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arXiv 2007.12736physics.plasm-phphysics.acc-ph
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从相对论跃迁辐射产生太瓦阿秒脉冲

Generation of terawatt, attosecond pulses from relativistic transition radiation

Xinlu Xu, David B. Cesar, Sébastien Corde, Vitaly Yakimenko, Mark J. Hogan, Chan Joshi, Agostino Marinelli, Warren B. Mori

摘要:

当脉宽为fs、峰值电流为数百kA的电子束穿过真空和高密度等离子体界面时,产生一个称为相对论跃迁辐射(R-TR)的强脉冲$\sim100$,该脉冲包含$\sim$ TW功率的相干真空紫外辐射,并伴有几个脉宽较小的卫星脉冲。该脉冲继承了入射光束场的径向偏振,并具有环形强度分布。当射束密度与等离子体密度相当并且光斑尺寸远大于等离子体趋肤深度时,发射该R-TR。从物理上讲,它是由电子的返回电流或反向相对论运动引起的,这些电子正好从等离子体内部开始,多普勒向上移动发射的光子。R-TR脉冲的数量由在第一等离子体唤醒周期内的不同深度处产生并在相位混合之前相干发射的等离子体电子组的数量确定。

英文摘要:

When a fs duration and hundreds of kA peak current electron beam traverses the vacuum and high-density plasma interface a new process, that we call relativistic transition radiation (R-TR) generates an intense $\sim100$ as pulse containing $\sim$ TW power of coherent VUV radiation accompanied by several smaller fs duration satellite pulses. This pulse inherits the radial polarization of the incident beam field and has a ring intensity distribution. This R-TR is emitted when the beam density is comparable to the plasma density and the spot size much larger than the plasma skin depth. Physically, it arises from the return current or backward relativistic motion of electrons starting just inside the plasma that Doppler up-shifts the emitted photons. The number of R-TR pulses is determined by the number of groups of plasma electrons that originate at different depths within the first plasma wake period and emit coherently before phase mixing.

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