Zhidkov A, Koga J, Sasaki A, Uesaka M
Nuclear Engineering Research Laboratory, Graduate School of Engineering, The University of Tokyo, 22-2 Shirane-shirakata, Tokai, Naka, Ibaraki 319-1188, Japan.
Phys Rev Lett. 2002 May 6;88(18):185002. doi: 10.1103/PhysRevLett.88.185002. Epub 2002 Apr 19.
A strong effect of radiation damping on the interaction of an ultraintense laser pulse with an overdense plasma slab is found and studied via a relativistic particle-in-cell simulation including ionization. Hot electrons generated by the irradiation of a laser pulse with a radiance of I lambda(2)>10(22) W microm(2)/cm(2) and duration of 20 fs can convert more than 35% of the laser energy to radiation. This incoherent x-ray emission lasts for only the pulse duration and can be intense. The radiation efficiency is shown to increase nonlinearly with laser intensity. Similar to cyclotron radiation, the radiation damping may restrain the maximal energy of relativistic electrons in ultraintense-laser-produced plasmas.
通过包含电离的相对论性粒子模拟，发现并研究了辐射阻尼对超强激光脉冲与过密等离子体平板相互作用的强烈影响。由辐射亮度为(I\lambda^{2}>10^{22}) (W\ \mu m^{2}/cm^{2}) 且持续时间为(20)飞秒的激光脉冲照射产生的热电子可将超过(35%)的激光能量转化为辐射。这种非相干X射线发射仅持续脉冲持续时间且可能很强。辐射效率显示出随激光强度非线性增加。与回旋辐射类似，辐射阻尼可能会限制超强激光产生的等离子体中相对论电子的最大能量。
