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Studies on the motion and radiation of interior plasmas in gas-filled hohlraums with different laser entrance hole sizes

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Plasma Science and Technology 2024年第7期26卷 40-47页

作者：郭亮李欣李琦李三伟胡昕李晋邓博邓克立王强强曹柱荣侯立飞车兴森杜华冰徐涛何小安李志超蒋小华蒋炜郑春阳郑无敌宋鹏丁永坤杨冬杨家敏 Research Center of Laser Fusion China Academy of Engineering PhysicsMianyang 621900People’s Republic of China Institute of Applied Physics and Computational Mathematics Beijing 100088People’s Republic of China

An experiment on 100 k J laser facility is performed to study the motive features and radiation properties of plasmas from different areas inside gas-filled cylindrical *** hohlraums are designed to possess one open end and one laser entrance hole(LEH)with different diameters,which would or not result in the blocking of the *** x-ray streak camera that is set at 16 degrees with respect to the hohlraum axis is applied to acquire the timeresolved x-ray images from the open *** on the images,we can study the evolutions of the wall plasma,corona bubble plasma and LEH plasma simultaneously through an equivalent view field of hohlraum ***-group flat response x-ray detectors are applied to measure the x-ray *** order to understand these characteristics,our two-dimensional radiation hydrodynamic code is used to simulate the experimental *** the accuracy of reproduction,dielectronic recombination and two parameter corrections are applied in our *** on the comparison between experiments and simulations,we quantitatively understand the blocking process of LEH and the motion effects of other *** calibrated code is beneficial to design the gas-filled hohlraum in a nearby parameter space,especially the limit size of LEH.

关键词： gas-filled hohlraum plasma expansion LEH blocking

Ultrahigh Acceleration of Plasma Blocks by Nonlinear Forces for Side-On Laser Ignition of Solid Density Fusion Fuel

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Plasma Science and Technology 2013年第5期15卷 420-424页

作者： Heinrich HORA George H. MILEY HE Xiantu zheng wudi Paraskevas LALOUSIS Istvan FLDES Sandor SZATMARI Stavros MOUSTAIZIS Reynaldo CASTILLO University of New South Wales University of Illinois Urbana Institute of Applied Physics and Computation Mathematics Institute of Electronic Structure and Laser KFKI-Research Institute for Particle and Nuclear Physics University of Szeged Technical University of Crete Institute of Matter Structure and Laser Physics University of Western Sydney

A fundamental difference of very high intensity laser interaction with plasmas from solid targets appears with lasing at picosecond （ps） pulse durations in contrast to pulses of nanosec-onds （ns）. This can be seen from the more than 10,000 times higher acceleration with ps pulse du-rations than with thermal pressure determined interaction. A ps pulse duration produces instantly acting high-efficiency nonlinear （ponderomotive） electrodynamic force dominated acceleration in contrast to heating with longer pulses. The ps pulses accelerate high-density plasma blocks. This can be used by a new scheme of side-on driven laser fusion with generating a flame ignition in uncompressed fusion fuel of solid density resulting in a reaction velocity of more than 2000 km/s for DT.

关键词： laser driven fusion fast ignition nonlinear (ponderomotive) force ultrahighacceleration

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ICF点火靶定标关系与稳定性优化设计研究

强激光与粒子束 2015年第3期27卷 94-99页

作者：李欣戴振生郑无敌北京应用物理与计算数学研究所北京100088

激光等离子体相互作用(LPI)和瑞利-泰勒流体不稳定性(RTI)是影响间接驱动惯性约束聚变成功的两个主要不确定性因素。点火黑腔内环激光通道在靠近黑腔壁的区域是内环激光SRS背反产生与发展的主要区域。内环通道在该区域满足通道内外压力... 详细信息

激光等离子体相互作用(LPI)和瑞利-泰勒流体不稳定性(RTI)是影响间接驱动惯性约束聚变成功的两个主要不确定性因素。点火黑腔内环激光通道在靠近黑腔壁的区域是内环激光SRS背反产生与发展的主要区域。内环通道在该区域满足通道内外压力平衡和能量平衡条件。据此提出了间接驱动惯性约束聚变点火黑腔等离子体定标关系。结合描述靶丸内爆飞行阶段物理以及内爆性能的两个定标关系,提出了描述稳定性相对性能的指标。该指标可以指导点火靶设计,为LPI和RTI提供需要的裕量空间,是点火阈值因子(ITF)的补充。

关键词：惯性约束聚变激光等离子体相互作用瑞利-泰勒不稳定性等离子体定标关系点火靶设计

Effects of mode coupling between low-mode radiation flux asymmetry and intermediate-mode ablator roughness on ignition capsule implosions

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Matter and Radiation at Extremes 2017年第1期2卷 9-15页

作者： Jianfa Gu Zhensheng Dai Shiyang Zou Wenhua Ye wudi zheng Peijun Gu Shaoping Zhu Institute of Applied Physics and Computational Mathematics Beijing 100088China

The low-mode shell asymmetry and high-mode hot spot mixing appear to be the main reasons for the performance degradation of the National Ignition Facility(NIF)implosion *** effects of the mode coupling between low-mode P2 radiation flux asymmetry and intermediate-mode L=24 capsule roughness on the implosion performance of ignition capsule are investigated by two-dimensional radiation hydrodynamic *** is shown that the amplitudes of new modes generated by the mode coupling are in good agreement with the second-order mode coupling equation during the acceleration *** later flow field not only shows large areal density P2 asymmetry in the main fuel,but also generates large-amplitude spikes and *** the deceleration phase,the increasing mode coupling generates more new modes,and the perturbation spectrum on the hot spot boundary is mainly from the strong mode interactions rather than the initial perturbation *** combination of the low-mode and high-mode perturbations breaks up the capsule shell,resulting in a significant reduction of the hot spot temperature and implosion performance.

关键词： Mode coupling Low-mode drive asymmetry Intermediate-mode capsule roughness Ignition capsule implosion

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激光线聚焦驱动平面银靶的二维数值模拟

计算物理 2008年第1期25卷 36-42页

作者：郑无敌张国平北京应用物理与计算数学研究所

介绍新研制的二维非平衡辐射流体力学程序XRL2D的物理方程以及计算方法,并对神光II上典型的类镍银X光激光实验条件,用3种ALE计算方法模拟了预主脉冲线聚焦驱动银平面靶的流体运动.几种方法模拟给出的物理图像清晰且相似,类镍离子丰度分... 详细信息

介绍新研制的二维非平衡辐射流体力学程序XRL2D的物理方程以及计算方法,并对神光II上典型的类镍银X光激光实验条件,用3种ALE计算方法模拟了预主脉冲线聚焦驱动银平面靶的流体运动.几种方法模拟给出的物理图像清晰且相似,类镍离子丰度分布呈弯月形,同实验上XRL场图呈弯月形分布一致.对3种计算方法给出的结果进行了细致的比较分析.

关键词：数值模拟 ALE方法预主脉冲激光打靶 X光激光线聚焦等离子体

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类镍钽离子碰撞激发机制理论研究

中国激光 2000年第7期27卷 621-626页

作者：郑无敌蓝可北京应用物理与计算数学研究所北京100088

对类Ni Ta离子电子碰撞激发机制产生 4d → 4p跃迁三条激光线的增益与反转进行了探讨。首先研究了类Ni离子基态与类Co离子基态对这三条激光线上、下能级的激发与复合贡献因子及由激发产生的反转率和由复合产生的反转率 ;讨论了类Ni离子... 详细信息

对类Ni Ta离子电子碰撞激发机制产生 4d → 4p跃迁三条激光线的增益与反转进行了探讨。首先研究了类Ni离子基态与类Co离子基态对这三条激光线上、下能级的激发与复合贡献因子及由激发产生的反转率和由复合产生的反转率 ;讨论了类Ni离子与类Cu离子电离速率对类Ni离子布居弛豫时间和布居大小的影响。研究结果表明 ,考虑光子捕获效应及激光折射效应后 ,4 4 83nm激光线的最佳增益区域在Te ≈ 1～ 1.5keV ,Ne ≈ (1～ 4 )× 10 2 1cm- 3。

关键词：钽离子电子碰撞激发机制激光

点火黑腔等离子体定标关系及350 eV靶黑腔设计

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强激光与粒子束 2014年第8期26卷 142-147页

作者：李欣郝亮郑无敌葛峰俊北京应用物理与计算数学研究所北京100071

点火黑腔内环激光通道内靠近黑腔壁的区域是内环激光受激拉曼散射(SRS)背向散射产生与发展的主要区域。根据内环通道在该区域满足通道内外压力平衡和能量平衡,提出了间接驱动惯性约束聚变点火黑腔等离子体定标关系。该定标关系在一定程... 详细信息

点火黑腔内环激光通道内靠近黑腔壁的区域是内环激光受激拉曼散射(SRS)背向散射产生与发展的主要区域。根据内环通道在该区域满足通道内外压力平衡和能量平衡,提出了间接驱动惯性约束聚变点火黑腔等离子体定标关系。该定标关系在一定程度上统筹考虑靶丸性能、激光器指标和激光等离子体相互作用(LPI)。在此基础上,根据靶丸抑制流体不稳定的需求,提出了一个350eV点火黑腔设计,该设计可以较好地抑制内环LPI的发展,并对激光器设计提出了更高的要求。

关键词：间接驱动惯性约束聚变激光等离子体相互作用等离子体定标关系点火黑腔设计

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激光聚变冲击波点火的热斑形成机制

强激光与粒子束 2015年第3期27卷 40-46页

作者：康洞国郑无敌王敏裴文兵朱少平中国工程物理研究院研究生部北京100088 北京应用物理与计算数学研究所北京100094 上海激光等离子体研究所上海201800

通过对冲击波点火内爆过程的数值模拟分析点火热斑压缩及形成机制。分析了传统中心点火的内爆过程,热斑主要经历冲击波压缩和惯性压缩过程,点火主要通过惯性压缩来实现。并仔细分析了冲击波点火的内爆压缩过程,从内爆角度来看冲击波点... 详细信息

通过对冲击波点火内爆过程的数值模拟分析点火热斑压缩及形成机制。分析了传统中心点火的内爆过程,热斑主要经历冲击波压缩和惯性压缩过程,点火主要通过惯性压缩来实现。并仔细分析了冲击波点火的内爆压缩过程,从内爆角度来看冲击波点火并不是压缩和点火分开的两步过程,点火冲击波实际参与压缩过程,点火冲击波对热斑的直接影响很有限,热斑仍然主要通过壳层的惯性压缩实现点火。利用惯性压缩的定标关系及冲击波碰撞对壳层影响规律分析了热斑增压的物理机制,冲击波点火是通过点火冲击波与回冲击波的碰撞来提高壳层的密度,从而实现热斑压力的提升。

关键词：激光惯性约束聚变冲击波点火内爆热斑形成

First polar direct-drive exploding-pusher target experiments on the ShenGuang laser facility

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Chinese Physics B 2019年第9期28卷 288-294页

作者： Bo Yu Jiamin Yang Tianxuan Huang Peng Wang Wanli Shang Xiumei Qiao Xuewei Deng Zhanwen Zhang Zifeng Song Qi Tang Xiaoshi Peng Jiabin Chen Yulong Li Wei Jiang Yudong Pu Ji Yan Zhongjing Chen Yunsong Dong wudi zheng Feng Wang Shaoen Jiang Yongkun Ding Jian zheng Laser Fusion Research Center China Academy of Engineering PhysicsMianyang 621900China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China Institute of Applied Physics and Computational Mathematics Beijing 100088China IFSA Collaborative Innovation Center Shanghai Jiao Tong UniversityShanghai 200240China

Low density and low convergence implosion occurs in the exploding-pusher target experiment, and generates neutrons isotropically to develop a high yield *** order to validate the performance of ShenGuang(SG) laser facility and test nuclear diagnostics, all 48-beam lasers with an on-target energy of 48 kJ were firstly used to drive room-temperature, DT gas-filled glass *** optimization has been carried out and optimal drive uniformity was obtained by the combination of beam repointing and *** final irradiation uniformity of less than 5% on polar direct-drive capsules of 540 μm in diameter was achieved, and the highest thermonuclear yield of the polar direct-drive DT fuel implosion at the SG was 1.04 × 10^(13).The experiment results show neutron yields severely depend on the irradiation uniformity and laser timing,and decrease with the increase of the diameter and fuel pressure of the *** thin CH ablator does not impact the implosion performance, but the laser drive uniformity is *** simulated results validate that the cos γ distribution laser design is reasonable and can achieve a symmetric pressure *** optimization will focus on measuring the symmetry of the hot spot by self-emission imaging, increasing the diameter, and decreasing the fuel pressure.

关键词： polar direct-drive exploding-pusher target neutron yield irradiation uniformity