LaB_阴极电子枪具有亮度高、寿命长、交叉点小,能量分散度小、相干性好、束流稳定性好等优点,目前已逐渐取代发叉式钨丝阴极而广泛用于各种仪器。由于生产厂家和型号的不同,电子枪和阴极支架的结构也各不一样,彼此不能通用。为了便于推广使用LaB_6阴极,我们研制成功通用型夹持式LaB_6单晶阴极,可直接装到各种 LaB_ cathode electron gun has the advantages of high brightness, long life span, small cross point, small energy dispersion, good coherence and good beam stability, and has gradually replaced the fork-type tungsten filament cathodes and is widely used in various instruments. Due to the different manufacturers and models, the structure of the electron gun and the cathode holder are also different, and they can not be used universally. In order to facilitate the promotion of the use of LaB_6 cathode, we have successfully developed a common type of LaB_6 single crystal cathode clamp, can be directly loaded into various