CAL: A Solenoidal Lumped-element Axion Search

The QCD axion is a well-motivated dark matter candidate that would also solve the strong-CP problem. The DMRadio experimental program is using lumped-element detectors to pioneer the search for QCD axions at masses below 1 μeV. To scale up these detectors, future experiments in the DMRadio program require advancements in magnet and pickup technologies. Cal Axion LC (CAL) is a DMRadio experiment that aims to reach a new parameter space for neV-scale axions while demonstrating the performance of a solenoid magnet design for use in future lumped-element experiments. CAL consists of a coaxial pickup placed in the bore of a 9T solenoid magnet. Axion signals induced on the coaxial pickup will be resonantly enhanced by an LC resonator and read out with DC SQUIDS. In this talk, we will present an overview of CAL and provide an update on its present status.