonuniformity of the applied field occurring on a scale comparable to the coherence length. In the temperature regime where responslvity is greatest, spadal variations in the order parameter become important: both local variations as flux enters/leaves the film and an intermediate state is formed, and globally as changing stability of the electrical circuit creates a Meissner transition and flux is expelled/penetrates to minimize free energy.
Publication Date: Oct 08, 2012
Document ID:
20130013407
(Acquired May 13, 2013)
Subject Category: ELECTRONICS AND ELECTRICAL ENGINEERING
Report/Patent Number: GSFC.CP.7552.2013
Document Type: Conference Paper
Meeting Information: Applied Superconductivity Conference 2012; 8-12 Oct. 2012; Portland, OR; United States
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Description: 5p; In English; Original contains color illustrations
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Distribution as joint owner in the copyright
NASA Terms: CALORIMETERS; CIRCUITS; GOLD; INDUCTANCE; MAGNETIC PERMEABILITY; MATHEMATICAL MODELS; MEANDERS; MOLYBDENUM; OPTIMIZATION; PENETRATION; SQUID (DETECTORS); SUPERCONDUCTIVITY; SUPERCONDUCTORS (MATERIALS); TEMPERATURE SENSORS; THERMOMETERS; X RAYS
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