PROTOTYPE MICROWAVE SOURCE FOR A RELATIVISTIC KLYSTRON 2-BEAM ACCELERATOR

A test facility is established at Lawrence Berkeley National Laborator y (LBNL) to study RF power sources for linear colliders based on the R elativistic Klystron two-beam accelerator (RK-TBA) concept, A 24-m lon g prototype source, the RTA, will be constructed in this facility to s tudy physics, engineering, and cost issues related to RK-TBA's, The RT A will generate 200-ns 180-MW RF (11.4-GHz) pulses from each of eight output ports, The major components of the RTA include a 2.8-MeV 1.2-kA induction injector, transverse beam modulator, adiabatic compressor, and RF extraction section. The beam energy is increased to 4 MeV and t he RF bunch length is shortened from 240 degrees to 110 degrees in the adiabatic compressor. The 8-m long extraction section includes 40 ind uction accelerator cells to maintain beam energy at an average 4 MeV, eight equally spaced RF output structures, and a ppm quadrupole focusi ng system, In this paper, we describe the RTA and present results of c omponent testing and computer simulations.