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To meet the compactness requirement of cavities for accelerator-based neutron sources, this paper proposes a resonant coupled accelerating cavity design consisting of a ladder Radio Frequency Quadrupole (RFQ) and an Interdigital H-mode Drift Tube Linac (IH-DTL). This cavity combines the advantages of high bunching efficiency of RFQ and high acceleration efficiency of DTL, with an integrated connected structure. The ladder RFQ uses alternate support plates to fix electrodes, creating a TE210 field, while the IH-DTL builds a TE110 field via 15 alternately supported drift tubes. By designing the tail support plates of the RFQ as semi-support plates and optimizing the coupling gap phase, resonant coupling between the TE210 and TE110 modes is achieved (mode spacing > 5 MHz), eliminating the traditional Medium Energy Beam Transport (MEBT) transition section and redundant RF systems. The coupled cavity accelerates the proton beam to 2.5 MeV with a peak current of 15 mA and a total length of 2.11 meters. It features an electric field non-uniformity of less than 3% and a transmission efficiency exceeding 98.5%, featuring a compact structure and stable performance. An aluminum model cavity has been fabricated to verify the electromagnetic field distribution and mode coupling characteristics, and cold tests of the overall structure are currently underway.
Keywords: coupled accelerating cavity; ladder RFQ; IH-DTL; resonant coupling; compact accelerating structure
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