Relation between dynamic parameters and limiting current in separated function radio frequency quadrupole accelerator

Abstract

The particles' motion in separated function radio frequency quadrupole (SFRFQ) accelerator is analyzed in this paper. Compared to conventional radio frequency quadrupole accelerator, the SFRFQ structure has higher accelerating efficiency, and the particles are focused or defocused by the quadrupole outside the diaphragms. The relation between limiting current and dynamic parameters has been deduced, so the transverse and longitudinal stability of particles in SFRFQ is ensured by selecting proper dynamic parameters.