一、概述电子器件特别是超高频电子器件近十多年来发展极为迅速,特别是,随着空间技术的发展,要求长寿命行波管。阴极是电子器件的心脏,必须首先做到长寿命。影响阴极寿命的因素很多,我们认为:要延长阴极寿命,必须提高阴极的发射能力,增强阴极的活性,从而保证在器件支取的电流密 I. Overview Electronic devices, especially ultra-high frequency electronic devices, have developed extremely rapidly in the past decade or so. In particular, with the development of space technology, long-life traveling wave tubes are required. The cathode is the heart of the electronic device and must first be long-lived. Many factors affect the life of the cathode, we believe that: to extend the life of the cathode, we must increase the cathode launch capability and enhance the cathode activity, thus ensuring the device draw current density