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Thermal Transport Model for Heat Sink DesignA document discusses the development of a finite element model for describing thermal transport through microcalorimeter arrays in order to assist in heat-sinking design. A fabricated multi-absorber transition edge sensor (PoST) was designed in order to reduce device wiring density by a factor of four. The finite element model consists of breaking the microcalorimeter array into separate elements, including the transition edge sensor (TES) and the silicon substrate on which the sensor is deposited. Each element is then broken up into subelements, whose surface area subtends 10 10 microns. The heat capacity per unit temperature, thermal conductance, and thermal diffusivity of each subelement are the model inputs, as are the temperatures of each subelement. Numerical integration using the Finite in Time Centered in Space algorithm of the thermal diffusion equation is then performed in order to obtain a temporal evolution of the subelement temperature. Thermal transport across interfaces is modeled using a thermal boundary resistance obtained using the acoustic mismatch model. The document concludes with a discussion of the PoST fabrication. PoSTs are novel because they enable incident x-ray position sensitivity with good energy resolution and low wiring density.
Document ID
20090041754
Acquisition Source
Goddard Space Flight Center
Document Type
Other - NASA Tech Brief
Authors
Chervenak, James A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kelley, Richard L.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Brown, Ari D.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Smith, Stephen J.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kilbourne, Caroline a.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 24, 2013
Publication Date
December 1, 2009
Publication Information
Publication: NASA Tech Briefs, December 2009
Subject Category
Man/System Technology And Life Support
Report/Patent Number
GSC-15671-1
Distribution Limits
Public
Copyright
Public Use Permitted.
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