RF power limits of 4-rod RFQs

There is a long tradition at the Institute of Applied Physics at Frankfurt University of new developments for 4-rod. In the past years, the RF-power front8ier of 4-Rod RFQs has been explored resulting in prototype tests that pushed the power dissipation in cw-mode into the regime of 4-Vane RFQs. For instance, during performance tests of a 6 stem prototype, it could be demonstrated that a 4-Rod RFQ at high frequencies could reach up to 120 kW per meter. In these tests the input power and the electrode voltage was observed using gamma spectroscopy. An overview of activities at the IAP on this topic will be provided.