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本文概述并讨论了由休斯电子动力部门承担的长寿命、大电流密度阴极的研制工作。在电流密度高达1安培/厘米~2,甚至更高的情况下,要求阴极的使用寿命长达7～10年,这就推动了现有阴极技术的发展。当前,大电流密度收敛枪使用的最可靠的阴极,是钡钨储备阴极。然而众所周知,此类阴极的性能随工作时间的增加而衰减,其衰减率在很大程度上取决于温度。我们可以由一个老化模型来理解休斯电子动力部门的寿命试验资料。此模型的依据,是努森流的时间关系所控制的阴极表面损耗。本文讨论了这个模型,并讨论了在一定程度上依据此模型的予言而做的一些试验。
This article outlines and discusses the development of long-lived, high-current-density cathodes that Hughes Electronics has taken on. At current densities up to 1 A / cm 2 or even higher, cathodes are required to last as long as 7 to 10 years, which is driving the development of existing cathode technologies. Currently, the most reliable cathode for use with high-current density convergence guns is the barium-tungsten-storage cathode. However, it is well known that the performance of such cathodes decays with increasing working time, and the rate of decay depends very much on temperature. We can interpret the lifetime test data from Hughes Electronic Power by an aging model. The basis of this model is the cathodic surface loss controlled by Knudsen’s time. This article discusses this model and discusses some experiments based to some extent on the prepositions of this model.