CW electron accelerators: a review

CW electron accelerator facilities providing beams with energies from a few hundred megaelectronvolts to several gigaelectronvolts, high currents (-100 μA), good energy resolution (-10^-4), good emittance (-10^-8 m-r), and polarized beams are presently under construction. They will provide the capability for carrying out coincidence experiments over a broad kinematic range. Three basic design approaches are being followed: microtrons, linacs with pulse stretcher ring, and recirculating superconducting linacs. The designs have been optimized to take advantage of existing facilities or for costs in a specific energy range