Reaching supercritical field strengths with intense lasers
Reaching supercritical field strengths with intense lasers
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DOI：
10.1088/1367-2630/ab1e0d
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发表时间：
2018-07
影响因子：
3.3
通讯作者：
T. Blackburn;A. Ilderton;M. Marklund;Christopher Ridgers
中科院分区：
文献类型：
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作者：
T. Blackburn;A. Ilderton;M. Marklund;Christopher Ridgers
本文指出，当强激光场被提升到远大于量子电动力学临界场的“超临界”强度时，高能电子束与强激光的碰撞将使量子电动力学（QED）的所有微扰方法失效。随着电场强度向这一方向的增加，预计会产生光子发射和电子-正电子对的级联，以及大量辐射修正的开始。在这里，我们确定的碰撞角在减轻能量损失的光子发射，否则将阻止电子达到超临界状态所发挥的重要作用。我们发现，一个能量在几十GeV的电子束和一个强度为10 24 W cm-2的激光脉冲之间的碰撞，在斜入射，甚至垂直入射，是一个可行的平台，用于研究微扰强场QED的击穿。我们的研究结果对近期实验的设计有影响，因为它们预测某些量子效应在斜入射时会增强。
It is conjectured that all perturbative approaches to quantum electrodynamics (QED) break down in the collision of a high-energy electron beam with an intense laser, when the laser fields are boosted to ‘supercritical’ strengths far greater than the critical field of QED. As field strengths increase toward this regime, cascades of photon emission and electron–positron pair creation are expected, as well as the onset of substantial radiative corrections. Here we identify the important role played by the collision angle in mitigating energy losses to photon emission that would otherwise prevent the electrons reaching the supercritical regime. We show that a collision between an electron beam with energy in the tens of GeV and a laser pulse of intensity 10 24 W cm − 2 at oblique, or even normal, incidence is a viable platform for studying the breakdown of perturbative strong-field QED. Our results have implications for the design of near-term experiments as they predict that certain quantum effects are enhanced at oblique incidence.