Enhancements of Cherenkov Radiation by Two Electron Beams

Enhancements of Cherenkov Radiation by Two Electron Beams
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两束电子束对切伦科夫辐射的增强

DOI:
10.1109/tps.2011.2181423
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发表时间:
2012-01
影响因子:
1.5
通讯作者:
Yang, Ziqiang
Yang, Ziqiang
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Liu, Wenxin;Liu, Pu-Kun;Yong, Wang;Yang, Ziqiang

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本文提出了一种双电子束驱动切伦科夫辐射源增强的方法。切伦科夫辐射源由柱面光栅组成,具有速度分离的TEB是同心分离的。通过场匹配方法,利用线性化流体理论推导了色散方程,并进行了数值计算。数值结果表明,在优化的电压比下,由于两股流的不稳定性,生长速度得到了显著的提高。此外,借助二维粒子单元模拟,证明了双流不稳定性导致的输出功率的提高,并观察到输出功率随着两电子束间距的增加而减小。
An approach to the enhancement of Cherenkov radiation source driven by two electron beams (TEBs) is presented in this paper. The Cherenkov radiation source is composed of a cylindrical grating, and TEBs with a velocity separation are concentric and separated. By a field matched method, the dispersion equation is derived with a linearized fluid theory and solved by numerical calculation. The numerical results show that a considerable enhancement of growth rate is realized at an optimized voltage ratio due to two stream instability. Moreover, with a help of 2-D particle-in-cell simulations, the improvement of output power induced by the two stream instability is demonstrated, and the decreased of output power is observed as the increased distance of two electron beams.
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