1. Toward Large Field-Of-View High-Resolution X-Ray Imaging Spectrometers: Microwave Multiplexed Readout of 28 TES Microcalorimeters
- Author
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Yoon, W, Adams, J. S, Bandler, S. R, Becker, D, Bennett, D. A, Chervenak, J. A, Datesman, A. M, Eckart, M. E, Finkbeiner, F. M, Fowler, J. W, Gard, J. D, Hilton, G. D, Kelley, R. L, Kilbourne, C. A, Mates, J. A. B, Miniussi, A. R, Moseley, S. H, Noroozian, O, Porter, F. S, Reintsema, C. D, Sadleir, J. E, Sakai, K, Smith, S. J, Stevenson, T. R, Swetz, D. S, Ullom, J. N, Vale, L. R, Wakeham, N. A, Wassell, E. J, and Wollack, E. J
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Astrophysics - Abstract
We performed small-scale demonstrations at GSFC of high-resolution Xray TES microcalorimeters read out using a microwave SQUID multiplexer. This work is part of our effort to develop detector and readout technologies for future space-based X-ray instruments such as the microcalorimeter spectrometer envisaged for Lynx, a large mission concept under development for the Astro 2020 Decadal Survey. In this paper we describe our experiment, including details of a recently designed, microwave-optimized low-temperature setup that is thermally anchored to the 55mKstage of our laboratory ADR. Using aROACH2 FPGA at room temperature, we read out pixels of a GSFC-built detector array via a NIST-built multiplexer chip with Nb coplanar waveguide resonators coupled to rf-SQUIDs. The resonators are spaced 6 MHz apart (at ∼ 5.9 GHz) and have quality factors of ∼ 15,000. In our initial demonstration, we used flux-ramp modulation frequencies of 125 kHz to read out 5 pixels simultaneously and achieved spectral resolutions of 2.8-3.1 eV FWHM at 5.9 keV. Our subsequent work is ongoing: to-date we have achieved a median spectral resolution of 3.4 eV FWHM at 5.9 keV while reading out 28 pixels simultaneously with flux-ramp frequencies of 160 kHz. We present the measured system-level noise and maximum slew rates and briefly describe our future development work.
- Published
- 2018
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