- 必威体育下载

姓名
邮箱
手机号码
标题
留言内容
验证码

摘要

在直接驱动激光聚变研究中, 激光辐照靶丸会激励起受激布里渊散射(SBS)和交叉束能量传递(CBET)等过程, 降低激光与靶丸的能量耦合效率以及激光辐照均匀性, 导致靶丸内爆品质下降. 本文使用一套基于光纤收集信号的背向散射诊断系统, 诊断了双锥对撞点火(DCI)实验中波长在351 nm附近的时间分辨背向散射光谱. 通过对比不同激光辐照条件下散射光谱的特征, 结合光谱强度与入射激光能量以及激光偏振态的相关性分析, 确认背向散射信号中包含了分别来自CBET和背向SBS过程的散射成分, 确认镜像激光束之间的偏振夹角对CBET的影响. 实验结果表明, 在当前DCI实验中, 在351 nm附近的背向反射率不高于3%, 显著低于球对称辐照直接驱动中心点火方案的实验结果.

关键词:

Abstract

In the research of direct-drive laser fusion, laser irradiation of a target pellet can stimulate various laser plasma instabilities, such as stimulated Brillouin scattering (SBS) and cross-beam energy transfer (CBET), which significantly reduce the energy coupling efficiency between the laser and target pellet as well as the laser irradiation uniformity, leading the implosion quality to degrade. In the double-cone ignition (DCI) scheme of laser fusion scheme, the diagnosis of SBS and CBET is important owing to the different target configurations and oblique incident laser irradiation from the traditional spherically symmetric direct-drive central ignition scheme. In this paper, a simple and reliable backscattering diagnostic system is developed and applied to the diagnosis of the time-resolved backscattering spectrum at wavelength near 351 nm in a DCI experiment on the Shenguang-II upgrade (SG-IIU) facility. We use the system to carry out an experimental study of the SBS process and CBET process in DCI. The backscattering diagnostic system collects the backscattered light signal through the scattered light by reflector mirror via an optical fiber. The signal is dispersed by a spectrometer and then recorded by a streak camera. The signal contains both the laser reference signal from the frequency doubling crystal and the backscattered light. With the help of the reference signal, the diagnostic system can reliably give the energy fraction of backscattered light. The experimental results show that the energy fraction of backscattered light around 351 nm is not higher than 3%, which is significantly lower than the experimental result of the spherically symmetric irradiation direct-drive central ignition scheme. By analyzing the correlation between the backscattered signal and the laser irradiation conditions and combining the results of a set of comparative experiments, we determine that the backscattered signal contains both CBET and SBS. There is a significant difference in the CBET fraction between the backscattered signal of the #5 laser and the backscattered signal of the #7 laser. By combining the polarisation state of the laser beams, we confirm that this phenomenon is related to the polarisation angle between the laser beams. This finding provides a reference for designing subsequent large-scale laser fusion devices.

Keywords:

double-cone ignition scheme/
cross beam energy transfer/
backward stimulated Brillouin scattering

作者及机构信息

1.
2.
3.
4.
5.

通信作者:袁鹏,yuanpeng@ustc.edu.cn

基金项目:中国科学院战略性先导科技专项(A类)(批准号: XDA25010200)资助的课题.

Authors and contacts

1.
2.
3.
4.
5.

Corresponding author:Yuan Peng,yuanpeng@ustc.edu.cn

Funds:Project supported by the Strategic Priority Research Program (A) of the Chinese Academy of Sciences (Grant No. XDA25010200).

文章全文: translate this paragraph

参考文献

[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]
[10]
[11]
[12]
[13]
[14]
[15]
[16]
[17]
[18]
[19]
[20]
[21]
[22]
[23]
[24]
[25]
[26]
[27]
[28]

施引文献

下载: 全尺寸图片幻灯片

诊断窗口	靶型	激光入射角/(°)	偏振方向
诊断窗口	靶型	激光入射角/(°)	与入射面夹角/(°)	与靶面法向夹角/(°)	与镜像光束偏振夹角/(°)	反射光与镜像光束偏振夹角/(°)
#5背散 (#3镜面反射方向)	双锥靶	50	7.5	40.6	81.2	15
#7背散 (#1镜面反射方向)	双锥靶	50	23	45.2	89.7	46

下载: 导出CSV

[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]
[10]
[11]
[12]
[13]
[14]
[15]
[16]
[17]
[18]
[19]
[20]
[21]
[22]
[23]
[24]
[25]
[26]
[27]
[28]

[1]	张喆, 远晓辉, 张翌航, 刘浩, 方可, 张成龙, 刘正东, 赵旭, 董全力, 刘高扬, 戴羽, 谷昊琛, 李玉同, 郑坚, 仲佳勇, 张杰.超音速高密度喷流对撞过程中的高效能量转移. 必威体育下载 , 2022, 71(15): 155201.doi:10.7498/aps.71.20220361
[2]	王琛, 安红海, 熊俊, 方智恒, 季雨, 练昌旺, 谢志勇, 郭尔夫, 贺芝宇, 曹兆栋, 王伟, 闫锐, 裴文兵.皮秒激光驱动下的背向受激布里渊散射的光谱结构. 必威体育下载 , 2021, 70(19): 195202.doi:10.7498/aps.70.20210568
[3]	许锦, 郭洋宁, 罗宁宁, 李淑静, 史久林, 何兴道.水体参数对受激布里渊散射阈值及增益的影响. 必威体育下载 , 2021, 70(15): 154205.doi:10.7498/aps.70.20210326
[4]	史久林, 许锦, 罗宁宁, 王庆, 张余宝, 张巍巍, 何兴道.水中受激拉曼散射的能量增强及受激布里渊散射的光学抑制. 必威体育下载 , 2019, 68(4): 044201.doi:10.7498/aps.68.20181548
[5]	刘雅坤, 王小林, 粟荣涛, 马鹏飞, 张汉伟, 周朴, 司磊.相位调制信号对窄线宽光纤放大器线宽特性和受激布里渊散射阈值的影响. 必威体育下载 , 2017, 66(23): 234203.doi:10.7498/aps.66.234203
[6]	哈斯乌力吉, 王雪阳, 郭翔宇, 仲召明, 范瑞清, 林殿阳, 何伟明, 吕志伟.杂质颗粒对受激布里渊散射介质光学击穿阈值影响的研究. 必威体育下载 , 2012, 61(14): 144207.doi:10.7498/aps.61.144207
[7]	袁强, 魏晓峰, 张小民, 张鑫, 赵军普, 黄文会, 胡东霞.基于受激布里渊散射能量转移的冲击点火激光技术研究. 必威体育下载 , 2012, 61(11): 114207.doi:10.7498/aps.61.114207
[8]	耿西钊, 哈斯乌力吉, 郭翔宇, 李杏, 林殿阳, 何伟明, 范瑞清, 吕志伟.利用受激布里渊散射能量反射率测量液体介质运动黏度方法的研究. 必威体育下载 , 2011, 60(5): 054208.doi:10.7498/aps.60.054208
[9]	何兴道, 夏健, 史久林, 刘娟, 李淑静, 刘建安, 方伟.水的衰减系数及有效增益长度对受激布里渊散射输出能量的影响. 必威体育下载 , 2011, 60(5): 054207.doi:10.7498/aps.60.054207
[10]	陈旭东, 石锦卫, 刘娟, 刘宝, 许艳霞, 史久林, 刘大禾.同轴正交偏振双脉冲序列受激布里渊散射抽运放大的实现方法. 必威体育下载 , 2010, 59(2): 1047-1051.doi:10.7498/aps.59.1047
[11]	王士鹤, 任立勇, 刘宇.光纤中基于双宽带抽运的受激布里渊散射增益谱展宽及慢光传输中脉冲失真减小的理论研究. 必威体育下载 , 2009, 58(6): 3943-3948.doi:10.7498/aps.58.3943
[12]	刘娟, 白建辉, 倪恺, 景红梅, 何兴道, 刘大禾.受激布里渊散射对激光在水中衰减特性的影响. 必威体育下载 , 2008, 57(1): 260-264.doi:10.7498/aps.57.260
[13]	哈斯乌力吉, 吕志伟, 李强, 巴德欣, 何伟明.选用新介质的双池受激布里渊散射系统的研究. 必威体育下载 , 2007, 56(3): 1385-1389.doi:10.7498/aps.56.1385
[14]	王雨雷, 吕志伟, 何伟明, 张祎.一种大能量受激布里渊散射相位共轭镜的研究. 必威体育下载 , 2007, 56(2): 883-888.doi:10.7498/aps.56.883
[15]	龚华平, 吕志伟, 林殿阳, 吕月兰.透镜焦距对受激布里渊散射光限幅特性的影响. 必威体育下载 , 2006, 55(6): 2735-2739.doi:10.7498/aps.55.2735
[16]	邓少永, 郭少锋, 陆启生, 程湘爱.抽运光参数对受激布里渊散射的影响. 必威体育下载 , 2005, 54(7): 3164-3172.doi:10.7498/aps.54.3164
[17]	哈斯乌力吉, 吕志伟, 何伟明, 李强, 巴德欣.光学击穿对受激布里渊散射特性的影响. 必威体育下载 , 2005, 54(12): 5654-5658.doi:10.7498/aps.54.5654
[18]	何伟明, 杨　珺, 吕月兰, 吕志伟.种子场对单池受激布里渊散射脉冲波形保真的影响. 必威体育下载 , 2004, 53(2): 468-472.doi:10.7498/aps.53.468
[19]	彭忠林, 朱少平.碰撞对受激Raman散射的影响. 必威体育下载 , 2003, 52(10): 2500-2507.doi:10.7498/aps.52.2500
[20]	沈文达, 朱莳通.库仑相互作用对相对论性电子束受激散射的影响. 必威体育下载 , 1982, 31(2): 234-236.doi:10.7498/aps.31.234

计量

文章访问数:2458
PDF下载量:90
被引次数:0

搜索

留言板