Design and Performance of Hybrid Arrays of Mo/Au Bilayer Transition-Edge Sensors

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https://ieeexplore.ieee.org/abstract/document/7827054

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https://doi.org/10.1109/TASC.2017.2655718
 http://hdl.handle.net/11603/24014

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UMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
UMBC Faculty Collection
UMBC Physics Department

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Author/Creator ORCID

https://orcid.org/0000-0003-0622-5174
 https://orcid.org/0000-0002-9247-3010
 https://orcid.org/0000-0003-4096-4675
 https://orcid.org/0000-0001-8397-9338

Date

2017-01-19

Type of Work

journal articles
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Citation of Original Publication

W. Yoon et al., "Design and Performance of Hybrid Arrays of Mo/Au Bilayer Transition-Edge Sensors," in IEEE Transactions on Applied Superconductivity, vol. 27, no. 4, pp. 1-5, June 2017, Art no. 2100705, doi: 10.1109/TASC.2017.2655718.

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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract

For future X-ray astrophysics missions, X-ray microcalorimeters can be optimized with different properties in different regions of the focal plane. This approach has the potential to improve microcalorimeter instrument capabilities with efficient use of instrument resources. For example a point-source array optimized for high angular resolution, high count-rate observations could be accompanied by a main array to expand the field of view for diffuse observations. In this approach, it is desirable to be able to simultaneously optimize different transition-edge sensor (TES) geometries on a single wafer design. The key properties of TESs such as transition temperature and shape are a strong function of size and geometry due to the complex interplay between the proximity effect from the superconducting bias electrodes and the normal metal features used for noise suppression and absorber contact. As a result, devices fabricated with the same deposited layer but with different sizes will have different transition temperatures and different response to X-ray events. In this paper, we present measurements of the transition temperature and properties of devices with different sizes and normal metal features, and discuss how by tuning the geometry we can achieve the desired pixel parameters for a given application. We also describe measurements of transition properties from large-format hybrid arrays containing three different pixel types.