Current Status of the Superconducting Array for Low-Energy Radiation (SALER) at FRIB

The Superconducting Array for Low Energy Radiation (SALER) experiment is a new experiment using superconducting tunnel junction (STJ) radiation detectors implanted on-line with rare isotopes to search for physics beyond the Standard Model, in particular scalar and tensor current contributions to the weak force. SALER is currently under construction and will be delivered to the Facility for Rare Isotope Beams (FRIB) in early 2024. We present on the status of delivery and initial offline testing of SALER at FRIB and report on theoretical sensitivity estimates of SALER's first physics targets, particularly the lightest mirror nuclei (up to ¹⁹Ne) with the eventual goal of reaching a precision of V_ud at the <0.1% level. We have evaluated the performance of the 128 STJs for Phase I of the SALER experiment using x-rays as well as the performance of the adiabatic demagnetization refrigerator in which the experiment will be operated.