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Small Pitch Transition-Edge Sensors with Broadband High Spectral Resolution for Solar PhysicsWe are developing small pitch transition-edge sensor (TES) X-ray detectors optimized for solar astronomy. These devices are fabricated on thick Si substrates with embedded Cu heat-sink layer. We use 35 x 35 square micrometers Mo/Au TESs with 4.5 micrometer thick Au absorbers. We have tested devices with different geometric absorber stem contact areas with the TES and surrounding substrate area. This allows us to investigate the loss of athermal phonons to the substrate. Results show a correlation between thc stem contact area and a broadening in the spectral line shape indicative of athermal phonon loss. When the contact area is minimized we have obtained exceptional broadband spectral resolution of 1.28 plus or minus 0.03 eV at an energy of 1.5 keV, 1.58 plus or minus 0.07 eV at 5.9 keV and 1.96 plus or minus 0.08 eV at 8 keV. The linearity in the measured gain scale is understood in the context of the longitudinal proximity effect from the electrical bias leads resulting in transition characteristics that are strongly dependent upon TES size.
Document ID
20120015514
Document Type
Reprint (Version printed in journal)
Authors
Smith, S. J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Adams, J. S. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Eckart, M. E. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Smith, Adams (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Bailey, C. N. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Bandler, S. R. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Chevenak, J. A. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Finkbeiner, F. M. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kelley, R. L. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kilbourne, C. A. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Porter, F. S. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Sadleir, J. E. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 26, 2013
Publication Date
February 1, 2012
Publication Information
Publication: Journal of Low Temperature Physics
Volume: 167
Issue: 4-Mar
Subject Category
Solar Physics
Report/Patent Number
GSFC.JA.7033.2012
Distribution Limits
Public
Copyright
Other