704 MHz High Power Coupler and Cavity Development for High Power Pulsed Proton Linacs

In the framework of the European CARE-HIPPI program we develop components for superconducting high pulsed power proton linacs at 704 MHz. We have designed, fabricated and tested a beta 0.47 5-cell elliptical cavity with an optimized stiffening to reduce its sensitivity to Lorentz forces. A fast piezo tuner has been developed in order to be able to operate the cavity in pulsed mode in our horizontal test cryostat CryHoLab. We also have carried out the development of a fundamental power coupler. It is designed to transmit a power up to 1 MW at a 10 % duty cycle. A high power test area has been setup consisting of a 1 MW klystron, a pulsed high voltage power supply and a coupler test stand.