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Optimization and analysis of code-division multiplexed TES microcalorimeters



Joseph W. Fowler, William B. Doriese, Gene C. Hilton, Kent D. Irwin, Daniel R. Schmidt, Greg Stiehl, Daniel S. Swetz, Joel N. Ullom, Leila R. Vale


We are developing code-division multiplexing (CDM) readout systems for TES arrays for good scalability to large multiplexing factors. We report high energy resolution x-ray measurements made through four-channel CDM that employ a flux-summing architecture, emphasizing data analysis issues. We describe an empirical method to determine the demodulation matrix to minimize cross-talk. All resolutions are estimated with a full maximum-likelihood fit to energy histogram,avoiding the bias towards good resolution that arises in simpler chi-squared fits. The present CDM system has achieved energy resolutions of between 2.3 and 3.0 eV FWHM at 6 keV.
Proceedings Title
Journal of Low Temperature Physics
Conference Dates
August 1-5, 2011
Conference Location
Conference Title
Low Temperature Detectors 14


SQUID multiplexers, transition edge sensors


Fowler, J. , Doriese, W. , Hilton, G. , Irwin, K. , Schmidt, D. , Stiehl, G. , Swetz, D. , Ullom, J. and Vale, L. (2012), Optimization and analysis of code-division multiplexed TES microcalorimeters, Journal of Low Temperature Physics, Heidelberg, -1, [online], (Accessed July 22, 2024)


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Created January 20, 2012, Updated November 10, 2018