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Absorber Materials for Transition-Edge Sensor X-ray MicrocalorimetersArrays of superconducting transition-edge sensors (TES) can provide high spatial and energy resolution necessary for x-ray astronomy. High quantum efficiency and uniformity of response can be achieved with a suitable absorber material, in which absorber x-ray stopping power, heat capacity, and thermal conductivity are relevant parameters. Here we compare these parameters for bismuth and gold. We have fabricated electroplated gold, electroplated gold/electroplated bismuth, and evaporated gold/evaporated bismuth 8x8 absorber arrays and find that a correlation exists between the residual resistance ratio (RRR) and thin film microstructure. This finding indicates that we can tailor absorber material conductivity via microstructure alteration, so as to permit absorber thermalization on timescales suitable for high energy resolution x-ray microcalorimetry. We show that by incorporating absorbers possessing large grain size, including electroplated gold and electroplated gold/electroplated bismuth, into our current Mo/Au TES, devices with tunable heat capacity and energy resolution of 2.3 eV (gold) and 2.1 eV (gold/bismuth) FWHM at 6 keV have been fabricated.
Document ID
20070036732
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Brown, Ari-David (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Bandler, Simon (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Brekosky, Regis (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Chervenak, James (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Figueroa-Feliciano, Enectali (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Finkbeiner, Fred (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Sadleir, Jack (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Iyomoto, Naoko (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kelley, Richard (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kilbourne, Caroline (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Porter, F. Scott (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Smith, Stephen (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Saab, Tarek (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Sadleir, Jac, (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 24, 2013
Publication Date
January 1, 2007
Subject Category
Astronomy
Meeting Information
Meeting: 12th International Workshop on Low Temperature Detectors
Location: Paris
Country: France
Start Date: July 22, 2007
End Date: July 27, 2007
Sponsors: Conservatoire National des Arts et Metiers
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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