Thermal Crosstalk of X-Ray Transition-Edge Sensor Micro-Calorimeters under Frequency Domain Multiplexing Readout

Journal article (2022)

Authors

D. Vaccaro SRON Netherlands Institute for Space Research
Hiroki Akamatsu SRON Netherlands Institute for Space Research
Marcel Bruijn SRON Netherlands Institute for Space Research
L Gottardi SRON Netherlands Institute for Space Research
Roland Den Hartog SRON Netherlands Institute for Space Research
Jan Van Der Kuur SRON Netherlands Institute for Space Research
Marcel Ridder SRON Netherlands Institute for Space Research
Martin de Wit SRON Netherlands Institute for Space Research
J.R. Gao SRON Netherlands Institute for Space Research, ImPhys/Optics - AS
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Research Group
ImPhys/Optics (AS) (TU Delft)
Copyright: © 2022 Davide Vaccaro, Hiroki Akamatsu, Marcel Bruijn, Luciano Gottardi, Roland Den Hartog, Jan Van Der Kuur, Marcel Ridder, Martin De Wit, J.R. Gao, More Authors
DOI
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https://doi.org/10.1109/TASC.2021.3128710
Monte carlo Detector energy resolution Frequency domain multiplexing Space-borne satellites Thermal crosstalk Transition-edge sensors X-ray astronomy X-ray micro-calorimeters
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Published Date

2022

Language

English

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Faculty

Applied Sciences

Department

ImPhys/Imaging Physics

Research Group

ImPhys/Optics

Abstract

We have measured and characterized the thermal crosstalk in two different arrays of transition-edge sensor (TES) X-ray microcalorimeters with frequency-domain multiplexing (FDM) readout. The TES arrays are fabricated at SRON and are a 8 × 8 and a 32 × 32 'kilo-pixel' uniform array. The amount of crosstalk is evaluated as the ratio between the averaged crosstalk signal and the X-ray pulse amplitudes. The crosstalk ratios (CRs) for our detectors are compliant with the requirements for future X-ray space missions, such as Athena X-IFU (CR < 10^{-3 for first-neighbor pixels): We measured a nearest neighbor thermal CR at a level of 10^{-4, with a highest CR of 4× 10^{-4 for the kilo-pixel array (worst case, center of array) and 1× 10^{-4 for the 8 × 8 array, with a margin of improvement achievable by optimizing the Cu metallization and the width of the Si supporting structures (muntins) in the backside of the TES array chip. Based on the measured CRs, we have estimated the impact on the spectral resolution by means of noise equivalent power considerations and a Monte Carlo simulation, finding an average degradation in quadrature of less than 40 meV, compliant with the <0.2 eV requirement for Athena X-IFU.