A high-current RFQ accelerator for the ADS system in China

An intense-beam Radio Frequency Quadrupole (RFQ) accelerator is under construction at Institute of High Energy Physics (IHEP), Beijing. It accelerates a proton beam with an average current of 3mA at a 6 % duty factor to 3.5 MeV from 75 keV. This four-vane type 352-MHz RFQ has a length of 4.7m and is separated into two resonantly coupled segments. This paper will present the physics design and the technology development of the RFQ, including the beam dynamics design study, the measurement of cold models, quadrupole and dipole field tuning of the long cavity, and the RF power source system. Now, the RFQ is being installed, and the beam tuning will start in 2006.