Code-division multiplexing for x-ray microcalorimeters

Details Code-division multiplexing for x-ray microcalorimeters Code-division multiplexing for x-ray microcalorimeters

2012-01-30

arxiv.org/abs/1201.6289v1

Applied Physics Letters 100 (2012), 072601

Physics

Instrumentation and Detectors

To be published in Applied Physics Letters

Scientific paper

10.1063/1.3684807

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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