Development of a Superconducting Heat Switch for an Ideal Integrating Bolometer
DOI :
https://doi.org/10.17307/wsc.v1i1.181Mots-clés :
Cryogenics, Superconductivity, LabVIEW, Sub-Kelvin RefrigerationRésumé
Improving the sensitivity of current state-of-the-art bolometers is essential for future cosmology endeavors. Having a bolometer that is thermally isolated from its thermal sink is ideal in order to reduce phonon noise: the factor limiting bolometer sensitivity. To thermally isolate a bolometer as much as possible a pixel-scale superconducting heat switch is being developed to control the conductance between a bolometer and its thermal sink. The heat switch is comprised of a superconducting thin aluminum film surrounded by a niobium coil. Current is passed through the coil and the resulting magnetic field drives the aluminum into its high conductance normal state. Experimental data agrees well with the results of a thermal model of the device. Â
Références
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