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arXiv 1306.1260physics.plasm-phhep-ph
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强laser脉冲作用下高能电子、正电子和光子相互作用的电磁级联

Electromagnetic cascade in high energy electron, positron, and photon interactions with intense laser pulses

S. S. Bulanov, C. B. Schroeder, E. Esarey, W. P. Leemans

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13 pages, 7 figures
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摘要：

研究了高能电子、正电子和光子与强激光脉冲的正面碰撞几何相互作用。它示出，电子和/或正电子经历级联型过程，涉及多个发射的光子。这些光子因此可以转换成电子-正电子对。结果，带电粒子迅速失去它们的能量，形成指数衰减的能量分布，这抑制了高能光子的发射，从而减少了产生的电子-正电子对的数量。因此，这种类型的相互作用抑制了电磁雪崩型放电的发展，即，在相互作用过程中，电子、正电子和光子的数量不会发生指数增长。当在横向粒子轨道中可以忽略3D效应时，即，对于具有不太极端的强度的足够宽的激光脉冲。计算了高能电子束与逆流短强激光脉冲相互作用时电子、正电子和光子的最终分布。电子束的能量损失，这需要一个自洽的量子描述，在这个过程中起着重要的作用，以及提供了一个明确的实验观察的相互作用从经典到量子制度的过渡。

英文摘要：

The interaction of high energy electrons, positrons, and photons with intense laser pulses is studied in head-on collision geometry. It is shown that electrons and/or positrons undergo a cascade-type process involving multiple emissions of photons. These photons can consequently convert into electron-positron pairs. As a result charged particles quickly lose their energy developing an exponentially decaying energy distribution, which suppresses the emission of high energy photons, thus reducing the number of electron-positron pairs being generated. Therefore, this type of interaction suppresses the development of the electromagnetic avalanche-type discharge, i.e., the exponential growth of the number of electrons, positrons, and photons does not occur in the course of interaction. The suppression will occur when 3D effects can be neglected in the transverse particle orbits, i.e., for sufficiently broad laser pulses with intensities that are not too extreme. The final distributions of electrons, positrons, and photons are calculated for the case of a high energy e-beam interacting with a counter-streaming, short intense laser pulse. The energy loss of the e-beam, which requires a self-consistent quantum description, plays an important role in this process, as well as provides a clear experimental observable for the transition from the classical to quantum regime of interaction.

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