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Design of High Resolution Soft X-Ray Microcalorimeters Using Magnetic Penetration ThermometersWe have designed high-resolution soft x-ray microcalorimeters using magnetic penetration thermometers (MPTs) in an array of pixels covering a total of 2 square centimeters to have a resolving power of 300 at energies around 300 eV. This performance is desirable for studying the soft x-ray background from the warm hot intergalactic medium. MPT devices have small sensor heat capacity and high responsivities, which makes them excellent detector technology for attempting to attain sub-eV resolution. We are investigating the feasibility of pixels with absorbers that are 625 x 625 square micrometers, up to 1 x 1 square millimeters in area and 0.35 micrometer thick and thinner. Our tests have shown that suspended gold absorbers 0.35 micrometers thick (RRR = 6.7) are feasible to fabricate. We modeled the thermal diffusion from such thin gold over the size of a 625 x 625 square micrometer absorber, and conclude that the effect of the thermalization on the resolution of a 300 eV photon is an additional approximately 0.2 eV FWHM of broadening. We discuss the thermal effects of small absorber attachment sterns on solid substrate, as well as considerations for multiplexed readout. We will present the progress we have made towards building and testing this soft x-ray detector.
Document ID
20120012888
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Busch. Sarah (Maryland Univ. Baltimore County Catonsville, MD, United States)
Balvin, Manuel (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Bandler, Simon (Maryland Univ. College Park, MD, United States)
Denis, Kevin (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Finkbeiner, Fred
Porst, Jan-Patrick (Maryland Univ. College Park, MD, United States)
Sadlier, Jack
Smith, Stephen
Stevenson, Thomas (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 26, 2013
Publication Date
January 1, 2012
Subject Category
Instrumentation And Photography
Report/Patent Number
GSFC.ABS.6344.2012
Meeting Information
Meeting: Applied Superconductivity Conference
Location: Portland, OR
Country: United States
Start Date: October 7, 2012
End Date: October 11, 2012
Sponsors: Institute of Electrical and Electronics Engineers
Funding Number(s)
CONTRACT_GRANT: NNH06CC03B
Distribution Limits
Public
Copyright
Public Use Permitted.

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