Plans for a Two Stage 450 MeV Cascade Microtron

We report some alternative plans for obtaining continuous electron beams with energies of about 450 MeV by using two microtrons in series. The first stage could be the accelerator we are now operating, which is a six transversal Microtron Using a Superconducting Linac, MUSL-2. The second stage would include another linac which can sustain an r.f. field continuously and a higher energy recirculation system. The recirculation that is best understood and seems to have the least distortion is the conventional microtron with a pair of 180° bending magnets such as are used in MUSL-2. The alternative recirculation system uses four 90° bending magnets, and could be extended to higher energy more easily.