Statistics – Applications
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.9809c&link_type=abstract
American Astronomical Society, AAS Meeting #211, #98.09; Bulletin of the American Astronomical Society, Vol. 39, p.910
Statistics
Applications
Scientific paper
Transition edge sensors (TESs) are in development for use as X-ray microcalorimeters as in the Constellation-X mission and as bolometers in other instruments such as FIBRE. TESs are thin films biased in the superconducting phase transition. In these applications, TESs are suspended on thin silicon nitride membranes. In previous measurements, researchers have typically used measurements of TES in the middle of phase transition to find the conductance of the membranes, which is an important parameter in the design of these devices. However, it is difficult to accurately isolate the conductance from this data. We are developing a new technique to accurately measure the thermal coupling of the membranes using the TES. We measure a series of current vs. voltage (I-V) characteristics of a TES over a wide range of temperatures. Data from temperatures above the transition temperature are used to measure the thermal conductance and how it scales with temperature. The exponent β was found be 1.5 +/- 0.5. in one measurement and 2.06 +/- 0.05 in another measurement. An exponent of 2 corresponds to a 2-D phonon gas in the membrane. Accurate measurements of the thermal coupling using this method have also made it possible to characterize the superconducting phase transition of a TES more completely than has been done before. These measurements provide a clearer picture of the operation and response of these devices and aid in the design and optimization of TESs for various applications.
This work was supported by the REU and ASSURE programs through NSF award
AST-0453442.
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