Spindt阴极可靠性物理问题

摘要

本文研究了Spindt阴极不可靠的主要原因,是其结构中的肖特基二极管.将肖特基二极管从Spindt阴极中移去,可消除其打火现象;用浇铸法或其他方法在金属基片上制造微尖阵列,可以实现可靠的场致发射阴极;双栅极微尖阵列可以改善电子注的聚焦特性,有助于推动其在微波管和太赫兹管中的应用.%The reliability improvement for Spindt cathode are discussed in this paper.The Schotteky diodes in Spindt cathodes are the sources for flashover along oxide walls in cathode cavities.Therefore,move the Schotteky diodes out of Spindt cathodes will improve the Spindt cathodes reliability.The Gray and Green molding process method can be used to make micro-tip array cathode on the metal substrate.Our and other group experiments show that high emission current could be obtained from this cathode and its life time also can be prolonged.