Computer Science – Performance
Scientific paper
Feb 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aipc..605..219l&link_type=abstract
LOW TEMPERATURE DETECTORS: Ninth International Workshop on Low Temperature Detectors. AIP Conference Proceedings, Volume 605, p
Computer Science
Performance
11
Superconducting Optical, X-Ray, And Gamma-Ray Detectors, X- And Gamma-Ray Telescopes And Instrumentation
Scientific paper
We are optimizing Mo/Au transition-edge-sensor (TES) calorimeters to meet the specifications of NASA's Constellation-X mission. Our calorimeters have already demonstrated very good energy resolution of X rays (2.4 eV at 1.5 keV). We wish to further improve the energy resolution by reducing excess noise in the calorimeters. Development of a detailed model and understanding of the noise is instrumental to reaching this goal. Towards that end, we employ a linear model that describes the response of a calorimeter to signal and various sources of noise. The model is based on detailed measurements of the parameters that affect the calorimeter's performance, such as current-voltage characteristics of the TES, thermal conductance of our silicon-nitride membranes, and inductance in the electronic circuit used to bias the TES. We determine the sharpness of the superconducting phase transition by fitting the model to the measured responsivity of the calorimeter. The model relates sources of noise, such as phonon noise, Johnson noise, and hypothetical sources of excess noise, to measurements of noise in the TES. Based on this analysis, we find that the excess noise is consistent with frequency-independent voltage noise in the TES .
Brekosky Regis P.
Figueroa-Feliciano Enectali
Finkbeiner Fred M.
Li Mary
Lindeman Mark A.
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