Cold testing of a high power gyroklystron-accelerator interface

At the University of Maryland, we have been evaluating the use of gyroklystrons to drive RF accelerators (Latham et al., 2004). In order to use our 500 kV, 500 A system to energize a 17.136 GHz accelerator structure built by the Haimson Research Corporation (HRC) (Haimson and Mecklenburg, 1998), we need to construct an interface that converts the gyroklystron TE₀₂ output mode into two standard rectangular WR42 waveguide modes. This structure needs to support up to 80 MW of pulsed power (1 μs pulses) in a high-vacuum (∼10^-8 T) environment. The design and cold test results for this system will be presented.