Development of low emittance RF gun by using dual standing mode quasi-traveling wave cavities

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I developed new RF gun which have advanced acceleration cavities. In this gun, a new acceleration method is used. This new acceleration method called quasi-traveling wave mode has two side coupled standing wave mode cavities. Two side coupled cavities which arranged staggered on same axis can realize quasi-traveling wave. If we feed RF power with pi/2 phase difference, acceleration field is similar to traveling wave for accelerated beam. It is suitable for the high charge and low emittance beam generation. RF design and mechanical design of RF gun by using dual standing mode quasi-traveling wave cavities were finished. Its manufacturing was almost finished.