METHOD AND APPARATUS FOR COMPENSATING EFFECTS OF MISALIGNMENT BETWEEN DEFLECTING MAGNETIC FIELDS AND LINEAR ACCELERATOR IN A RACE TRACK MICROTRON

摘要

In a race track microtron a linear accelerator increases the energy of injected electrons and deflecting magnetic fields cause the electrons to follow successively greater orbits passing through the linear accelerator several times. A method and apparatus for compensating for the effects of misalignment between the deflecting magnetic field systems in relation to each other and in relation to the linear accelerator in the race track microtron are disclosed. The new technique involves generating on both sides of the linear accelerator a compensating magnetic field perpendicular to the common plane of the orbits, each compensating field intersecting all complete successive orbits and having a field strength in the regions of the intersections which varies stepwise from intersection to intersection. The magnitude and direction of the compensating magnetic fields may be varied while maintaining a linear relationship between the field strength at each intersection and the energy of properly accelerated electrons travelling in the respective intersecting complete successive orbit.