Research on a high-current CW proton hybrid accelerating cavity incorporating coupled four-vane RFQ and CH DTL structures

To enhance the accelerating efficiency of the high-current accelerator for a neutron source, a 100-mA, 162.5-MHz, CW compact hybrid accelerating cavity incorporating inductively coupled four-vane RFQ and CH DTL structures is designed in this paper. The dynamics design, the RF structure design, error analysis, and water-cooling design of the hybrid cavity have been accomplished. The proton beam is accelerated from 80 keV to 0.8 MeV via the RFQ and is further accelerated to 3 MeV by the DTL. The coupling modes of the two-resonant-cavity are analyzed. The designed length of the hybrid accelerating cavity is 3.94 m, and its total power consumption is 101.3 kW.