Design of CEBAF's RF separator and results of cold tests

The design of the Continuous Electron Beam Accelerator Facility (CEBAF) accelerator system is based upon a multipass racetrack configuration, the straight sections of which will utilize 1497-MHz superconducting linac sections with independent magnetic transport at the end of each linac segment. Room-temperature SW RF separators operating at a frequency of 998 MHz will be used in each independent transport channel at one end of the racetrack to extract a portion of the recirculating current. With the frequency chosen and appropriate phasing, three independent beams of correlated energy may be extracted for use in the three experimental areas. The design of the RF separators, based on an alternating periodic structure (APS), are described and some preliminary prototype cold test results are given.