浸渍钪酸盐钡钨阴极的次级发射特性的研究
AN INVESTIGATION ON SECONDARY EMISSION PROPERTIES OF IMPREGNATED BARIUM SCANDATE DISPENSER CATHODES
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摘要: 本文利用扫描电子束探针法,研究了渍制钪酸盐钡钨阴极在室温下的次级发射特性,观察了激活程度对该阴极的次级发射特性、次级发射图象和次级发射面分布的影响。激活最佳时,可获m=3.56(Epm=700V)。在温度高于1100℃下激活,对的影响较大。该阴极表面的分布是不均匀的。面分布曲线的峰值半高宽度为0.4。本文结合国内外对该阴极表面分析研究的结果,对实验现象进行了讨论。从理论上推导出的二项式面分布曲线能与实验结果较好地符合。Abstract: A scanning electron probe is used to study the secondary emission property of the impregnated barium scandate dispenser cathode, the influence of the activation on the secondary emission property, the secondary emission image and the secondary emission distribution over the surface of the cathode. At optimal activity, m =3.56, Epm= 700eV. The activation has larger effect on the when the activation temperature is higher than 1100℃. The distribution over the surface of the cathode is non-uniform. The half-peak width of the distribution curve over the surface is 0.4. The experimental phenomena are discussed in relation to the surface analysis of the cathode, Thbe theoretically derived binomial distribution curves over the surface are better fitted with the experminental results.
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