Generation of quasiequally spaced ultrashort microbunches in a photocathode rf gun

Generation of quasiequally spaced ultrashort microbunches in a photocathode rf gun
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在光电阴极射频枪中生成准等距超短微束

DOI:
10.1016/j.nima.2014.12.019
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发表时间:
2015-03
期刊:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
影响因子:
--
通讯作者:
Qika Jia
Qika Jia
中科院分区:
其他
文献类型:
--
作者:
Zhigang He;Yuanfang Xu;Weiwei Li;Qika Jia

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光阴极射频枪通过用激光脉冲串照射阴极,可以产生太赫兹亚皮秒电子束,但存在束内电荷不断增加的问题。当纵向空间电荷力开始在束流演化中起重要作用时,太赫兹结构变得模糊并趋于消失。在本文中,我们提出了一种抑制空间电荷力的方案,通过扩大激光脉冲的横向尺寸来降低电荷密度,并采用多单元电子枪来增加束流能量。因此,根据我们的研究,可以产生电荷相对较高的准等间距超短微束。后加速可以用来冻结纵向相空间动力学。该方案原则上能够产生较强的多色窄带太赫兹辐射,为实现可调谐的窄带强太赫兹光源提供了一条很有前途的途径。
A photocathode rf gun can generate trains of THz subpicosecond electron bunches by illuminating the cathode with trains of laser pulses, but it suffers from the increasing charge in the beam. The THz structure blurs and tends to disappear when the longitudinal space charge forces begin to play a significant role in the beam evolution. In this paper, we propose a scheme to restrain the space charge forces by expanding the transverse size of the laser pulses to reduce the charge density and adopting a multicell gun to increase the beam energy. Thus, quasiequally spaced ultrashort microbunches with relatively high charges can be generated according to our studies. Postacceleration can be used to freeze the longitudinal phase space dynamics. The proposed scheme is in principle able to generate intense multi-color narrow-band THz radiation and offers a promising way towards the tunable intense narrow-band THz sources.
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