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Journal of Low Temperature Physics

Implications of Weak Link Effects on Thermal Characteristics of Transition-Edge Sensors

Catherine N. Bailey, J. S. Adams, S. R. Bandler, Regis P. Brekosky, James A. Chervenak, Megan E. Eckart, Fred Michael Finkbeiner, Richard L. Kelley, D. P. Kelly, Caroline Anne Kilbourne, Frederick Scott Porter, J. E. Sadleir, S. J. Smith

Published Feb 9, 2012• 10 citations
Publisher
DOI
10.1007/s10909-012-0562-2

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It has been recently demonstrated that superconducting transition edge-sensors behave as weak-links due to longitudinally induced superconductivity from the leads with higher Tc. In this work we study the implication of this behaviour for transition-edge sensors (TES)-based bolometers and microcalorimeter under ac bias. The TESs are read-out at frequencies between 1 and 5 MHz by a frequency domain multiplexer based on a linearised two-stage SQUID amplifier and high-Q lithographically made superconducting LC resonators. In particular, we focus on SRON TiAu TES bolometers with a measured dark noise equivalent power of 3.2 \\times 10 -19 W/\\sqrt{Hz} developed for the short wavelength band for the instrument SAFARI on the SPICA telescope.