Optimization and analysis of code-division multiplexed TES microcalorimeters
J. W. Fowler, W. B. Doriese, G. C. Hilton, K. D. Irwin, D. R. Schmidt,, G. M. Stiehl, D. S. Swetz, J. N. Ullom, and L. R. Vale. (NIST Boulder, Laboratories, Boulder, Colorado, USA)
TL;DR
This paper presents the development and analysis of a code-division multiplexing system for TES microcalorimeters, achieving high energy resolution and addressing data analysis challenges for large-scale sensor arrays.
Contribution
It introduces an empirical method for demodulation matrix optimization and demonstrates high-resolution x-ray measurements with a four-channel prototype.
Findings
Achieved energy resolutions of 2.3 to 3.0 eV at 5.9 keV
Developed a method to minimize cross-talk in demodulation
Demonstrated feasibility of high multiplexing factors
Abstract
We are developing code-division multiplexing (CDM) systems for transition-edge sensor arrays with the goal of reaching multiplexing factors in the hundreds. We report on x-ray measurements made with a four-channel prototype CDM system that employs a flux-summing architecture, emphasizing data-analysis issues. We describe an empirical method to determine the demodulation matrix that minimizes cross-talk. This CDM system achieves energy resolutions of between 2.3 eV and 3.0 eV FWHM at 5.9 keV.
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