DEVELOPMENT OF THE 3 MeV RFQ FOR THE COMPACT PULSED HADRON SOURCE AT TSINGHUA

We present, in this paper, the design and construction status of a Radio Frequency Quadrupole (RFQ) accelerator for the Compact Pulsed Hadron Source (CPHS) at Tsinghua University. The 3-meter-long RFQ will accelerate protons from 50 keV to 3 MeV at an RF frequency of 325 MHz. In the physics design we have programmed the inter-vane voltage as a function of beam velocity, to optimize the performance of the RFQ, by tailoring the cavity cross section and vane-tip geometry as a function of longitudinal position while limiting the peak surface electric field to 1.8 Kilpatrick. There will be no Medium-Energy-Beam-Transport (MEBT) following the RFQ. We have machined three test sections and the final RFQ accelerator is now under construction. We will describe the status of the RFQ system in this paper.