Dr. Kenichiro Nagayoshi Profile

Dr. Kenichiro Nagayoshi

at SRON Netherlands Institute for Space Research

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Author

Publications (7)

Proceedings Article | 31 August 2022 Presentation + Paper

Performance of the SRON Ti/Au transition edge sensor x-ray calorimeters

Martin de Wit, Luciano Gottardi, Kenichiro Nagayoshi, Hiroki Akamatsu, Marcel Bruijn, Marcel Ridder, Emanuele Taralli, Davide Vaccaro, Jian-Rong Gao, Jan-Willem den Herder

Proceedings Volume 12181, 121812B (2022) https://doi.org/10.1117/12.2629368

KEYWORDS: Sensors, Resistance, X-rays, Magnetism, Fused deposition modeling, Temperature metrology, Superconductors, Multiplexing, X-ray imaging, Lead

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Proceedings Article | 13 December 2020 Poster

Optimizing normal resistance of an x-ray transition edge sensor for frequency domain multiplexing

Kenichiro Nagayoshi, Martin de Wit, Luciano Gottardi, Marcel Ridder, Sven Visser, Emanuele Taralli, Hiroki Akamatsu, Marcel Bruijn, Jian-Rong Gao, Ruud W. Hoogeveen, Jan-Willem den Herder

Proceedings Volume 11444, 114444C (2020) https://doi.org/10.1117/12.2562782

KEYWORDS: X-rays, Sensors, Space observatories, Superconductors, X-ray imaging, Spectral resolution, Fused deposition modeling, Resistance, Space telescopes, Spectroscopy

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Athena is an ESA-led space telescope to be launched in the early 2030s. The X-ray Integral Field Unit (X-IFU) on board of the Athena mission is an X-ray imaging spectrometer, sensitive to 0.2-12 keV X-rays. The main sensor of the X-IFU is an array of ~3200 closely-packed superconducting transition-edge sensor (TES) microcalorimeters with X-ray absorbers. The X-IFU provides a breakthrough spectral resolution of 2.5 eV (full width at half maximum; FWHM) at 6 keV, which enables us to access unrevealed properties of the hot gases that are formed at every level of the hierarchical structure of the universe. At SRON, we are developing Frequency Division Multiplexing (FDM) readout with SQUID amplifiers as a baseline technology for the X-IFU. In the FDM system, the microcalorimeter pixels are AC-biased at different frequencies from 1 to 5 MHz. Therefore, it is crucial to minimize frequency-dependent phenomena because it causes non-linearity effects in the detector response and degrades the spectral resolution. Theoretical analyses have shown that this non-linearity is caused by weak-link behavior, induced by superconducting leads and can be mitigated by increasing the normal resistance of the TES. We are also developing TES arrays based on a superconducting Ti/Au bi-layer with an Au absorber as a sensor backup technology for the X-IFU. We have recently fabricated TES calorimeters with large variation of normal resistance from 25 to 150 mΩ by changing the width and aspect ratio of the bi-layer. The TESes with 117 and 150 mΩ have shown a promising spectral performance of below 2 eV (FWHM) at 6 keV. However, we still see that the detector response is affected by the weak-link behavior, especially at high frequency regime. In this paper, we briefly summarize our results with a focus on the spectral performance and the detector responsivity for each TES design. We also present our recent works on fabrication related to a superconducting wiring process, which would be useful for further reduction of the weak-link effects.

Proceedings Article | 13 December 2020 Poster + Paper

Developing x-ray microcalorimeters based on TiAu TES for HUBS

G. Wang, M. Bruijn, K. Nagayoshi, M. Ridder, E. Taralli, L. Gottardi, H. Akamatsu, J. W. den Herder, J.-R. Gao, W. Cui

Proceedings Volume 11444, 114449J (2020) https://doi.org/10.1117/12.2562100

KEYWORDS: X-rays, Spatial resolution, X-ray optics, Metals, Space operations, Spectroscopy, Sensors, Metalloids, Absorption, Resistance

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Proceedings Article | 13 December 2020 Paper

HUBS: a dedicated hot circumgalactic medium explorer

W. Cui, J. Bregman, M. Bruijn, L.-B. Chen, Y. Chen, C. Cui, T.-T. Fang, B. Gao, H. Gao, J.-R. Gao, L. Gottardi, K.-X. Gu, F.-L. Guo, J. Guo, C.-L. He, P.-F. He, J.-W. den Herder, Q.-S. Huang, F.-J. Li, J.-T. Li, J.-J. Li, L.-Y. Li, T.-P. Li, W.-B. Li, J.-T. Liang, Y.-J. Liang, G.-Y. Liang, Y.-J. Liu, Z. Liu, Z.-Y. Liu, F. Jaeckel, L. Ji, W. Ji, H. Jin, X. Kang, Y.-X. Ma, D. McCammon, H.-J. Mo, K. Nagayoshi, K. Nelms, R. Qi, J. Quan, M. Ridder, Z.-X. Shen, A. Simionescu, E. Taralli, Q. Wang, G.-L. Wang, J.-J. Wang, K. Wang, L. Wang, S.-F. Wang, S.-J. Wang, T.-G. Wang, W. Wang, X.-Q. Wang, Y.-L. Wang, Y.-R. Wang, Z. Wang, Z.-S. Wang, N.-Y. Wen, M. de Wit, S.-F. Wu, D. Xu, D.-D. Xu, H.-G. Xu, X.-J. Xu, R.-X. Xu, Y.-Q. Xue, S.-Z. Yi, J. Yu, L.-W. Yang, F. Yuan, S. Zhang, W. Zhang, Z. Zhang, Q. Zhong, Y. Zhou, W.-X. Zhu

Proceedings Volume 11444, 114442S (2020) https://doi.org/10.1117/12.2560871

KEYWORDS: Metals, Galactic astronomy, X-ray telescopes, X-rays, X-ray detectors, Spectroscopy, Physics, Cryocoolers, Spectral resolution, Detector arrays

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Proceedings Article | 13 December 2020 Presentation

Frequency domain multiplexing technology of transition-edge sensors for x-ray astronomy

Hiroki Akamatsu, Davide Vaccaro, Luciano Gottardi, Jan van der Kuur, Cor de Vries, Simon Bandler, Marcel Bruijn, James Chervenak, Matteo D'Andrea, Jian-Rong Gao, Jan-Willem den Herder, Ruud W. Hoogeveen, Mikko Kiviranta, Anton van der Linden, Brian Jackson, Antoine Miniussi, Kenichiro Nagayoshi, Kevin Ravensberg, Marcel Ridder, Kazuhiro Sakai, Stephen Smith, Emanuele Taralli, Sven Visser, Nicholas Wakeham, Martin de Wit

Proceedings Volume 11444, 114440Y (2020) https://doi.org/10.1117/12.2561271

KEYWORDS: Multiplexing, Sensors, Fused deposition modeling, Sensor technology, X-ray astronomy, X-rays, Resonators, Observatories, Quantum efficiency, Spectral resolution

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Proceedings Article | 13 December 2020 Presentation + Paper

Development of microwave multiplexer for the Super DIOS mission: 38 transition-edge sensor x-ray microcalorimeter readout with microwave multiplexing

Yuki Nakashima, Fuminori Hirayama, Satoshi Kohjiro, Hirotake Yamamori, Shuichi Nagasawa, Akira Sato, Shinya Yamada, Ryota Hayakawa, Noriko Yamasaki, Kazuhisa Mitsuda, Kenichiro Nagayoshi, Hiroki Akamatsu, Luciano Gottardi, Emanuele Taralli, Marcel Bruijn, Marcel Ridder, Jian-Rong Gao, Jan Willem den Herder

Proceedings Volume 11454, 1145412 (2020) https://doi.org/10.1117/12.2560819

KEYWORDS: Microwave radiation, Sensors, Multiplexers, Multiplexing, X-rays, Photons, X-ray detectors, Fused deposition modeling, Physics, Signal detection

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Proceedings Article | 6 July 2018 Paper

Development of TiAu TES x-ray calorimeters for the X-IFU on ATHENA space observatory

P. Khosropanah, E. Taralli, L. Gottardi, C. P. de Vries, K. Nagayoshi, M. L. Ridder, H. Akamatsu, M. P. Bruijn, J.-R. Gao

Proceedings Volume 10699, 106991M (2018) https://doi.org/10.1117/12.2313439

KEYWORDS: Tellurium, X-rays, Gold, Magnetism, Sensors, Fused deposition modeling, Resistance, Bismuth, Measurement devices, Space observatories

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Showing 5 of 7 publications

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