浸漬鈧酸鹽鋇鎢陰極的次級(jí)發(fā)射特性的研究
AN INVESTIGATION ON SECONDARY EMISSION PROPERTIES OF IMPREGNATED BARIUM SCANDATE DISPENSER CATHODES
-
摘要: 本文利用掃描電子束探針法,研究了漬制鈧酸鹽鋇鎢陰極在室溫下的次級(jí)發(fā)射特性,觀察了激活程度對(duì)該陰極的次級(jí)發(fā)射特性、次級(jí)發(fā)射圖象和次級(jí)發(fā)射面分布的影響。激活最佳時(shí),可獲m=3.56(Epm=700V)。在溫度高于1100℃下激活,對(duì)的影響較大。該陰極表面的分布是不均勻的。面分布曲線的峰值半高寬度為0.4。本文結(jié)合國內(nèi)外對(duì)該陰極表面分析研究的結(jié)果,對(duì)實(shí)驗(yàn)現(xiàn)象進(jìn)行了討論。從理論上推導(dǎo)出的二項(xiàng)式面分布曲線能與實(shí)驗(yàn)結(jié)果較好地符合。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.
-
白振綱等,電子學(xué)通訊,3(1981), 191.[2]I. Brodie, R. O. Jenkins, Brit. J. Appl. Phys, 8(1957), 202.[3]V. A. Alekseyev, V. N. Lepeshinskays, Radio Engineering and Electron Physis, 10(1965), 502.[4]L. Lesensky et al., 8th Conf. on Tube Techniques, New York, 1966, 236.[5]陳隆華,李洪武,用正交試驗(yàn)法選擇鋇鎢陰極制造方法,第四屆全國電真空學(xué)術(shù)年會(huì)論文,上海,1982年.[6]R. E. Thomas, C. D. Morrill, Appl. Sur. Sci., 16(1983), 292.[7]楊凌云,毛獨(dú)立,電子科學(xué)學(xué)刊,9(1987), 359-363.[8]蘇熙春等, 鈧酸鹽陰極表面研究的進(jìn)展,第四屆全國電真空學(xué)術(shù)年會(huì)論文,上海,1982年. -
計(jì)量
- 文章訪問數(shù): 2046
- HTML全文瀏覽量: 143
- PDF下載量: 438
- 被引次數(shù): 0
下載:
