The power supply for the beam chopper magnets of a medical synchrotron

Abstract

The ongoing design of the power supply for the beam chopper magnets of a medical synchrotron is presented. The four, series connected beam chopper magnets, which are placed on the extraction line, are used for blanking the beam both during routine operation and for emergency. To let the beam pass the magnets need to be energized with a current, proportional to the beam energy, whose maximum value was calculated to be about 650A. The required current should be reached from zero in less than 260μs and then can be maintained for an arbitrary long time. Finally is should fall back to zero in less than 260μs. The power supply is composed of an high voltage part (2.9kV), which is in charge of the rising and falling current ramp and of a low voltage part (60V) which is in turn responsible for the current flat top.