Scalable low-frequency microwave cavities for the Project 8 neutrino mass experiment*

Project 8 is a next-generation experiment aiming to directly measure the neutrino mass using the tritium endpoint method, with a targeted sensitivity of 40 meV. Recently, Project 8 has for the first time used the Cyclotron Radiation Emission Spectroscopy (CRES) technique to measure the tritium beta-decay spectrum endpoint and place an upper limit on the absolute scale of the neutrino masses. The next development phase will demonstrate CRES in a large source volume, culminating in a pilot-scale CRES experiment with sub-eV sensitivity. Project 8 is investigating the use of large scale cylindrical microwave cavities operating at low frequencies (150 MHz - 1 GHz) as a means of signal extraction. I will introduce the cavity-based CRES concept, present recent progress in the novel experimental design of these cavities, and highlight the next steps for a 40 meV sensitivity neutrino mass measurement.