微波射频场在微波管中产生爆炸电子发射特性初步分析  

Characteristic analysis of explosion electron emission in microwave tube resulted from microwave radiation field

作　　者：罗皓飞[1] 杨建华[1] 林加金[1] 高飞[1] 

机构地区：[1]国防科学技术大学光电科学与工程学院,长沙410073

出　　处：《强激光与粒子束》2011年第11期3024-3028,共5页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(10975186)

摘　　要：对微波射频场在微波管内引起的场致发射和爆炸电子发射及等离子体的产生进行了分析,推导了等离子体产生强度与微波振幅、材料的电阻率、热传导系数、质量密度和比热容之间的关系,得到了晶须温度分布的表达式,通过数值解析的方式总结出在远大于微波周期的时间尺度上晶须温度提高随时间线性上升。在模型所述材料特性下,温度的上升率达到了3.22×1010℃/s,在100ns量级就可以使晶须发生气化形成等离子体。The paper describes the explosion electron emission resulted from microwave radiation field in microwave tube,including the analysis of alternating field-emission and the temperature distribution on the whisker.The deduced equation provides the heating speed of the whisker,besides the relation of produced plasma intensity with amplitude of microwave,electric conductivity,thermal conductivity,mass density and specific heat capacity.When the time is much longer than the period of microwave,the whisker temperature increases linearly with time.The rise ratio of the temperature can reach 3.22×1010 ℃/s,and the whisker may gasify and form plasma in a timescale of hundred nanoseconds.

关 键 词：场致发射 爆炸电子发射 脉冲缩短 频率 晶须 微波 

分 类 号：TN122[电子电信—物理电子学]