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Chinese Physics Letters 2009年第9期26卷 271-274页

作者：黄晚晴韩伟王海军苗心向叶亚云李富全冯斌景峰郑万国 research center of laser fusion China Academy of Engineering Physics Mianyang 621900

laser-induced damage is a key lifetime limiter for damage threshold on two different laser facilities optics in large laser facilities. Fused silica is tested to find the of different apertures. The damage threshold shows that the corners of the component are less damage resistant. The acid etch on a corner does not effectively increase the damage threshold. A statistics-based model is presented to extrapolate the threshold data in a small-aperture test to predict the damage threshold under functional conditions.

关键词： No English Keyword

Space-Resolved Diagnosis for Electron Temperature of laser-Produced Aluminum Plasma

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Chinese Physics Letters 2011年第6期28卷 194-197页

作者： ZHAO Yang DENG Bo XIONG Gang HU Zhi-Min WEI Min-Xi ZHU Tuo SHANG Wan-Li LI Jun YANG Guo-Hong ZHANG Ji-Yan YANG Jia-Min research center of laser fusion China Academy of Engineering PhysicsMianyang 621900

The K−shell emission spectra of laser-produced aluminum plasma are measured by a space-resolved spectrometer consisting of a flat crystal spectrometer with a 20μm wide space−resolved *** using the approximation of the steady collisional-radiative equilibrium model,the interstage line intensity ratios of Ly-αresonance line to He−αresonance line are given as a function of electron *** spectra profiles are decomposed to resonance line and the overlapped high-order satellites *** reliable electron temperature is deduced from the interstage line intensity ratios of the decomposed resonance *** results of spaced-resolved temperature are compared with the hydrodynamic *** diagnostics of electron temperature for laser-produced plasma is developed.

关键词： temperature resolved decomposed

Analysis of the Intrinsic Uncertainties in the laser-Driven Iron Hugoniot Experiment Based on the Measurement of Velocities

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Chinese Physics Letters 2016年第8期33卷 91-95页

作者：章欢段晓溪张琛刘浩张惠鸽薛全喜叶青王哲斌蒋刚 Institute of Atomic and Molecular Physics Sichuan University laser fusion research center

One of the most challenging tasks in the laser-driven Hugoniot experiment is how to increase the reproducibility and precision of the experimental data to meet the stringent requirement in validating equation of state models. In such cases, the contribution of intrinsic uncertainty becomes important and cannot be ignored. A detailed analysis of the intrinsic uncertainty of the aluminum-iron impedance-match experiment based on the measurement of velocities is presented. The influence of mirror-reflection approximation on the shocked pressure of Fe and intrinsic uncertainties from the equation of state uncertainty of standard material are quantified, Furthermore, the comparison of intrinsic uncertainties of four different experimental approaches is presented. It is shown that, compared with other approaches including the most widely used approach which relies on the measurements of the shock velocities of AI and Fe, the approach which relies on the measurement of the particle velocity of Al and the shock velocity of Fe has the smallest intrinsic uncertainty, which would promote such work to significantly improve the diagnostics precision in such an approach.

关键词： of is Analysis of the Intrinsic Uncertainties in the laser-Driven Iron Hugoniot Experiment Based on the Measurement of Velocities in Al on

Hot-electron deposition and implosion mechanisms within electron shock ignition

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Chinese Physics B 2020年第10期29卷 354-362页

作者： Wan-Li Shang Xing-Sen Che Ao Sun Hua-Bing Du Guo-Hong Yang Min-Xi Wei Li-Fei Hou Yi-Meng Yang Wen-Hai Zhang Shao-Yong Tu Feng Wang Hai-En He Jia-Min Yang Shao-En Jiang Bao-Han Zhang research center of laser fusion China Academy of Engineering PhysicsMianyang 621900China

A hot-electron driven scheme can be more effective than a laser-driven scheme within suitable hot-electron energy and target density. In our one-dimensional (1D) radiation hydrodynamic simulations, 20× pressure enhancement was achieved when the ignitor laser spike was replaced with a 60-keV hot-electron spike in a shock ignition target designed for the National Ignition Facility (NIF), which can lead to greater shell velocity. Higher hot-spot pressure at the deceleration phase was obtained owing to the greater shell velocity. More cold shell material is ablated into the hot spot, and it benefits the increases of the hot-spot pressure. Higher gain and a wider ignition window can be observed in the hot-electron-driven shock ignition.

关键词： shock ignition inertial confinement fusion hot electron plasma fusion

Stimulated Brillouin Scattering Damage of Large-Aperture Fused Silica Grating

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Chinese Physics Letters 2010年第12期27卷 83-85页

作者：韩伟黄晚晴李恪宇王芳冯斌贾怀庭李富全向勇景峰郑万国 research center of laser fusion China Academy of Engineering Physics Mianyang 621900

laser induced damage experiment is carried out on a large aperture laser facility. Severe damage is observed on a large-aperture fused silica grating which presents dense craters on the front surface and six cracks alternatively located at the front and the rear surface. The bizarre fact about the damage on the grating is that, unlike other optics, the damage craters are almost on the front surface. According to observation, damage phenomenon is due to the stimulated Brillouin scattering （SBS） effect occurring in the grating, which includes the transverse SBS, the back SBS and the zigzag SBS.

关键词： Optics quantum optics and lasers

Time-Resolved Radiography using Chirp-Pulse Proton Beams

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Chinese Physics Letters 2011年第3期28卷 136-139页

作者： TENG Jian ZHAO Zong-Qing ZHU Bin HONG Wei CAO Lei-Feng ZHOU Wei-Min SHAN Lian-Qiang GU Yu-Qiu laser fusion research center China Academy of Engineering PhysicsMianyang 621900

Protons accelerated by the target normal sheath acceleration(TNSA)mechanism have a wide energy spectrum and are called chirp-pulse *** numerical simulation of chirp-pulse proton radiography in an implosion process with single shot is carried out using the Monte Carlo *** different methods are *** first method,proton framing radiography,uses a stack of radiochromic film layers as the *** layer deposits protons with energy corresponding to the Bragg peak,which can record the transient state of the implosion *** second method,proton streak radiography,uses an external magnetic field to deflect *** energies correspond to different *** using a slit before the magnetic field,one-dimensional spatial resolution and temporal resolution can be *** method is more suitable for the diagnosis of the implosion process.

关键词： process method resolution

Effect of Air Gap on Dual-Tripler Broadband Third-Harmonic Generation

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Chinese Physics Letters 2010年第2期27卷 135-137页

作者：韩伟王芳王礼全贾怀庭王伟李富全冯斌向勇李恪宇钟伟 research center of laser fusion China Academy of Engineering Physics Mianyang 621900

We experimentally study the effect of the air gap on conversion efficiency and the spectrum of generated third-harmonic pulses in the dual-tripler broadband third-harmonic generation scheme. The experimental results are in good agreement with predictions that the 4-cm air gap is equivalent to a full cycle of phase mismatch among the three interacting pulses （i.e. the fundamental, second-harmonic and third-harmonic pulse）. The experimental results also show that the spectrum of the third-harmonic pulse is sensitive to the air gap. We also point out that the air gap effect can be ignored when the dual-tripler system is located in 1000 Pa atmosphere. These results will guide the design of the broadband third-harmonic generation system in high power lasers.

关键词： Chinese climate network complex systems small world community

Atomistic investigation of ablation of amorphous polystyrene under femtosecond laser pulse

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Science China(Physics,Mechanics & Astronomy) 2015年第3期58卷 64-70页

作者： HUANG YanHua SONG ChengWei ZHANG JunJie SUN Tao research center of laser fusion China Academy of Engineering Physics center for Precision Engineering Harbin Institute of Technology

In the present work we elucidate the thermodynamic mechanisms of femtosecond(fs)laser ablation of amorphous polystyrene by means of molecular dynamics(MD)*** effects of extrinsic parameter of laser pulse intensity and intrinsic parameter of molecular architecture on the laser ablation are further *** results show that the laser ablation-induced polymeric material removal is achieved by evaporation from the surface and expansion within the ***,inter-chain sliding and intra-chain change also play important roles in the microscopic deformation of the *** is found that both the laser pulse intensity and the arrangement of phenyl groups have significant influence on the fs laser ablation of polystyrene.

关键词： polystyrene femtosecond laser ablation molecular dynamics laser intensity molecular architecture

Molecular Dynamics Simulations of the Interface between Porous and Fused Silica

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Chinese Physics Letters 2020年第10期37卷 39-42页

作者： Ye Tian Xiaodong Yuan Dongxia Hu Wanguo Zheng Wei Han laser fusion research center China Academy of Engineering PhysicsMianyang 621900China

Molecular dynamics simulations are performed to gain insights into the structural and vibrational properties of interface between porous and fused *** Si–O bonds formed in the interface exhibit the same lengths as the bulk material, whereas the coordination defects in the interface are at an intermediate level as compared with the dense and porous *** bonds are identified from the interface, which are associated with the reorganization of the silica *** bond angle distributions show that the O–Si–O bond angles keep the average value of 109°, whereas the Si–O–Si angles of the interface present in a similar manner to those in porous *** the slight structural differences, similarities in the vibrations are observed, which could further demonstrate the stability of porous silica films coated on the fused silica.

关键词： interface porous Molecular

Diagnostic Technique of Neutron Doppler Broadening for Indirectly-Driven Implosions

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Plasma Science and Technology 2004年第3期6卷 2346-2349页

作者：熊勇丁永坤郑志坚陈铭 research center of laser fusion China Academy of Engineering Physics Mianyang 621900 China

The neutron Doppler broadening in inertial confinement fusion has been acquired from the time of flight for the neutron, from which the fuel ion temperature can be derived. An ultrafast-quenched plastic scintillation detector was used to measure the time of flight for the neutron at a low-imploded DT neutron yield (5×107-1×108) in the experiment performed on the Shenguang Ⅱ laser facility. The typical temperatures of ablating targets for indirect drive were around 2.8 keV and the uncertainties were ±30 % - ±40%. The detection efficiency of the detector for DT neutrons was calibrated at a K-400 accelerator. The time response function of the detection system was calibrated by imploded neutrons from a DT-filled capsule, which can be regarded as a S function pulsed neutron source due to its much narrower pulse width than that of the measured neutron time-of-flight spectrum.

关键词： neutron Doppler broadening indirect-driven implosions response function ion temperatures