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Performance and Characterization of Magnetic Penetration Thermometer Devices for X-Ray SpectroscopyWe are developing magnetic penetration thermometers (MPTs) for applications in X-ray astronomy. These non-dissipative devices consist of an X-ray absorber in good thermal contact to a superconducting thin film with a transition temperature around T=100mK. A microfabricated superconducting planar inductor underneath is used to store a persistent current and couple the superconductor's diamagnetic response to a readout SQUID. The strong temperature dependence of the diamagnetic response make these devices suitable for highly sensitive macroscopic thermometers that are capable of achieving very high energy resolution. We present results achieved with MPTs consisting of MoAu bilayer sensors attached to overhanging square 250 micron by 250 micron gold absorbers that have demonstrated an energy resolution of delta E_FWHM=2.3eV at an X-ray energy of 5.9keV. A similar device has shown delta E_FWHM=2.0eV at 1.5 keV. Under certain conditions and for specific device geometries, the temperature responsivity of the MPTs can vary on long timescales degrading the spectral performance. We present the characterization of different inductor geometries to optimize the design for the highest possible temperature sensitivity and compare different device designs with respect to responsivity stability.
Document ID
20120011826
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Porst, J. -P. (Maryland Univ. College Park, MD, United States)
Adams, J. S.
Bandler, S. R. (Maryland Univ. College Park, MD, United States)
Balvin, M. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Busch, S. E. (Oak Ridge Associated Universities, Inc. Washington, DC, United States)
Denis, K. L. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kelly, D.
Nagler, P. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Sadleir, J. E. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Seidel, G. M.
Smith, S.
Stevenson, T. R. (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.01125.2012
Funding Number(s)
CONTRACT_GRANT: NNG06E090A
Distribution Limits
Public
Copyright
Public Use Permitted.

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