Zr-W和Zr-Ir阴极电子枪的特性比较研究

A Comparative Study on the Characteristics of both Zr W and Zr Ir Cathodes Electron Gun

通过对ＺｒＷ阴极和ＺｒＩｒ阴极测试，对２种阴极电子枪的特性进行了比较研究，得出在１９００Ｋ下ＺｒＷ阴极逸出功为２８６ｅＶ，亮度和寿命分别为２．４×１０６Ａ／（ｃｍ２．ｓｒ）和１０００ｈ以上，在１７００Ｋ下ＺｒＩｒ阴极的逸出功为３０２ｅＶ，亮度和寿命分别为１．２５×１０６Ａ／（ｃｍ２．ｓｒ）和３００ｈ以上的结果．做为２种新型阴极。

In this paper,the characteristics of both Zr W and Zr Ir Cathodes are reported through a series of experiments.The results are:Zr W cathode has a work function of 2.86eV,a brightness of 2.4×10 6A/(cm 2.sr) and a service life of 1000h or more at 1900K work temperature,while Zr Ir cathode has comparatively those parameters of 3.02eV,1.25×10 6A/(cm 2.sr) and 300h at 1700K.Both cathodes are attractive substitutes for the Tungsten hairpin and LaB 6 cathodes in regular microscopes.