Physics – Optics
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21345114a&link_type=abstract
American Astronomical Society, AAS Meeting #213, #451.14; Bulletin of the American Astronomical Society, Vol. 41, p.346
Physics
Optics
Scientific paper
We would like to measure the microwave response of superconducting transition-edge (TES) detectors intended to measure polarization in the Cosmic Microwave Background (CMB). We have constructed a variable temperature (4-20K) load to simulate the blackbody radiation of the CMB as well as emission from optics, and the atmosphere and couple it efficiently to the detector. The load is a Nichrome plated quartz wafer inserted into a waveguide. The wafer is heated by applying Joule power to an attached resistor. We measured the temperature of the load using a Germanium resistance thermometer. In our study we measured the thermal time constant of the wafer (the time to reach equilibrium when there is a change in the power applied to the load), and the heat capacity and thermal conductance to a 4K bath. Our goals in construction were to minimize the size of the load, ensure that it is at least 90% emissive, and to optimize the thermal isolation of the load in order to minimize the amount of applied power while also obtaining a reasonable time constant. We discuss the design, construction and test results for this device. This work was supported by the National Science Foundation's REU program and the Department of Defense's ASSURE program through NSF Award AST-0453442.
Abdulla Zubair
Barrentine E.
Timbie Peter
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