DESIGN CONCEPTS FOR AN RF DEFLECTING CAVITY-BASED SPREADER FOR A NEXT GENERATION FEL*

The Lawrence Berkeley National Laboratory (LBNL) is developing design concepts for a multi-beamline soft Xray FEL array powered by a superconducting linac with a bunch repetition rate of about one MHz [1]. A beam spreader will transport the electron beam to any FEL line with minimal beam loss at any operational energy and rate. This paper documents a novel spreader system, described in detail in [2], where the use of RF Deflectors (RFD) as fast-switching devices is proposed.