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引言许多超高频器件的发展,尤共是高频段超低噪声行波管与中功率低噪声行波管的发展,迫切要求氧化物阴极能在尽可能低的工作温度下有高的发射本领。氧化物阴极本是以高发射效率(工作温度
Introduction The development of many ultra-high-frequency devices, especially the development of high-frequency ultra-low noise traveling wave tubes and medium-power low-noise traveling wave tubes, urgently requires the oxide cathode to have a high firing capability at the lowest possible operating temperature . Oxide cathode this is a high emission efficiency (operating temperature