Abstract
In this paper, we propose an extended interaction oscillator (EIO) operating with a high-order mode in the Y band. Compared to the conventional EIO operating with the fundamental mode, it operates with the TM31 mode. Since it operates with a high-order mode, the inner surface of the EIO is much larger, which increases the power capacity of the device. The difficulty in manufacturing such an enlarged cavity is thereby mitigated. By optimizing the multi-gap structure, designing the magnet subsystem, and preparing the e-gun subsystem, the configuration of EIO is confirmed. Finally, through particle-in-cell simulations, the performance of this device is studied. Under the conditions of 15 kV and 150 mA for the beam, the output power was around 85 W with a frequency of 338.4 GHz. The output signal was stable, showing the high reliability of this device.
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