Abstract
Microwave kinetic inductance detector (MKID) is one of the candidates of focal plane detector for future satellite missions such as LiteBIRD. For the space use of MKIDs, the radiation tolerance is one of the challenges to be characterized prior to the launch. Aluminum (Al) MKIDs with 50 nm thickness on silicon substrate and on sapphire substrate were irradiated with a proton beam of 160 MeV at the heavy ion medical accelerator in Chiba. The total water-equivalent absorbed dose was \(\sim \)10 krad which should simulate the worst radiation absorption of 5 years observation at the Lagrange point L2. We measured characteristics of these MKIDs before and after the irradiation. We found no significant changes on resonator quality factor, responsivity, and recombination time of quasi-particles. The change on electrical noise equivalent power was also evaluated, and no significant increase was found at the noise level of \(O(10^{-18})\) W/\(\sqrt{ \mathrm{Hz} }\).
Notes
\(T_\mathrm{c}\) did not show any significant change between before and after the irradiation experiment. This means \(\Delta \) was not changed significantly, either.
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Acknowledgments
The irradiation test was supported by H. Kitamura under Research Project with Heavy Ions at NIRS-HIMAC. We would like to thank Atsuko Kibayashi for useful simulation and discussion about energy loss on a MKID device. This work was partially supported by Grants-in-Aid for Scientific Research from The Ministry of Education, Culture, Sports, Science, and Technology, Japan (KAKENHI Grant Number 25247022).
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Karatsu, K., Dominjon, A., Fujino, T. et al. Radiation Tolerance of Aluminum Microwave Kinetic Inductance Detector. J Low Temp Phys 184, 540–546 (2016). https://doi.org/10.1007/s10909-016-1523-y
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DOI: https://doi.org/10.1007/s10909-016-1523-y