Mapping TES Temperature Sensitivity and Current Sensitivity as a Function of Temperature, Current, and Magnetic Field with IV Curve and Complex Admittance Measurements
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We have specialized astronomical applications for X-ray microcalorimeters with superconducting transition edge sensors (TESs) that require exceptionally good TES performance, but which operate in the small-signal regime. We have therefore begun a program to carefully characterize the entire transition surface of TESs with and without the usual zebra stripes to see if there are reproducible local “sweet spots” where the performance is much better than average. These measurements require precise knowledge of the circuit parameters. Here, we show how the Shapiro effect can be used to precisely calibrate the value of the shunt resistor. We are also investigating the effects of stress and external magnetic fields to better understand reproducibility problems.
KeywordsTES Complex impedance Temperature sensitivity Current sensitivity Weak-link effect Josephson junction Shapiro steps
This work has been supported by NASA Grant NNX16AM31G and the China Scholarship Council (Grant No. 201606210188).
- 10.J. Sadleir, Unexpected nonlinear effects in superconducting transition-edge sensors. in Applied Superconductivity Conference (ASC 2016), Denver. NASA technical report GSFC-E-DAA-TN34724 https://ntrs.nasa.gov/search.jsp?R=20160011113