Optimization and analysis of code-division multiplexed TES microcalorimeters

Published: January 20, 2012


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
Volume: 167
Issue: 5-6
Conference Dates: August 1-5, 2011
Conference Location: Heidelberg, -1
Conference Title: Low Temperature Detectors 14
Pub Type: Conferences


SQUID multiplexers, transition edge sensors
Created January 20, 2012, Updated November 10, 2018