High average current electron guns for high-power free electron lasers
High average current electron guns for high-power free electron lasers
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用于高功率自由电子激光器的高平均电流电子枪
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
C. Mitchell
中科院分区：
文献类型：
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作者：
P. Sprangle;J. Peñano;B. Hafizi;D. Gordon;S. Gold;A. Ting;C. Mitchell
高平均功率自由电子激光器（FEL）需要高平均电流的电子注入器能够产生高质量的，短持续时间的电子聚束，重复率等于射频直线加速器的频率。在本文中，我们提出，分析和模拟射频门控，栅极电子枪用于高平均功率自由电子激光器。热离子阴极可以提供必要的高电流，具有长寿命，并需要适度的真空。在所提出的配置中，射频门控栅极在直线加速器频率的基波和三次谐波处调制。在栅极上添加第三谐波导致较短的电子聚束。在这种配置中，直线加速器加速场的每个射频桶包含一个电子聚束。粒子模拟表明，这种方法可以提供必要的电荷每聚束，聚束持续时间，纵向和横向发射度，和重复率的高平均功率自由电子激光在IR制度。
High average power free-electron lasers (FELs) require high average current electron injectors capable of generating high quality, short duration electron bunches with a repetition rate equal to the frequency of the rf linac. In this paper we propose, analyze, and simulate an rf-gated, gridded thermionic electron gun for use in high average power FELs. Thermionic cathodes can provide the necessary high current, have long lifetimes, and require modest vacuums. In the proposed configuration the rf-gated grid is modulated at the fundamental and 3rd harmonic of the linac frequency. The addition of the 3rd harmonic on the grid results in shorter electron bunches. In this configuration, every rf bucket of the linac accelerating field contains an electron bunch. Particle-in-cell simulations indicate that this approach can provide the necessary charge per bunch, bunch duration, longitudinal and transverse emittance, and repetition rate for high average power FELs operating in the IR regime.