High-current, low-energy RF ion accelerator

The main restriction of a beam current in low-energy RF ion accelerators is the coulomb particle repulsion. The simultaneous achievement of the accelerating and focusing fields high values is necessary to compensate for the high-current beam coulomb fields. That can be realized in the accelerating-focusing system with the resonator placed inside the focusing solenoid. According to estimations, the beam current limit by the transverse coulomb repulsion may be increased up to several amperes and higher by using the superconducting solenoid with the induction of 7-8 T. Theoretical and applied aspects of a beam current increase in ion linacs with superconducting solenoid focusing are considered