Abstract
Kinetic Inductance Detector (KID) is an exciting device that promises high sensitivity to photons from submillimeter waves to gamma-rays with large format arrays. The KID consists of a superconductor thin film microwave resonator combined with a transmission line. When energy accumulates, Cooper pairs in the superconductor films are broken. Then quasiparticles are produced. This change increases the kinetic inductance in the resonant circuits and can be monitored by the transmission line. We propose that Lumped Element KID (LEKID) is implemented on Calcium Fluoride (CaF2) substrate for next-generation astroparticle experiments. 48Ca is one of the double-beta decay nuclei, and 19F is sensitive to spin-dependent elastic scattering with dark matter. The LEKID on CaF2 can be cooled to 15mK using a dilution refrigerator. At this stage, the quality factors of the LEKID are about 500×103, and measurement for particle detection using 241Am particle irradiation is also demonstrated at this low temperature.
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