神光Ⅱ升级装置激光加速质子照相初步实验研究

发布时间：2018-01-11 16:28

本文关键词：神光Ⅱ升级装置激光加速质子照相初步实验研究　出处：《强激光与粒子束》2017年09期 　论文类型：期刊论文

【摘要】：在神光Ⅱ升级装置上开展了首轮激光加速质子对间接驱动快点火靶内爆过程的照相实验研究。通过激光与靶参数的优化,获得了能量高于18MeV的质子束。通过静态客体的照相,获得了优于20μm的高空间分辨网格图像,为开展时间分辨的啁啾质子照相奠定了基础。开展了质子动态照相实验,获得了内爆压缩晚期的质子照相图像。实验发现内爆区域质子照相图像存在大量排空现象。内爆压缩区域不足以阻挡如此大范围质子束,证明了其中存在电磁场使得质子向外排开。动态照相的质子能量较低,分析是ns激光打靶过程产生的X射线及等离子体对质子加速存在影响。后续实验中需要进一步优化靶的屏蔽设计。
[Abstract]:In the Shenguang II upgrade device carried out the first round of experimental study of laser accelerated proton photographic indirect drive explosion process of fast ignition target. By optimizing the laser and target parameters, the proton beam energy is higher than that of 18MeV. Through the static object photography, obtained better than 20 m high resolution between the grid image, which the basis for development of time-resolved chirp proton radiography was carried out. The experimental proton dynamic photography, implosion proton radiography image compression. The experimental results showed that the late implosion region of proton radiography image vacuation. There are a lot of implosion region was not enough to stop such a large range of proton beam, which proves that electromagnetic field makes proton outward lined. Dynamic camera proton energy is low, analysis of X ray produced ns laser plasma acceleration process and the influence of the proton. The subsequent experiment needs further optimization Shielding design of the target.

【作者单位】：中国工程物理研究院激光聚变研究中心等离子体物理重点实验室;
【基金】：中国工程物理研究院科学技术发展基金项目(2013A0103003) 科技部重大科学仪器设备开发专项(2012YQ03014206)
【分类号】：TN24
【正文快照】： 在间接驱动ICF研究中,黑腔内电磁场的存在对激光能量的转换以及靶丸压缩都有重要的影响[1-3]。传统X射线成像技术在诊断间接驱动ICF内爆动力学方面发挥了重要作用,但不能提供其中电磁场结构信息。作为一种带电粒子束,质子在诊断电磁场方面具有其独特的优势,可以实现ICF相关电

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