By irradiating the nuclear material SiC, the characteristics of continuous wide energy spectrum, short pulse and high instantaneous current intensity of the laser-accelerated proton beam have been characterized. The SiC samples were placed at a distance of 4 cm from the target. The 300 shots proton beams were irradiated with a continuous wide energy spectrum proton beam of 1–4.5 MeV, which satisfied the exponential energy spectrum distribution. The surface and cross-section Raman characterizations showed that the intensity of the SiC scattering peaks after irradiation were reduced. The overall trend of Raman cross-section measurement was consistent with the depth of the distribution of energy loss by SRIM simulation. Thus, the experimental characterization of laseraccelerated proton beam with continuous energy distribution was realized. In addition, experiments showed that the short pulse characteristic of the laser-accelerated proton beam could produce a relatively high instantaneous beam current density on the SiC surface. The ultra-fast wide energy spectrum irradiation provides a possibility in simulated reactor neutron irradiation.

通过辐照核能材料SiC, 表征激光加速质子束连续宽能谱、短脉冲和高瞬态流强的特点。将SiC样品放置在距离靶体4 cm处, 连续进行300发满足指数能谱分布的能量为1~4.5 MeV的激光加速宽能谱连续质子束辐照。表面和截面拉曼光谱显示辐照后的SiC散射峰强度减小, 且拉曼光谱截面测量的整体趋势可以与SRIM模拟的能谱加权后的深度能损分布对应, 从而通过实验对能量连续分布的激光加速质子束进行表征。此外, 实验结果显示, 激光加速质子束的短脉冲特性可在SiC表面产生相当高的瞬时束流密度。这种快速的宽能谱辐照为模拟反应堆中子辐照提供了可能性。