Demonstration of Fine-Pitch High-Resolution X-ray Transition-Edge Sensor Microcalorimeters Optimized for Energies below 1 keV

Autor: R. L. Kelley, Megan E. Eckart, Stephen J. Smith, Joseph S. Adams, Aaron M. Datesman, John E. Sadleir, F. M. Finkbeiner, Edward J. Wassell, D. McCammon, N. A. Wakeham, Simon R. Bandler, Caroline A. Kilbourne, A. R. Miniussi, Felix Jaeckel, Kazuhiro Sakai, F. S. Porter, Jay Chervenak, Kevin Ryu, S. Beaumont
Rok vydání: 2020
Předmět:
Zdroj: Journal of Low Temperature Physics. 199:949-954
ISSN: 1573-7357
0022-2291
Popis: In this paper, we report on X-ray transition-edge sensor (TES) microcalorimeters optimized to have the best possible energy resolution for a limited energy range for the incoming X-rays, such as an energy resolution of 0.3 eV full width half maximum (FWHM) for energies up to $$\approx 0.8\,{\mathrm{keV}}$$ as is desirable for one of the Lynx X-ray Microcalorimeter subarrays. The test array we have fabricated has $$60\times 60$$ sensors on a pitch of $$50\,\upmu {\mathrm{m}}$$, and has $$46\times 46\,\upmu {\mathrm{m}}^2$$ absorbers that are one micrometer thick. We have measured a spectral energy resolution of the same device using 3 eV photons delivered through an optical fiber. For the one-photon 3 eV line, we have obtained an energy resolution of 0.25 eV FWHM, which is consistent with the estimated performance based on the signal size and noise. Further measurements will determine how the energy resolution degrades with energy. Based upon measurements of the TES transition characteristics, it appears that this level of energy resolution should be achievable up to 0.5 keV, and the performance will then gradually degrade to the measured energy resolution of around 2.3 eV at 1.5 keV. In this paper, we describe the full design and characterization of this detector, and discuss the performance limits of pixels designs like this.
Databáze: OpenAIRE
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