关键词: 
超短超强激光 /
质子 /
质子空间分布 /
质子产额 /
辐射变色膜片

摘要: 在SILEX-I激光装置上实验研究了超强超短激光与Au/CH复合靶相互作用中在靶背法线方向发射的质子束的空间分布特征。 保持复合靶前表面的Au厚度不变，质子束流随着后表面的C8H8层厚度的增加而减小， 同时质子空间分布呈现环状、成丝和圆盘状分布。 实验没有发现高于2.75 MeV的高能质子产生。实验进一步完善了超短超强激光等离子体相互作用的物理模型。Proton beam behavior at the normal direction of the rear surface of the target produced from ultraintense short pulse laser irradiated Au/CH double layers targets was explored on SILEXI laser facility. With the same thickness of Au layer，the proton beam flux decreases with the increasing of CH layer thickness，and the corresponding spatial profile of proton beam shows ring， filament，and disc like distribution. The energy of proton beam was not beyond 2.75 MeV in our experiment.