The Multipactor Electron Gun (MEG) can produce high current self-bunching electron beams. In this paper, the design of an S-band accelerator based on MEG and the result of low power test are presented. The mechanical structure was designed with ability of replacing secondary electron emitters. Pd-Ba alloy and Pt are used as the secondary electron emitters of the MEG. The distance between electrodes and the resonant frequency of the MEG can be adjusted separately by step motors. The parameters of the accelerator tube were optimized by using numerical simulation with the design output energy of 5MeV and an average current of 100mA.
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