Optimization of the TES-bias circuit for a multiplexed microcalorimeter array

Published

January 27, 2012

Author(s)

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

Abstract

In the detector-bias circuit of a transition-edge-sensor (TES) microcalorimeter, the TES-shunt resistor (Rsh) and the thermal conductance to the cryogenic bath (G) are often considered to be interchangeable knobs with which to control detector speed. Indeed, for otherwise-identical TES-parameter models, there are many combinations of Rsh and G that give the same decay-time constants and similar energy resolutions. We present a set of calculations that, given a linear TES model and count-rate and energy-resolution requirements, selects the optimal values of Rsh and G and also determines the required combinations of SQUID-readout noise, multiplexer row-period, and multiplexer row-count to read out the array. We find that low-G, low-Rsh models make multiplexed readout easier. Recent improvements in the NIST time-division-multiplexing architecture have allowed a NIST eight-pixel TES array to be read out with 2.70 eV (full-width at half-maximum) average energy resolution at 6 keV. Finally, we show that the X-rayMicrocalorimeter Spectrometer co-proposed by NASA and NIST for ESA’s Athena X-ray observatory is straightforwardly achievable, including engineering margin, with present NIST readout parameters.

Citation

Journal of Low Temperature Physics

Volume

167

Issue

5

Pub Type

Journals

Download Paper

https://doi.org/10.1007/s10909-012-0509-7

Keywords

transition-edge sensor, SQUID multiplexer, X-ray microcalorimeter

Citation

Doriese, W. , Alpert, B. , Fowler, J. , Hilton, G. , Hojem, A. , Irwin, K. , Reintsema, C. , Schmidt, D. , Stiehl, G. , Swetz, D. , Ullom, J. and Vale, L. (2012), Optimization of the TES-bias circuit for a multiplexed microcalorimeter array, Journal of Low Temperature Physics, [online], https://doi.org/10.1007/s10909-012-0509-7 (Accessed November 21, 2024)