基于SiC材料的激光加速质子束辐照特性研究  

Study on the Irradiation Characteristics of Laser-Accelerated Proton Beam on SiC

作　　者：周丹晴 李东彧 陈艺 李越 杨童 程浩 吴旻剑 李昱泽 晏炀 夏亚东 林晨[1] 颜学庆[1] 赵子强[1] ZHOU Danqing;LI Dongyu;CHEN Yi;LI Yue;YANG Tong;CHENG Hao;WU Minjian;LI Yuze;YAN Yang;XIA Yadong;LIN Chen;YAN Xueqing;ZHAO Ziqiang(State Key Lab of Nuclear Physics and Technology,Peking University,Beijing 100871)

机构地区：[1]北京大学核物理与核技术国家重点实验室,北京100871

出　　处：《北京大学学报（自然科学版）》2022年第3期405-411,共7页Acta Scientiarum Naturalium Universitatis Pekinensis

基　　金：国家自然科学基金(11875077)资助。

摘　　要：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。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 laser-accelerated 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 simu-lated reactor neutron irradiation.

关 键 词：激光加速质子束 SIC 宽能谱 拉曼截面测量 短脉冲 

分 类 号：TN249[电子电信—物理电子学] TQ127.2[化学工程—无机化工]