Demonstration of code-division multiplexing for x-ray microcalorimeters

Published: February 13, 2012


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


We demonstrate the code-division multiplexing (CDM) readout of eight transition-edge sensor microcalorimeters. The energy resolution is 3.0 eV (full width at half-maximum) or better at 5.9 keV, with a best resolution of 2.3 eV and a mean of 2.6 eV over the seven modulated detectors. The flux- summing CDM system is described and compared with similar time-division multiplexing (TDM) readout. We show that the √Npixels multiplexing disadvantage associated with TDM is not present in CDM. This demonstration establishes CDM as both a simple route to higher performance in existing TDM microcalorimetric experiments and a long-term approach to reaching higher multiplexing factors.
Citation: Applied Physics Letters
Volume: 100
Issue: 7
Pub Type: Journals


SQUID multiplexers, transition-edge sensors
Created February 13, 2012, Updated November 10, 2018