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为了探索飞秒脉冲激光与固体靶相互作用中医用质子束特性,在超短超强激光装置“SILEX-I”上进行了医用高能质子束特性实验研究。实验利用HD810辐射变色膜片(RCF)、CR39核径迹探测器和Thomson离子谱仪分别在固体靶背表面法线方向测量了质子束的空间分布、束密度、产额和能谱。实验结果表明:质子束沿着靶背法线方向发射,与入射激光方向无关;质子束空间分布呈现环状、成丝和圆盘状分布,并且质子束存在较小的发射立体角;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;质子束发射在一定能量处出现截止,截止能量的大小与靶厚度有关,即随靶厚度的增加而减小。
In order to explore the characteristics of Chinese medical proton beam in the interaction between femtosecond pulsed laser and solid target, the experimental study on the characteristics of medical high-energy proton beam in the ultra-short super laser device “SILEX-I” was carried out. The spatial distribution, beam density, yield and energy spectrum of the proton beam were measured in the normal direction of the solid target back surface using the HD810 Radial Discoloration Membrane (RCF), CR39 Nuclear Track Detector and Thomson Ion Spectrometer. The experimental results show that the proton beam emits along the normal direction of the target, regardless of the direction of the incident laser beam. The spatial distribution of the proton beam presents a ring, filament and disk distribution, and the proton beam has a small emission solid angle. The proton beam current decreases with the increase of the C8H8 layer thickness on the back surface. The proton beam emission ends at a certain energy. The size of the cutoff energy is related to the target thickness, ie, Increase and decrease.