High-Frequency Noise Peaks in Mo/Au Superconducting Transition-Edge Sensor Microcalorimeters
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High‑Frequency Noise Peaks in Mo/Au Superconducting Transition‑Edge Sensor Microcalorimeters N. A. Wakeham1,2 · J. S. Adams1,2 · S. R. Bandler1 · S. Beaumont1,2 · M. P. Chang1,3 · J. A. Chervenak1 · A. M. Datesman1,3 · M. E. Eckart4 · F. M. Finkbeiner1,5 · J. Y. Ha1,6 · R. Hummatov1,2 · R. L. Kelley1 · C. A. Kilbourne1 · A. R. Miniussi1,2 · F. S. Porter1 · J. E. Sadleir1 · K. Sakai1,2 · S. J. Smith1,2 · E. J. Wassell1,3 Received: 17 July 2019 / Accepted: 26 December 2019 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The measured noise in Mo/Au transition-edge sensor (TES) microcalorimeters produced at NASA has recently been shown to be well described by a two-body electrothermal model with a finite thermal conductance between the X-ray absorber and the TES. In this article, we present observations of a high-frequency peak in the measured current noise in some of these devices. The peak is associated with an oscillatory component of the TES response that is not predicted in a single-body model but can be qualitatively described by the two-body model. Keywords Transition-edge sensor · Microcalorimeter · Multi-body
1 Introduction Superconducting transition-edge sensor (TES) microcalorimeters produced at NASA’s Goddard Space Flight Center are the baselined technology for the X-ray Integral Field Unit instrument on the Advanced Telescope for High-ENergy Astrophysics (ATHENA) [1]. These microcalorimeters must be capable of simultaneously achieving all the challenging performance requirements of the instrument, such as * N. A. Wakeham [email protected] 1
NASA Goddard Space Flight Center (GSFC), Greenbelt, MD 20771, USA
2
CRESST II – University of Maryland, Baltimore County, MD 21250, USA
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Science Systems and Applications, Inc. (SSAI), 10210 Greenbelt Rd, Lanham, MD 20706, USA
4
Lawrence Livermore National Laboratory (LLNL), Livermore, CA 94550, USA
5
Sigma Space Corp., 4600 Forbes Blvd., Lanham, MD 20706, USA
6
SB Microsystems, 806 Cromwell Park Dr, Glen Burnie, MD 21061, USA
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Vol.:(0123456789)
Journal of Low Temperature Physics
energy resolution, energy range and X-ray count rate. In order to do this, it is important to have extremely close control and knowledge of all the intrinsic properties of these devices. In the simplest model of a TES microcalorimeter, the noise sources can be calculated by treating the TES as a normal resistor, and the thermal model of the device as a single thermal body connected to a heat bath by a single thermal conductance term [2–4]. A long standing problem with superconducting TES devices has been the measurement of noise in excess of the predictions from this simple model [4–6]. Many experimental and theoretical works have presented explanations for this socalled excess noise by adding additional complexity to the treatment of either the TES electrical behavior or the thermal model of the microcalorimeter [7–10]. Recent work by our group presented evidence that, despite the excellent energy resolution they can achieve,
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