Project of CW race-track microtron-recuperator for free-electron lasers

A project for a race-track microtron-the beam source for a free-electron laser (FEL)-is considered. Utilized in the FEL, the beam will liberate its energy to the RF microtron system when, being decelerated, it passes along the same microtron orbits in inverse sequence. The layout of the microtron is depicted. The microtron comprises an injector, two magnetic straight systems with 180 degrees separating bend, a common straight section with RF cavities (the section is common to electrons of different energy), magnets for the injection and extraction systems, solenoidal magnetic lenses, four separated straight sections with magnetic quadrupole lenses, a FEL magnetic system placed in the fourth straight section, and a beam dump. The design energy of electrons is 35 MeV and the mean current ranges from 0.1 to 1 A.<
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