Stochasticity effects in quantum radiation reaction.
Stochasticity effects in quantum radiation reaction.
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DOI：
10.1103/physrevlett.111.054802
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发表时间：
2013-01
影响因子：
8.6
通讯作者：
Norman Neitz;A. Piazza
中科院分区：
文献类型：
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作者：
Norman Neitz;A. Piazza
当超相对论电子束与足够强的激光脉冲碰撞时，辐射反应效应可以强烈地改变束动力学。在经典电动力学领域，辐射反应对电子束具有有益的影响，因为它倾向于减少其能量扩散。在这里，我们表明，当量子效应变得重要时，辐射反应引起相反的效应;即，电子束的能量分布在与激光脉冲相互作用之后展开。我们确定了光子发射的内在随机性，这在量子制度成为实质性的这种相反的趋势的物理起源。我们的数值模拟表明，预测的随机性的影响，可以测量已经与目前可用的激光器和电子加速器。
When an ultrarelativistic electron beam collides with a sufficiently intense laser pulse, radiation-reaction effects can strongly alter the beam dynamics. In the realm of classical electrodynamics, radiation reaction has a beneficial effect on the electron beam as it tends to reduce its energy spread. Here we show that when quantum effects become important, radiation reaction induces the opposite effect; i.e., the energy distribution of the electron beam spreads out after interacting with the laser pulse. We identify the physical origin of this opposite tendency in the intrinsic stochasticity of photon emission, which becomes substantial in the quantum regime. Our numerical simulations indicate that the predicted effects of the stochasticity can be measured already with presently available lasers and electron accelerators.