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Time-division multiplexing of high-resolution x-ray microcalorimeters: Four pixels and beyond

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11 Author(s)
Doriese, W.B. ; National Institute of Standards and Technology, 325 Broadway, MC 817.03, Boulder, Colorado 80305 ; Beall, J.A. ; Deiker, S. ; Duncan, W.D.
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We present experimental results from a four-pixel array of transition-edge-sensor, x-ray microcalorimeters read out through a single amplifier channel via a time-division superconducting quantum interference device multiplexer. We map the dependence of the x-ray energy resolution of the microcalorimeters on multiplexer timing parameters. We achieve multiplexed, four-pixel resolution of 6.94±0.05 eV full width at half maximum of the Mn  complex near 5.9 keV, which is a degradation of only 0.44 eV from nonmultiplexed operation. An analysis of straightforward upgrades to the multiplexer predicts that a linear array of 32 of these pixels could be multiplexed with a degradation in resolution of only 0.1 eV. These results, the first demonstration of a time-division multiplexer for x-ray detectors, establish a clear path to the instrumentation of a kilopixel microcalorimeter array.

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Applied Physics Letters  (Volume:85 ,  Issue: 20 )