Abstract
The dielectric micro calorimeter (DMC) is a novel radiation detector utilizing a GHz resonator with dielectric thermometer (Sekiya et al. in J Low Temp Phys 167:435, 2012). The advantage of using a DMC is that the detection mechanism is based on a phonon mediation without Johnson noise and quasi-particle decay process. A large format array of DMCs can be easily multiplexed by a resonator circuit in the readout at GHz band width. We describe the design of a DMC as an X-ray photon counter. It is optimized to detect photon at 5.9 keV energy. We consider \(^{18}\)O-doped SrTiO\(_3\) (STO18) and Nb-doped KTa\(_{(1-x)}\)Nb\(_{x}\)O\(_{3}\) (KTN) as a candidate of dielectric thermometer. Dielectric materials which have sensitivity \(\alpha \)(= d\(\log {C_{\mathrm {el}}}/d\log {T}\)) are also ideal for our application. We check that both STO18 and KTN have \(\alpha {\sim } 10^{3}\) at 100 mK. If we assume a DMC resonator operating at 100 mK, we need a Q value of a resonator to be 2000 for X-ray detection.
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Acknowledgments
We are grateful to Dr. Kazuhiro Sakai for his practical advice. This work was financially supported by JSPS Grants-in-Aid (KAKENHI 24656064, 26220703 and 21340046).
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Kikuchi, T., Hoshino, M., Nakayama, T. et al. The Design and Characterization of Dielectric Microcalorimeters for X-ray Photon Detection. J Low Temp Phys 184, 250–256 (2016). https://doi.org/10.1007/s10909-016-1587-8
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DOI: https://doi.org/10.1007/s10909-016-1587-8