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Abstract. Sheet Beam Klystron (SBK) is a device employing rectangular/elliptical cross section beam. The barbell cavity for SBK has been designed providing uniform flat electric field profile across the width of the cavity. The loop coupling arrangement has also been designed using CST Microwave studio software tool and optimized for maximum return loss. The designed barbell cavity has been re-optimized after the insertion of the loop coupling to provide flat electric field profile across the width of the cavity. The cavity has also been fabricated and initial characterization has been carried out. The simulated results and the experimental results matches closely.

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