强激光与粒子束, 2015, 27 (3): 032017, 网络出版: 2015-03-23
间接驱动快点火锥壳靶锥体材料燃料混合问题研究
Material mixing of cone-in-shell targets for indirect-drive fast ignition
快点火 间接驱动 激光聚变 锥壳靶 燃料混合 fast ignition indirect drive laser fusion cone-in-shell target material mixing
摘要
与中心点火相比, 快点火将压缩和点火过程分开, 大大放宽了对压缩对称性和驱动能量的要求。通过在神光Ⅱ激光装置上开展了快点火锥壳靶预压缩实验研究, 利用X射线背光分幅照相方法观察到了清晰完整的快点火锥壳靶内爆压缩过程, 并利用阿贝反演结合剩余烧蚀质量的方法得到了不同时刻燃料密度、面密度分布数据, 当前实验条件下获得的最大压缩密度和面密度分别为30 g/cm3和50 mg/cm2; 为解决金柱腔M带对导引锥的预热以及由此导致的燃料-锥体材料混合问题, 提出了一种在锥体表面镀低Z材料的方法, 实验和辐射流体数值模拟结果验证了该方法的有效性, 该方法的成功解决了间接驱动快点火激光聚变的重要关键技术问题。
Abstract
Compared with central ignition of laser fusion, fast ignition separates compression and ignition thus it can relax the requirements for the implosion symmetry and the driven energy. Indirect drive pre-compression of cone-in-shell target for fast ignition was performed on Shenguang Ⅱ laser facility. The temporal evolution of the target was observed by the X-ray backlight framed camera. The density and areal density of the compressed fuel which were obtained from the backlight figures are 30 g/cm3 and 50 mg/cm2 separately. To minimize the mixing of the compressed fuel and cone high-Z vapor produced by the M-line emission from the gold holhraum, a CH foil was coated on the full outer surface of the cone. Experimental results and simulation results demonstrated that the coated CH foil could minimize the mixing effectively.
周维民, 单连强, 吴俊峰, 蔡洪波, 刘东晓, 刘红杰, 毕碧, 张锋, 王为武, 吴凤娟, 朱斌, 吴玉迟, 温贤伦, 何颖玲, 周沧涛, 曹莉华, 吴思忠, 魏来, 曹柱荣, 袁铮, 杨志文, 谷渝秋, 张保汉. 间接驱动快点火锥壳靶锥体材料燃料混合问题研究[J]. 强激光与粒子束, 2015, 27(3): 032017. Zhou Weimin, Shan Lianqiang, Wu Junfeng, Cai Hongbo, Liu Dongxiao, Liu Hongjie, Bi Bi, Zhang Feng, Wang Weiwu, Wu Fengjuan, Zhu Bin, Wu Yuchi, Wen Xianlun, He Yinglin, Zhou Cangtao, Cao Lihua, Wu Sizhong, Wei Lai, Cao Zhurong, Yuan Zheng, Yang Zhiwen, Gu Yuqiu, Zhang Baohan. Material mixing of cone-in-shell targets for indirect-drive fast ignition[J]. High Power Laser and Particle Beams, 2015, 27(3): 032017.