Experimental Evidence of Radiation Reaction in the Collision of a High-Intensity Laser Pulse with a Laser-Wakefield Accelerated Electron Beam
Experimental Evidence of Radiation Reaction in the Collision of a High-Intensity Laser Pulse with a Laser-Wakefield Accelerated Electron Beam
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DOI：
10.1103/physrevx.8.011020
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发表时间：
2018-02-07
影响因子：
12.5
通讯作者：
Mangles, S. P. D.
中科院分区：
文献类型：
--
作者：
Cole, J. M.;Behm, K. T.;Mangles, S. P. D.
高能粒子在强电磁场中的动力学受到加速过程中辐射发射所产生的能量损失的严重影响，称为辐射反应。当与高能电子束相互作用时，今天的激光有足够的强度来探索经典和量子辐射反应体制之间的转变。我们提出了由激光尾场加速（epsilon > 500 MeV）产生的超相对论电子束与强激光脉冲（a(0) >10）碰撞时的辐射反应的证据。我们测量了碰撞后电子能谱中的能量损失，这与检测到的硬光子（伽马射线）信号相关，与辐射反应的量子描述一致。所产生的伽马射线具有迄今为止报道的全光学逆康普顿散射方案的最高能量，临界能量为epsilon（临界）bbb30 MeV。
The dynamics of energetic particles in strong electromagnetic fields can be heavily influenced by the energy loss arising from the emission of radiation during acceleration, known as radiation reaction. When interacting with a high-energy electron beam, today's lasers are sufficiently intense to explore the transition between the classical and quantum radiation reaction regimes. We present evidence of radiation reaction in the collision of an ultrarelativistic electron beam generated by laser-wakefield acceleration (epsilon > 500 MeV) with an intense laser pulse (a(0) > 10). We measure an energy loss in the postcollision electron spectrum that is correlated with the detected signal of hard photons (gamma rays), consistent with a quantum description of radiation reaction. The generated gamma rays have the highest energies yet reported from an all-optical inverse Compton scattering scheme, with critical energy epsilon(crit) > 30 MeV.