摘要
主要讨论了触发电场的脉宽和阴极几何参数对铁电二极管电子发射的影响,通过对不同脉宽激励下的电子发射试验发现触发脉冲的最佳工作宽度范围是150-250ns。对不同几何参数铁电阴极片在正脉冲激励下的电子发射研究指出:一般实验条件下(触发电压小于4kV/mm),触发梯度电场相同时,阴极越厚,条栅电极越细密,发射电流密度越大;极化反转发射中前沿发射方式和后沿发射方式可以共时存在。
The influence of the geometric param eter of the cathode and the width of th e trigger pulse on the electron emission from a diode with a ferroelectric cathode was stu died.The PZT samples with different geometric parameter were tested when a positive driving pulse was applied on the samples.The results indicate,when the trigg er electric field is less than 4kV /mm and the trigger electric field is stead,the thicker the ferroelectric cathode is,the compacter the fen ce electrodes are,the more they contribute on the emission beam current density.And the emissions d ue to polarization reversal may exist on the rise -time or the dece nt -time of the trigger pulse.Besides,the best width of the trigger pulse is scale to 150-250ns.
