A computer code for beam dynamics simulations in SFRFQ structure

A computer code (SFRFQCODEv1.0) is developed to analyze the beam dynamics of Separated Function Radio Frequency Quadruples (SFRFQ) structure. Calculations show that the transverse and longitudinal stability can be ensured by selecting proper dynamic and structure parameters. This paper describes the beam dynamical mechanism of SFRFQ, and presents a design example of SFRFQ cavity, which will be used as a post accelerator of a 26 MHz 1 MeV O+ Integrated Split Ring (ISR) RFQ and accelerate O+ from 1 to 1.5 MeV. Three electrostatic quadruples are adopted to realize the transverse beam matching from ISR RFQ to SFRFQ cavity. This setting is also useful for the beam size adjustment and its applications.