Laser Absorption in Relativistically Underdense Plasmas by Synchrotron Radiation
Laser Absorption in Relativistically Underdense Plasmas by Synchrotron Radiation
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DOI：
10.1103/physrevlett.109.245006
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发表时间：
2012-12-14
影响因子：
8.6
通讯作者：
Kirk, J. G.
中科院分区：
文献类型：
--
作者：
Brady, C. S.;Ridgers, C. P.;Kirk, J. G.
提出了线偏振激光在超相对论性（近似于100）弱密度固体中传播的一种新的吸收机制。该机制是基于电子在激光脉冲前产生的空间电荷场将电子重新注入激光而产生的强同步辐射。这种激光吸收，称为再注入电子同步加速器发射，是由于在低密度固体中，在强度高于10(22)W/cm(2)的情况下，传统等离子体物理过程与量子电动力学过程的耦合。在二维qed粒子胞内模拟中确定了再注入电子同步辐射，然后用一维qed粒子胞内模拟和简单解析理论解释了再注入电子同步辐射。研究发现，在1%(在10（22)W/cm(2)）和14%(在8 × 10（23) W/cm(2)）之间的激光能量转化为伽马射线光子，有可能提供未来超强的伽马射线源。DOI: 10.1103 / PhysRevLett.109.245006
A novel absorption mechanism for linearly polarized lasers propagating in relativistically underdense solids in the ultrarelativistic (a similar to 100) regime is presented. The mechanism is based on strong synchrotron emission from electrons reinjected into the laser by the space charge field they generate at the front of the laser pulse. This laser absorption, termed reinjected electron synchrotron emission, is due to a coupling of conventional plasma physics processes to quantum electrodynamic processes in low density solids at intensities above 10(22) W/cm(2). Reinjected electron synchrotron emission is identified in 2D QED-particle-in- cell simulations and then explained in terms of 1D QED-particle-in-cell simulations and simple analytical theory. It is found that between 1% (at 10(22) W/cm(2)) and 14% (at 8 x 10(23) W/cm(2)) of the laser energy is converted into gamma ray photons, potentially providing an ultraintense future gamma ray source. DOI: 10.1103/PhysRevLett.109.245006