Abstract
For X-ray applications, microcalorimeters are increasingly dependent on the superconducting transition-edge sensor (TES) technology. We are developing TES devices based on Mo–Cu bilayer films for the proposed Hot Universe Baryon Surveyor (HUBS) satellite mission. To investigate the possible impact of a space radiation environment on the stability of the bilayer films, we conducted an irradiation experiment on Mo–Cu bilayer samples with 1 MeV protons at room temperatures and liquid nitrogen temperatures. With data recorded in real time, we noticed that the changes in the electrical resistance of the film samples were not apparent during irradiation at room temperatures, before and after irradiation, but were evident at liquid nitrogen temperatures. Furthermore, following the irradiation runs, we warmed up the irradiated film samples and placed them in a refrigerator to measure their superconducting transition temperatures (\(T_\textrm{c}\)) and residual resistivity (\(\rho _{3\textrm{K}}\)). We found no systematic change in \(T_\textrm{c}\) and \(\rho _{3\textrm{K}}\). We discuss the results in terms of the vacancies and interstitials in the test samples that are produced by irradiation, as well as the effects of heating caused by irradiation.
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The authors declare that the data supporting the findings of this study are available within the paper. Should any raw data files be needed in another format they are available from the corresponding author upon reasonable request.
Notes
Ziegler, James F., Ziegler, M. D., and Biersack, J. P., SRIM-2013: The Stopping and Range of Ions in Matter Software (Version 2013). Available from http://www.srim.org.
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Acknowledgements
We thank the anonymous referees for their helpful comments that have significantly improved the manuscript. This work was supported in part by National Natural Science Foundation of China (NSFC) through Grants 11927805 and 12220101004, and by China National Space Administration (CNSA) through a technology development grant. We also wish to acknowledge financial support by the Open Research Fund from the State Key Laboratory of Nuclear Physics and Technology, Peking University under Grant No. NPT2021KFJ22.
Funding
This work was supported in part by National Natural Science Foundation of China (NSFC) through Grant 11927805 and 12220101004, and by China National Space Administration (CNSA) through a technology development grant. We also wish to acknowledge financial support by the Open Research Fund from the State Key Laboratory of Nuclear Physics and Technology, Peking University under Grant No.NPT2021KFJ22.
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Jiao Ding wrote the main manuscript text and prepared all figures. Jiao Ding, Fajun Li, Yeru Wang, Wei Cui, and Yuan Gao reviewed the manuscript.
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Ding, J., Li, F., Wang, Y. et al. Irradiation of Mo–Cu Superconducting Bilayer Films with MeV Protons. J Low Temp Phys 215, 33–45 (2024). https://doi.org/10.1007/s10909-024-03058-5
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DOI: https://doi.org/10.1007/s10909-024-03058-5