Speaker
Description
We report on recent progresses for the new remote magnetic phonon sensing approach to read out massive crystal calorimeters for dark matter detection. The detector consists of a single-crystal target, a magnetic phonon sensor made of an Ag:Er paramagnetic film or superconducting magnetic penetration phonon sensor (MPPS) film deposited on the crystal surface, and a separated SQUID (superconducting quantum interference device) magnetometer positioned in close proximity. In the new MPPS, athermal phonons generated by particle interaction will be absorbed to the MPPS film and break cooper pairs, reducing screening current and changing magnetic penetration depth, producing a magnetic signal that is immediately measured by the SQUID. 7 eV baseline resolution was achieved with a 2mm x 2mm hafnium MPPS sensor, which will be attached to a diamond crystal for future testing.
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 supported by DOE Office of Science HEP Advanced Detector R&D program.