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The accelerator-driven compact neutron source systems RANS and RANS-II have been operated at RIKEN for many years. To enable on-site applications, the development of a transportable neutron source system, RANS-III, has been initiated, requiring significant reductions in size and weight for automobile transportation. To meet this requirement, a compact four-vane RFQ linac operating at 500 MHz was developed. The 500 MHz RFQ was designed to accelerate protons to the same output energy as the RANS-II RFQ to achieve a similar neutron energy spectrum. The design reduces the cavity diameter to approximately half that of RANS-II and the total weight to about one third. The total required RF power is 300 kW, supplied by four independent 75 kW amplifier subsystems to reduce RF voltage at each coupler port. The RFQ linac was fabricated, integrated with the ion source, and beam commissioning demonstrated proton acceleration. The accelerator system was installed on a trailer, transported to an indoor test facility, and neutron production was achieved by bombarding a lithium target. This paper reports the design concept, RF system, and commissioning results of the 500 MHz RFQ linac for RANS-III.
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