二次发射微波电子枪的模拟计算及其特性分析
Simulation and analysis of secondary emission microwave electron gun
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摘要: 采用URMEL-T程序进行了二次发射微波电子枪的腔内电磁计算和特性分析。同时利用URMEL-T得出的腔内轴向电场及自编程序，模拟电子在该高频场作用下的运动。计算表明二次发射微波电子枪确实具有相位选择性，进而探讨了腔形尺寸、射频电场强度对相位选择性和产生二次倍增的有关条件的影响，以及输出电子的能量稳定性。模拟结果表明，这类电子枪（MPG）可得到高电流密度（5303A/cm2）及短脉冲（3.15~10ps）的电子束。Abstract: The development of high-current, short-duration pulses of electrons has been a challenging problem for many years. Micro-pulse-gun (MPG) is a novel concept that employs the resonant amplification of an electron current by secondary electron emission in a RF cavity. Using the computation code URMEL-T, several kinds of RF cavity under the frequency of 2856MHz were calculated and optimized, the magnetic and electric field distribution in them were got. Through particle-in-cell (PIC) simulation, the self-bunching process in a MPG was proved, the relation between the cavity length and selected phase and the relation between the peak electric field and selected phase were got. With cathode material of high secondary emission coefficient, the MPG can produce high current densities (1132~5303A/cm2
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Key words:
- rf gun /
- secondary emission /
- micro pulse /
- self-bunching /
- cold cathode /
- selected phase
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