Relativistic Quasimonoenergetic Positron Jets from Intense Laser-Solid Interactions
Relativistic Quasimonoenergetic Positron Jets from Intense Laser-Solid Interactions
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DOI：
10.1103/physrevlett.105.015003
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发表时间：
2010-07-01
影响因子：
8.6
通讯作者：
Beiersdorfer, P.
中科院分区：
文献类型：
--
作者：
Chen, Hui;Wilks, S. C.;Beiersdorfer, P.
详细的角度和能量分辨测量的正电子从后面的金靶，是用强烈的皮秒持续时间的激光脉冲照射的弹出揭示了正电子在一个准直的相对论射流。激光-正电子能量转换效率约为2 × 10 ~（-4）。射流具有类似于20度的角发散，能量分布是准单能的，能量为4至20 MeV，束流温度类似于1 MeV。靶表面的鞘层电场被用来确定正电子能量。通过改变鞘场，通过激光条件和靶几何形状来控制正电子角和能量分布。
Detailed angle and energy resolved measurements of positrons ejected from the back of a gold target that was irradiated with an intense picosecond duration laser pulse reveal that the positrons are ejected in a collimated relativistic jet. The laser-positron energy conversion efficiency is similar to 2 X 10(-4). The jets have similar to 20 degree angular divergence and the energy distributions are quasimonoenergetic with energy of 4 to 20 MeV and a beam temperature of similar to 1 MeV. The sheath electric field on the surface of the target is shown to determine the positron energy. The positron angular and energy distribution is controlled by varying the sheath field, through the laser conditions and target geometry.