New Developments in the CRES Technique for Neutrino Mass Measurement

The Project 8 Collaboration is developing next generation technology for neutrino mass measurement based on the Cyclotron Radiation Emission Spectroscopy (CRES) technique. Recently, Project 8 has for the first time used the CRES technique to measure the tritium beta-decay spectrum endpoint and place an upper limit on the absolute scale of the neutrino masses. Future progress towards the Project 8 collaboration's goal of measuring the neutrino mass scale with a sensitivity of 40 meV will require novel technologies for performing CRES in a multi-cubic-meter volume, using magnetically trapped tritium atoms. The Project 8 collaboration has been exploring phased antenna arrays as a technology for performing CRES in large volumes. However, recent progress has revealed that a large RF cavity, with a resonant frequency in the 300 MHz - 1 GHz range, represents a solution for a next-generation neutrino mass experiment with potentially significantly reduced complexity and cost. In my talk, I will introduce the new technologies being developed by the Project 8 experiment to enable CRES measurements in large volumes. First, I will introduce the antenna array approach to CRES and highlight areas of recent progress. Second, I will give a detailed introduction to: the cavity-based CRES concept, the preliminary designs for the RF cavity and signal readout, and the reconstruction algorithms that will enable the next generation of CRES-based experiments in resonant cavities. Finally, I will give an overview of the plans for a set of cavity demonstrator experiments, which set the path towards a 40 meV sensitivity neutrino mass measurement.