铁电介质阴极电子枪
Electron gun with a ferroelectric material cathode
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摘要: 给出并分析了铁电介质阴极电子枪的初步数值模拟和实验结果。实验表明其发射电子密度可达110A/cm2。该种电子枪产生的电流密度大于阴极发射电子初始能量为零时的空间电荷限制电流,PIC数值模拟结果表明可以通过给发射电子赋予一定的初始能量来解释这一现象,理论分析认为铁电介质阴极发射电子具有初始能量是合理的。Abstract: The simulation and experimental results of electron gun with a ferroelectric material cathode by author in Cornell university are presented in this paper. The results show that the current densities is of order 110A/cm2, experimental. The current generated with the ferroelectric material cathode exceeds space charge limited current, It is considered this is caused by the electric field enhancement near the cathode surface, due to the introduction of trigger pulse, FE effect, and grid structure etc. Enhanced electric field will accelerate electrons to some energy in the district near cathode surface. According to this, The electron gun with ferroelectric material cathode can be simulated and designed by injecting electrons from cathode with an effective initial energy.
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Key words:
- ferroelectric material cathode /
- electron gun /
- intense electron beam
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