University Bordeaux-CNRS-CEA, CELIA, UMR 5107, F-33400 Talence, France.
Phys Rev Lett. 2013 May 24;110(21):215003. doi: 10.1103/PhysRevLett.110.215003. Epub 2013 May 21.
The role of ions in the energy absorption of a short and ultraintense laser pulse and in the synchrotron radiation generated by accelerated electrons is revisited. For laser intensities above 10(22) W/cm(2) and plasma densities more than 10 times the critical density, the ion-to-electron mass ratio strongly affects the energy repartition between the electrons, ions, and radiation. This phenomenon is studied with a one-dimensional relativistic particle-in-cell code, taking into account the radiation reaction force. The choice of the ion mass strongly affects the energy and angular distribution of the photon emission and the electron energy distribution. This effect may be important for laboratory modeling of radiation dominated relativistic astrophysical events. It can be verified in experiments with solid hydrogen targets.
重新探讨了离子在短脉冲超强激光能量吸收以及加速电子同步辐射中的作用。对于强度高于 10(22)W/cm(2)和等离子体密度超过临界密度 10 倍的激光，离子与电子的质量比强烈影响电子、离子和辐射之间的能量分配。利用考虑辐射反作用力的一维相对论粒子模拟程序研究了这一现象。离子质量的选择强烈影响光子发射的能量和角分布以及电子能量分布。这种效应对于实验室模拟辐射主导的相对论天体物理事件可能很重要。它可以在固体氘化氢靶实验中得到验证。
