检索结果-南通市图书馆

Experiments and analysis of gold disk targets irradiated by smoothing beams of Xingguang Ⅱ facilities with 350 nm wavelength

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2007年第6期50卷 716-730页

作者： JIANG ShaoEn,zhang baohan,LIU ShenYe,YANG JiaMin,SUN KeXu,HUANG TianXuan,DING YongKun & ZHENG ZhiJian National Key Laboratory of Laser Fusion,Laser Fusion Research Center,Mianyang 621900,China National Key Laboratory of Laser Fusion Laser Fusion Research Center Mianyang China

Gold disk targets were irradiated using focusing and beam smoothing methods on Xingguang (XG-Ⅱ) laser facilities with 350 nm wavelength,0.6 ns pulse width and 20-80 Joules energies. Laser absorption,light scattering and X-ray conversion were experimentally investigated. The experimental results showed that laser ab-sorption and scattered light were about 90% and 10%,respectively,under focusing irradiation,but the laser absorption increased 5%-10% and the scattered light about 1% under the condition of beam smoothing. Compared with the case of fo-cusing irradiation,the laser absorption was effectively improved and the scattered light remarkably dropped under uniform irradiation; then due to the decrease in laser intensity,X-ray conversion increased. This is highly advantageous to the in-ertial confinement fusion. However,X-ray conversion mechanism basically did not change and X-ray conversion efficiency under beam smoothing and focusing irra-diation was basically the same.

关键词： beam smoothing, lens array, laser absorption, scattered light, X-ray conversion Gold disk targets were irradiated using focusing and beam smoothing methods on Xingguang (XG-II) laser facilities with 350 nm wavelength, 0.6 ns pulse width and 20-80 Joules energies. Laser absorption, light scattering and X-ray conversion were experimentally investigated. The experimental results showed that laser absorption and scattered light were about 90% and 10%, respectively, under focusing irradiation, but the laser absorption increased 5%-10% and the scattered light about 1% under the condition of beam smoothing. Compared with the case of focusing irradiation, the laser absorption was effectively improved and the scattered light remarkably dropped under uniform irradiation then due to the decrease in laser intensity, X-ray conversion increased. This is highly advantageous to the inertial confinement fusion. However, X-ray conversion mechanism basically did not change and X-ray conversion efficiency under beam smoothing and focusing irradiation was basically the same.……

Proton radiography of magnetic fields generated with an open-ended coil driven by high power laser pulses

在线全文

学校读者我要写书评

暂无评论

Matter and Radiation at Extremes 2016年第4期1卷 187-191页

作者： Guoqian Liao Yutong Li Baojun Zhu Yanfei Li Fang Li Mengchao Li Xuan Wang Zhe zhang Shukai He Weiwu Wang Feng Lu Faqiang zhang Lei Yang Kainan Zhou Na Xie Wei Hong Yuqiu Gu Zongqing Zhao baohan zhang Jie zhang National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China Science and Technology on Plasma Physics Laboratory Laser Fusion Research CenterChina Academy of Engineering Physics(CAEP)Mianyang 621900China Key Laboratory for Laser Plasmas(MoE)and Department of Physics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center of IFSA(CICIFSA) Shanghai Jiao Tong UniversityShanghai 200240China

Recently generation of strong magnetic(B)fields has been demonstrated in capacitor coils heated by high power laser pulses[*** et al.,***.3,1170(2013)].This paper will present a direct measurement of B field generated with an open-ended coil target driven by a nanosecond laser pulse using ultrafast proton *** radiographs are analyzed with particle-tracing *** B field at the coil center is inferred to be ~50 T at an irradiance of ~5×10^(14) W·cm^(-2).The B field generation is attributed to the background cold electron flow pointing to the laser focal spot,where a target potential is induced due to the escape of energetic electrons.

关键词： Strong magnetic field Laser-driven coil targets Proton radiography

Recent diagnostic developments at the 100 kJ-level laser facility in China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Matter and Radiation at Extremes 2020年第3期5卷 1-10页

作者： Feng Wang Shaoen Jiang Yongkun Ding Shenye Liu Jiamin Yang Sanwei Li Tianxuan Huang Zhurong Cao Zhenghua Yang Xin Hu Wenyong Miao Jiyan zhang Zhebin Wang Guohong Yang Rongqing Yi Qi Tang Longyu Kuang Zhichao Li Dong Yang Yulong Li Xiaoshi Peng Kuan Ren baohan zhang Laser Fusion Research Center China Academy of Engineering PhysicsMianyangChina Institute of Applied Physics and Computational Mathematics China Academy of Engineering PhysicsBeijingChina

A 100 kJ-level laser facility has been designed to study inertial confinement fusion physics in *** facility incorporates various diagnostic techniques,including optical,x-ray imaging,x-ray spectrum,and fusion product diagnostics,as well as general diagnostics assistance systems and central control and data acquisition *** paper describes recent developments in diagnostics at the facility.

关键词： laser China. facility

Progress in optical Thomson scattering diagnostics for ICF gas-filled hohlraums

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Matter and Radiation at Extremes 2019年第5期4卷 28-37页

作者： Hang Zhao Zhichao Li Dong Yang Xin Li Yaohua Chen Xiaohua Jiang Yonggang Liu Tao Gong Liang Guo Sanwei Li Qi Li Feng Wang Shenye Liu Jiamin Yang Shaoen Jiang Wanguo Zheng baohan zhang Yongkun Ding Laser Fusion Research Center China Academy of Engineering PhysicsMianyang 621900China Tsinghua University Beijing 100084China Institute of Applied Physics and Computational Mathematics Beijing 100088China

Optical Thomson scattering(OTS)diagnostics have been continuously developed on a series of large laser facilities for inertial confinement fusion(ICF)research in *** review recent progress in the use of OTS diagnostics to study the internal plasma conditions of ICF gas-filled *** establish the predictive capability for experiments by calculating the time-resolved Thomson scattering spectra based on the 2D radiation-hydrodynamic code LARED,and we explore the fitting method for the measured spectra.A typical experiment with a simplified cylindrical hohlraum is conducted on a 10 kJ-level laser facility,and the plasma evolution around the laser entrance hole is *** dynamic effects of the blast wave from the covering membrane and the convergence of shocks on the hohlraum axis are observed,and the experimental results agree well with those of *** typical experiment with an octahedral spherical hohlraum is conducted on a 100 kJ-level laser facility,and the plasma evolution at the hohlraum center is analyzed.A discrepancy appears between experiment and simulation as the electron temperature rises,indicating the occurrence of nonlocal thermal conduction.

关键词： scattering filled Thomson

The effects of incident light wavelength difference on the collective stimulated Brillouin scattering in plasmas

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Matter and Radiation at Extremes 2023年第5期8卷 42-49页

作者： Qiang Wang Zhichao Li Zhanjun Liu Tao Gong Wenshuai zhang Tao Xu Bin Li Ping Li Xin Li Chunyang Zheng Lihua Cao Xincheng Liu Kaiqiang Pan Hang Zhao Yonggang Liu Bo Deng Lifei Hou Yingjie Li Xiangming Liu Yulong Li Xiaoshi Peng Zanyang Guan Qiangqiang Wang Xingsen Che Sanwei Li Qiang Yin Wei zhang Liqiong Xia Peng Wang Xiaohua Jiang Liang Guo Qi Li Minqing He Liang Hao Hongbo Cai Wudi Zheng Shiyang Zou Dong Yang Feng Wang Jiamin Yang baohan zhang Yongkun Ding Xiantu He Institute of Applied Physics and Computational Mathematics Beijing 100094China Laser Fusion Research Center China Academy of Engineering PhysicsMianyangSichuan 621900China HEDPS Center for Applied Physics and Technologyand College of EngineeringPeking UniversityBeijing 100871China

The first laser–plasma interaction experiment using lasers of eight beams grouped into one octad has been conducted on the Shenguang Octopus *** each beam intensity is below its individual threshold for stimulated Brillouin backscattering(SBS),collective behaviors are excited to enhance the octad *** particular,when two-color/cone lasers with wavelength separation 0.3 nm are used,the backward SBS reflectivities show novel behavior in which beams of longer wavelength achieve higher SBS *** property of SBS can be attributed to the rotation of the wave vectors of common ion acoustic waves due to the competition of detunings between geometrical angle and wavelength *** mechanism is confirmed using massively parallel supercomputer simulations with the three-dimensional laser–plasma interaction code LAP3D.

关键词： scattering tuning collective

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

全光汤姆逊散射X光源数值模拟

强激光与粒子束 2011年第5期23卷 1233-1238页

作者：谭放朱斌赵宗清曹磊峰谷渝秋张保汉中国工程物理研究院激光聚变研究中心四川绵阳621900

使用蒙特卡罗数值模拟程序研究了不同电子束和激光强度下,尾场电子束与超短脉冲激光发生汤姆逊散射获得的X光子能谱、角分布等,初步探索了180°散射下高质量X射线光源所需要的电子束与激光强度。数值模拟结果显示,为了尽量提高光子产额... 详细信息

使用蒙特卡罗数值模拟程序研究了不同电子束和激光强度下,尾场电子束与超短脉冲激光发生汤姆逊散射获得的X光子能谱、角分布等,初步探索了180°散射下高质量X射线光源所需要的电子束与激光强度。数值模拟结果显示,为了尽量提高光子产额并抑制非线性效应,激光归一化强度应为1的量级。为了获得方向性和单色性好、亮度高的X射线脉冲,需要较高的电子能量和较小的电子能散,电子束脉冲尽量短,且发散角尽量小。

关键词：超短超强激光尾波场加速汤姆逊散射 X光源

在线全文

学校读者我要写书评

暂无评论

自动化专业实验创新平台设计与教学研究

实验室研究与探索 2024年第6期43卷 42-46页

作者：霍鑫岳明潭弭宝涵张华鲁佳马杰哈尔滨工业大学航天学院哈尔滨150080

面向新工科背景下培养创新人才的需求,结合目前自动化专业学生培养的现状,参照飞行器地面半实物仿真测试装备,开发并搭建了模拟飞行转台实验创新平台。该实验创新平台由机械结构、驱动系统、控制系统、人机交互界面和通信接口共同组成,... 详细信息

面向新工科背景下培养创新人才的需求,结合目前自动化专业学生培养的现状,参照飞行器地面半实物仿真测试装备,开发并搭建了模拟飞行转台实验创新平台。该实验创新平台由机械结构、驱动系统、控制系统、人机交互界面和通信接口共同组成,可以实现俯仰、偏航和滚转的三自由度姿态模拟。教学实践结果表明,该平台不仅为学生提供被控对象拟合、PID控制器设计等基础实验,还可根据学生创新需求,使用预留接口自主设计创新实验;同时,具有形象生动、轻便易携带、人机交互简便、接口丰富、功能拓展性强等优势。

关键词：实验教学创新人才培养模拟飞行转台实验平台

同方期刊数据库

拍瓦激光与铜靶作用产生光核中子的数值模拟研究

在线全文

学校读者我要写书评

暂无评论

强激光与粒子束 2016年第10期28卷 52-56页

作者：张高维矫金龙齐伟贺书凯洪伟谷渝秋张保汉中国工程物理研究院激光聚变研究中心四川绵阳621900

激光驱动中子源由于中子通量高、短脉冲等特点受到广泛关注。通过辐射流体动力学、粒子动力学和蒙特卡罗三种数值模拟程序的组合使用,对超短强激光与铜靶作用产生光核中子进行了全物理过程模拟。首先使用辐射流体动力学程序获得激光预... 详细信息

激光驱动中子源由于中子通量高、短脉冲等特点受到广泛关注。通过辐射流体动力学、粒子动力学和蒙特卡罗三种数值模拟程序的组合使用,对超短强激光与铜靶作用产生光核中子进行了全物理过程模拟。首先使用辐射流体动力学程序获得激光预脉冲产生的预等离子体密度分布,然后将预等离子体输入粒子动力学程序获得超短强激光主脉冲产生的超热电子信息,最后将超热电子输入蒙特卡罗程序得到光核中子。模拟获得了光核中子的产额、能谱和角分布信息,发现采用强度1022 W/cm^2激光、直径和厚度均为4cm的Cu圆柱靶,可以获得产额为1.2×10~8/J的光核中子。

关键词：超短强激光等离子体中子源光核反应

磷肥用量对滨海盐土油菜光合性状和干物质生产的影响

在线全文

学校读者我要写书评

暂无评论

中国农学通报 2022年第34期38卷 22-26页

作者：张宝涵刘婧怡尤晶晶左青松扬州大学江苏省作物栽培生理重点实验室/江苏省粮食作物现代产业技术协同创新中心江苏扬州225009

为研究盐分土壤条件下磷肥对油菜光合性状和干物质生产的影响效应,以甘蓝型常规油菜品种‘宁油20号’为供试品种,设置不同磷肥用量处理,测定不同生育期叶面积、叶片净光合速率以及干物重。结果表明,0~120 kg/hm^(2)磷肥用量范围内,随着... 详细信息

为研究盐分土壤条件下磷肥对油菜光合性状和干物质生产的影响效应,以甘蓝型常规油菜品种‘宁油20号’为供试品种,设置不同磷肥用量处理,测定不同生育期叶面积、叶片净光合速率以及干物重。结果表明,0~120 kg/hm^(2)磷肥用量范围内,随着磷肥用量的增加,苗期和初花期叶面积指数、干物质积累量逐渐增加,成熟期籽粒产量及干物质积累量也逐渐增加。不施磷肥和30 kg/hm^(2)磷肥用量处理籽粒含油率较低,在磷肥用量达到60 kg/hm^(2)时再增加磷肥用量籽粒含油率无显著变化。苗期叶片净光合速率随磷肥用量的变化趋势与干物重变化一致,当磷肥用量达到60 kg/hm^(2)时进一步增加磷肥用量,初花期叶片净光合速率无显著变化。

关键词：油菜盐分土壤磷肥用量光合性状干物质积累