神光-Ⅲ主机内爆柱腔靶长径比对靶丸辐照不均匀度的影响  

Effects of length-to-diameter ratio of cylindrical hohlraum on irradiation nonuniformity of capsule on Shenguang-Ⅲ facility

作　　者：景龙飞[1] 黄天晅[1] 陈伯伦[1] 苏明[1] 余波[1] 蒋炜[1] 蒲昱东[1] 晏骥[1] 

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

出　　处：《强激光与粒子束》2011年第9期2409-2414,共6页High Power Laser and Particle Beams

基　　金：高温高密度等离子体物理国防科技重点实验室基金项目(9140C6801021002)

摘　　要：讨论了神光-Ⅲ主机内爆柱腔靶长径比(腔长与直径之比)对靶丸辐照不均匀度的影响。根据神光-Ⅲ主机设计参数,计算了黑腔内侧激光光斑参数。利用视角因子方法,分析了一个简化的双锥环辐照模型下靶丸表面辐照不均匀度随黑腔长径比的变化,讨论了腔壁反照率、内外环激光功率比和光斑移动等因素对最佳长径比和不均匀度的影响。计算表明,合理选择长径比能使靶丸表面辐照不均匀度小于1%,最佳长径比与NIF点火黑腔设计值基本相符。The paper discusses the effects of length-to-diameter ratio of cylindrical hohlraum on irradiation nonuniformity of capsule on Shenguang-Ⅲ facility.The parameters of laser spots on hohlraum＇s inner wall are calculated according to the parameters of Shenguang-Ⅲ facility.The variation of irradiation nonuniformity with the length-to-diameter ratio is analyzed with view factor method for a simplified dual-core irradiation model,and the variations of the best length-to-diameter ratio and irradiation nonuniformity with the albedo of hohlraum＇s inner wall,power ratio between inner and outer cones and motion of laser spots are also discussed.The calculation results show that the root-mean-square nonuniformity of irradiation is less than 1% at the best length-to-diameter ratio,which agrees with the ratio of the hohlraum designed for ignition on the National Ignition Facility.

关 键 词：间接驱动 辐射驱动对称性 视角因子 长径比 

分 类 号：TL632.1[核科学技术—核技术及应用]