Construction of the CEBAF RF separator

The CEBAF accelerator is designed in a multipass racetrack configuration, with two 1497 MHz linear accelerator sections joined by independent magnetic transport arcs. Room temperature subharmonic RF separator cavities will be used on each independent are to extract a portion of the recirculating beam, and one additional cavity will be used to divide the final full-energy beam between CEBAF´s three experimental end stations. A single-cell prototype cavity has already been built and tested at low power levels. The next stage of the design process is the construction of a cavity capable of operation at full power, i.e. at a gradient sufficient to provide the required 100 μrad bend to a 6 GeV beam. The paper will discuss both the electrical and mechanical design of the cavity, construction techniques employed, and preliminary test results