Microwave Cavity Axion Dark Matter Search from 3.3 to 12.4 μeV at IBS/CAPP

The CAPP-12TB experiment is a resonant microwave cavity axion search at IBS/CAPP in KAIST for the axion mass range 3.3 - 12.4 μeV. The system consists of a 12 T SC magnet with a bore size of 320 mm, a cryogenic system with physical temperatures around 50 mK, a high-Q, large volume (30 L) cavity with a copper tuning rod, and nearly quantum-limited noise SQUID amplifiers. The first phase of the experiment is under development with the cavity design being optimized through simulation studies. A new design is introduced in order to resolve the issue of so-called mode mixings - mixture of the desired resonant mode with unwanted modes during the frequency tuning process, which were present in the conventional cylindrical cavity. In this presentation, preliminary results of the improved cavity design are presented and plans of the upcoming stages of the experiment are discussed.