70 mev electron racetrack microtron commissioning

We have designed, built, and begun commissioning our compact 70 MeV Race-Track Microtron (RTM), which includes Rare-Earth Permanent Magnet dipoles, a narrow rectangular accelerating structure with Radio-Frequency Quadrupole focusing, and a pre-bunched electron gun beam injected through a compact fixed-gradient REPM /spl alpha/-magnet. Here we reprise the accelerator design and present commissioning results to date.