内爆初级质子能谱直接测量方法  

Directly measuring DD-produced proton spectra in ICF implosion

作　　者：伍波[1,2] 苏明[1] 滕建[1,2] 张天奎[1] 蒲昱东[1] 单连强[1,2] 朱斌[1,2] 谷渝秋[1,2] 洪伟[1,2] 

机构地区：[1]中国工程物理研究院激光聚变研究中心,四川绵阳621900 [2]等离子体物理重点实验室,四川绵阳621900

出　　处：《强激光与粒子束》2014年第12期101-104,共4页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(11175165);等离子体物理重点实验室基金项目(9140C680302130c68243)

摘　　要：基于单能质子对CR39的标定实验,利用获取的响应曲线,设计了一种内爆初级质子的直接测量方法.在内爆初级质子产额较低的情况下,该方法可获得更多的计数.对实验中的噪声信号排除做出了说明,并对其背景噪声来源进行了分析,以提高实验数据的精确性.利用标定数据,对CR39上观察到的径迹进行鉴别,确定质子径迹并测量其径迹参数,从而确定质子能量.在随机扫描的约300个显微镜视场中获得了200个质子径迹数据,并通过与标定数据比对,获得了它们各自的能量,再利用蒙特卡罗程序Geant4修正铝膜的岐离,最终确认本次内爆实验初级质子的能谱峰值应该在2.4～2.6MeV之间,据此换算到靶丸面密度为7～8mg/cm^2,为实验结果的进一步后续分析提供了依据.A method to directly measure the DDproduced proton spectra is proposed and applied to an ICF implosion experi ment. This method is based on the CR39 responding curve. It is designed to get higher counts, and it is suitable for low proton yield cases. Before the experiment, CR39 is calibrated and the background is measured to increase the accuracy. After the experi ment,the CR39 responding curve is used to clarify the primary proton energy, and the Geant4 is used to modified the membrane effect. The implosion areal density which is propitious to further analyze implosion experiment results is obtained by measuring the proton spectrum peak shift.

关 键 词：内爆压缩面密度 CR39标定 质子径迹 质子能谱下移 

分 类 号：O571.1[理学—粒子物理与原子核物理]