The injection chicane of the NBS-Los Alamos racetrack microtron

Injection of 5 MeV electrons into the NBS-Los Alamos racetrack microtron is accomplished with a dipole magnet on the linac axis. A three-magnet chicane is used to compensate for the unwanted deflection of recirculating beam by the injection magnet. In order to minimize emittance growth due to power supply noise, the three chicane magnets are driven by two power supplies, with each supply connected in series to two coils in different magnets. This arrangement, together with the tight space available for the chicane, constrains the choice of conductors, and leads to very precise and compact low-field magnets. Magnetic field measurements demonstrate that all design goals have been achieved