Abstract
A compact room-temperature injector is designed to accelerate 100mA proton beam from 45keV to 4.06MeV for the proposed high intensity proton linac at State Key Lab of Nuclear Physics and Technology in Peking university. The main feature is that the Radio Frequency Quadruple (RFQ) and the Drift Tube linac (DTL) sections are merged in one piece at the total length of 276cm. The beam is matched in transverse directions with an compact internal doublet instead of an external matching section in between. The design has reached a high average accelerating gradient up to 1.55MV/m with transmission efficiency of 95.9% at the consideration of high duty factor operation. The operation frequency is chose to be 200MHz due to the already available RF power source. The injector combines a 150cm long 4-vanes RFQ internal section from 45keV to 618keV with a 126cm long H-type DTL section to 4.06MeV. In general the design satisfy the challenges of the project requirements. And the details are presented in this paper.
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