Design and measurements of SFRFQ cavity

Separated Function Radio Frequency Quadrupoles (SFRFQ) structure is a new post accelerator of RFQ, the higher accelerating efficiency and transmission make it become a proper choice for the post acceleration after the integral split ring RFQ (ISR RFQ)-1000 accelerator at Peking University [Y.R. Lu, J.F. Guo, W.G. Li, et al., Nucl. Instr. and Meth. A 420 (1999) 2]. A novel design strategy is proposed in this paper to avoid the sparking problem and decrease the energy spread at the exit of SFRFQ. Correspondingly, a code SFRFQCODEV1.0 was developed specially for beam dynamic simulations and error studies. A prototype cavity with 14 accelerating gaps has been constructed and tested at low and high RF power successfully. The operating energy region of SFRFQ structure and the results of error study are presented.