论文部分内容阅读
本文利用相关检测技术,并对测试管结构作了改进,很好地抑制了热电子本底及空间电荷效应,构成一种测量热阴极在工作温度下次级电子发射性能的新方法。以浸渍钪酸盐阴极为样品,测得在低的轰击电子能量和电子流情况下次级电子发射系数占随温度指数上升;轰击电子能量或轰击电子流较大时,温度对δ没有很大的影响。研究表明高温下钪酸盐阴极存在电子轰击热发射增大效应,对此本文提出“内建场模型”加以解释。
In this paper, a new method of measuring the secondary electron emission performance of the hot cathode at the working temperature is developed by using the relevant detection technology and the structure of the test tube is improved. The hot electron background and the space charge effect are well suppressed. The immersion Scandate Cathode as a sample, measured at low bombardment electron energy and electron flow secondary electron emission coefficient accounts for temperature rise; bombardment electron energy or bombardment electron flow is large, the temperature of δ is not large Impact. Studies have shown that there is electron bombardment heat emission enhancement effect of scandate cathode at high temperature, this paper proposed “built-in field model” to be explained.