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Code-division multiplexing for x-ray microcalorimeters

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arxiv 1201.6289 v1 pith:4TBQCG33 submitted 2012-01-30 physics.ins-det astro-ph.IM

Code-division multiplexing for x-ray microcalorimeters

G. M. Stiehl , W. B. Doriese , J. W. Fowler , G. C. Hilton , K. D. Irwin , C. D. Reintsema , D. R. Schmidt , D. S. Swetz
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J. N. Ullom L. R. Vale. (US National Institute of Standards Technology)
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classification physics.ins-det astro-ph.IM
keywords multiplexingcode-divisionhighermicrocalorimetersmultiplexedreadoutresolutionapproach
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We demonstrate the code-division multiplexed (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 multiplexed (TDM) readout. We show that the sqrt(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.

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