ELECTRON CAPTURE IN STATIONARY BETATRON ACCELERATION

The contribution of electrons captured at various regions to the total current of captured electrons was investigated. It was found that the spatial charge created by electrons emitted from the injector before and after capture does not affect the capture conditions. At optimum conditions the capture takes place predominantly near equilibrium orbits. An increased intensity can be achieved by selecting an interval of capture which satisfies nearly equilibrium orbits corresponding to the invariable heterogeneity of a given accelerator. At small emission currents an additional intensity can be developed by contraction effects. (R.V.J.)