Kavli Affiliate: Noah Kurinsky
| First 5 Authors: Dylan J Temples, Osmond Wen, Karthik Ramanathan, Taylor Aralis, Yen-Yung Chang
| Summary:
Microcalorimeters that leverage microwave kinetic inductance detectors to
read out phonon signals in the particle-absorbing target, referred to as
kinetic inductance phonon-mediated (KIPM) detectors, offer an attractive
detector architecture to probe dark matter (DM) down to the fermionic thermal
relic mass limit. A prototype KIPM detector featuring a single aluminum
resonator patterned onto a 1-gram silicon substrate was operated in the NEXUS
low-background facility at Fermilab for characterization and evaluation of this
detector architecture’s efficacy for a dark matter search. An energy
calibration was performed by exposing the bare substrate to a pulsed source of
470 nm photons, resulting in a baseline resolution on the energy absorbed by
the phonon sensor of $2.1pm0.2$ eV, a factor of two better than the current
state-of-the-art, enabled by millisecond-scale quasiparticle lifetimes.
However, due to the sub-percent phonon collection efficiency, the resolution on
energy deposited in the substrate is limited to $sigma_E=318 pm 28$ eV. We
further model the signal pulse shape as a function of device temperature to
extract quasiparticle lifetimes, as well as the observed noise spectra, both of
which impact the baseline resolution of the sensor.
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