氧化物阴极次级电子发射系数的温度特性

Effect of Temperature on Secondary Electron Emission Yield of Oxide Cathode

在正交场微波器件中,氧化物阴极在高温下的次级电子发射系数是一个相当重要的参数,但是由于氧化物阴极表层低的导电性能以及在高温下极不均匀的热电子发射造成的本底噪声和空间电荷的限制,使得对高温下阴极的次级电子发射性能的研究一直是阴极电子学中的一个难题,国外在这一方面已进行了较多的研究工作,但至今未见有根本解决这一难题的报导。

The occurrence of bombardment-enhanced thermionic emission and the correctness of internal field model have been further proved by measuring the temperature effect on SEE yield and the state of SEE pulse of oxide cathodes. Because of enhanced thermionic emission the SEE yield increases exponentially with temperature when measured at low primary electrons but has little change at high primary electrons. The view of this paper is that the SEE yield measured at high primary electrons accords with true SEE yield of the cathode.