Speaker
Description
We are developing cryogenic single-crystal detectors with magnetic quantum sensors for sub-GeV DM and CEvNS detection. Magnetic quantum sensors deposited on crystal surfaces provide fast and efficient athermal-phonon collection, which could enable phonon-pulse shape discrimination (PPSD) of electron and nuclear recoil (ER and NR) signals for active background rejection in DM search and CEvNS detection experiments. We are optimizing athermal-phonon collection speed and efficiency using cm-scale sapphire crystals, and have obtained approximately 50% efficiency for athermal-phonon collection. The magnetic sensor’s response time was in an order of 1-microsecond and was sufficient to resolve different athermal-phonon arrival times of ER and NR signals for PPSD. The preliminary results with sapphire crystals and future test plans using scintillating crystals and semiconducting crystals for PPSD will be presented.
This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. This work was funded by the Laboratory Directed Research and Development program of Lawrence Livermore National Laboratory (22-FS-011).
