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|Author(s):||Joel N. Ullom; M. Cunningham; T. Miyazaki; S. E. Lebov;|
|Title:||A frequency-domain read-out technique suitable for large microcalorimeter arrays demonstrated using high-resolution cryogenic gamma-ray sensors|
|Published:||June 01, 2003|
|Abstract:||Cryogenic sensors composed of transition-biased superconducting films have demonstrated remarkable sensitivity at gamma-ray, x-ray, optical, and submillimeter wavelengths. However, for these sensors to find widespread application in astronomy and materials analysis, technologies for building and reading-out large arrays are required. We are currently developing a frequency-domain multiplexing scheme for the read-out of large numbers of microcalorimeters using a much smaller number of amplifiers. In this scheme, each sensor is biased at an identifying frequency and operated in a series LC circuit to suppress out-of-band noise. Here, we present results demonstrating the undegraded operation of two gamma-ray sensors multiplexed using this technique. In addition, we provide a series of design rules which relate the minimum bias frequency and the values of the reactive elements in the system to a small number of sensor properties. Finally, we discuss the ultimate limits on the number of sensors that can be measured with a single amplifier.|
|Citation:||IEEE Transactions on Applied Superconductivity|
|Pages:||pp. 643 - 648|