A technique for generating potent positron beams

This paper reports on a novel scheme that has the potential to generate intense positron beams. It is based on the modified betatron accelerator, a compact high-current device that has been developed in the last few years. Briefly, the proposed accelerator consists of two modified betatron accelerators that are stacked together and share the same core. The electrons are accelerated in the upper torus during the first half of the flux waveform when the time rate of the magnetic flux (varphi) is positive. After completion of the acceleration, the electrons are extracted and guided to a high-Z target producing a positron beam that is accelerated in the lower torus during the second half of the waveform when dvarphi/dt is negative.