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Effect of Lanthanum-praseodymium-cerium Mischmetal on Mechanical Properties and Microstructure of Mg-A1 Alloys

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Journal of Wuhan University of Technology(Materials Science) 2011年第1期26卷 102-104页

作者：易勇 research center of {2. fusion China Academy of Engineering Physics School of Materials Science & Engineering Southwest University of Science & Technology

The effects of lanthanum-praseodymium-cerium mischmetal （LPC） on the microstructure and mechanical properties of Mg-Al alloy were investigated. With the addition of LPC, an additional rod-like Al11La3 phase was deposited in the alloy. LPC greatly improves the tensile strength of cast Mg-Al alloys but negatively affects the elongation of cast alloys above 473 K. Cast alloys are strengthened by both precipitation strengthening and dispersion strengthening at ambient temperature. When the temperature exceeds 473 K, only the dispersion operates as a strengthening mechanism.

关键词： lanthanum-praseodymium-cerium mischmetal Mg-alloy microstructure mechanical properties

Experimental investigation of supersonic radiation propagation in low-density plastic and copper-doped foams

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Science china(Physics,Mechanics & Astronomy) 2005年第5期48卷 549-558页

作者： JIANG Shaoen1, XU Yan2. DING Yongkun1, LAI Dongxian2. ZHENG Zhijian1, HUANG Yixiang1, LI Jinghong2. SUN Kexu1, HU Xin1, ZHANG Wenhai1, YI Rongqing1, CUI Yanli1 & CHEN Jiusen1 1. National Key Laboratory of laser fusion, laser fusion research center, mianyang 62.900, china 2. Institute of Applied Physics and Computation Mathematics, Beijing, 100088, china 1. National Key Laboratory of laser fusion Laser Fusion Research Center 621900 Mianyang China 2. Institute of Applied Physics and Computation Mathematics 100088 Beijing China

Eight beams of 0.35 μm laser with pulse duration of 1 ns and total energy of 2.kJ enter into a hohlraum to create intense X-ray radiation of 140 eV on the Shenguang ΙΙ laser facility. Plastic foam (C6H12. and copper-doped foam (C6H12.u0.394) with a density of 50 mg/cm3 are heated by X-ray radiation emitted from the hohlraum. The breakout time of the radiation wave is measured by a tri-chromatic streaked X-ray spectrometer (TCS) that consists of a set of three imaging pinholes and an array of three transmission gratings coupled with an X-ray streak camera (XSC). At one shot, the simultaneous measurements of the delay of the drive source and the radiation transport at two energies (2.0 eV, 840 eV) through the foam have been made for the first time. The experimental results indicate that the time delays vary with photon energies. With a transmission grating spectrometer (TGS), the spectra transmitting foams were measured, and the lower limit of the optical depth was measured. The radiation at energy of 2.0 eV propagates through plastic foam at a faster velocity, compared with the radiation at energy of 840 eV; while the results of copper-doped foam are reverse. The optical depth in the plastic foam is less than 1, and in the doped foam it is more than 1.

关键词： supersonic radiation wave, plastic foam, copper-doped foam, optical depth.

Processing technique of target capsule's micro inflation hole with a scanning probe

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Science china(Technological Sciences) 2004年第1期47卷 77-84页

作者： SUN Tao, YAN Yongda, GAO Dangzhong, TANG Yongjian, FU Yibei & DONG ShenPrecision Engineering research Institute, Harbin Institute of Technology, Harbin 150001, china research Centre of laser fusion, Chinese Academy of Engineering Plysics, mianyang 62.900, china Institute of Nuclear Physics and Chemistry, Chinese Academy of Engineering Physics, mianyang 62.900, china 1. Precision Engineering research Institute Harbin Institute of Technology 150001 Harbin China 2. research Centre of laser {2. Chinese Academy of Engineering Plysics 621900 Mianyang China 3. Institute of Nuclear Physics and Chemistry Chinese Academy of Engineering Physics 621900 Mianyang China

To resolve inflation of inertial confinement fusion (ICF) target and encapsulation of micro inflation hole with adhesive, a scanning probe microscope (SPM) diamond microprobe was used as the cutting tool with SPM in contact mode. Some parameters influencing the quality of micro inflation hole, such as the scanning direction of the diamond tip, the scanning rate and the contact force are discussed. Accurate taper hole was achieved whose climension and precision could meet the requirements of inflation and encapsulation technique of micro hole. The experimental results show that using SPM diamond microprobe as the cutting tool and with special processing technique, the precision machining of target capsule's taper inflation hole can be realized. A novel operative technology for filling high Z gas to target is provided.

关键词： target capsule, scanning probe microscope (SPM), diamond microprobe, processing technique, brittle material.

Entropic stochastic resonance in a confined structure driven by dichotomous noise and white noises

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Chinese Physics B 2012年第8期21卷 71-77页

作者：郭锋程晓锋李少甫曹文黎恒 School of Information Engineering Southwest University of Science and Technology research center of {2. fusion China Academy of Engineering Physics

The entropic stochastic resonance （ESR） in a confined system subjected to dichotomous noise and white noise and driven by a periodic sinusoidal force along the x axis of the structure and a time-dependent force in the declining direction, is investigated. Under the adiabatic approximation condition and based on the two-state theory, the expression of the output signal-to-noise ratio （SNR） is obtained. The results show that the SNR is a non-monotonic function of the strengths of dichotomous noise, white noise, and correlated strength of correlated noise. In addition, the SNR varies non-monotonically with the increase of the shape parameters of the confined structure, and also with the increase of the constant force along the y axis of the structure. The influence of the correlation rate of the dichotomous noise, and that of the frequency of the periodic force on the SNR are discussed.

关键词： entropic stochastic resonance dichotomous noise correlated noise square-wave signal,signal-to-noise ratio

Detecting the uniformity of TPX foam targets using -ray technology

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Detecting the uniformity of TPX foam targets using -ray te...

Study on Thermodynamic Properties of Lithium by First-principles and Quasi-harmonic Debye Model

中国核学会核材料分会2.07年度学术交流会

作者： Shan Wenwen~1 Zhang Lin (research center of {2. fusion,china Academy of Engineering Physics,mianyang 62.900)

The density uniformity of the foams used in inertial-confinement-fusion targets and Z-pinch loads is critical to understand the experimental *** average foam density used to be gravimetrically determined without providing any information on the density uniformity. This paper introduces a (?)-ray technology used to determine the density uniformity of foams. It shows that the (?)-ray technology can identify the spacial distribution of the density in a foam,thereby afford a new method for the process control in synthesizing foams.A comparison of the (?)-ray method with the gravimetry and the X-ray radiography is presented.

关键词： TPX foam Density uniformity beta radiation detecting technology

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Semiconductor Photonics and Technology 2010年第4期16卷 141-145页

作者： LEI Jiehong1,3, DUAN Hao2. XING Pifeng3, TANG Yongjian3 (1. Physics and Electronic Information Institute, china West Normal University, Nanchong 637002. CHN 2. Chemistry and Chemical Engineering College, mianyang Normal University, mianyang 62.000, CHN 3. research center of laser fusion, china Academy of Engingeering Physics, mianyang 62.900, CHN) Physics and Electronic Information Institute China West Normal University Nanchong 637002 Chemistry and Chemical Engineering College Mianyang Normal University Mianyang 621000 research center of {2. fusion China Academy of Engingeering Physics Mianyang 621900

In this paper, the lattice parameter and bulk modulus of lithium(Li) at different pressures and temperatures are calculated by using the density functional theory method within the generalized gradient approximation(GGA).Through the quasi-harmonic Debye model, the thermodynamic properties of Li are predicted. The dependences of the normalized primitive cell volume V/V0 on pressure P, the variation of the thermal expansion coefficient α with pressure P and temperature T, as well as the dependences of the heat capacity Cv on pressure P and temperature T are obtained systematically in the ranges of 0~100 GPa and 0~2.000 K.

关键词： density functional theory the quasi-harmonic Debye model thermodynamic properties

Analysis and Design of CW-LD Pumped StableQ-switched laser

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Analysis and Design of CW-LD Pumped StableQ-switched Laser

国家点火装置(NIF)点火靶制备技术研究进展

第九届全国青年通信学术会议

作者： Huang Xiu-jiang, Sui Than, Li Ming-zhong, Liu Yong-zhi School of Optic-Electronic Infonnation, UEST of china, Chengdu, china 610054. {2. fusion research center of CAEP, mianyang, china 62.000

＜正＞ A high power continuous wave （CW） laser diode （LD） pumped acousto-optic Q-switched Nd:YVO4 laser is presented. A short pulse at the 1064 run is obtained. With a repetition rate of 50 kHz, the maximum average output power of 5.72.W is achieved. The optical conversion efficiency and the slope efficiency are up to 2.% and 32.4% respectively. At the repetition rate of 10 kHz and the pulse width of 16.3ns, the maximum single pulse energy of 2.6 μJ and the peak power of 13kW are acquired. The laser can be used as a signal source in the tree-space optical communication. The output signal agrees with the modulate signal well.

关键词： Nd:YVO4 acousto-optic Q-switched CW-LD solid-state laser signal source

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物理 2009年第12期38卷 914-919页

作者：杜凯唐永建中国工程物理研究院激光聚变研究中心绵阳621900

文章介绍了国家点火装置(NIF)点火靶制备技术在近年来取得的一些最新进展,主要内容包括芯轴与靶丸的制备,氘氚(DT)冰层的均匀化等方面.

关键词：国家点火装置(NIF) 靶丸柱腔

Investigation of stimulated rotational Raman scattering of the high-power broadband laser with applied angular dispersion

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Chinese Physics B 2013年第12期22卷 276-279页

作者：樊心民吕志伟林殿阳刘颖朱成禹何伟明丁磊 National Key Laboratory of Science and Technology on Tunable laser Harbin Institute of Technology research center of {2. fusion China Academy of Engineering Physics

Smoothing by spectral dispersion （SSD） leads to considerable improvement on laser-irradiation uniformity in far field for fusion lasers. Phase modulation in time and spectral angular dispersion （SAD） across the beam introduced by SSD will affect the stimulated rotational Raman scattering （SRRS） gain in the near field. This paper focuses on the influence of SAD on SRRS gain under different laser conditions. Results show that the SAD will aggravate the generation of SRRS when the laser initial additional phase is constant. On the contrary, the SAD can reduce the SRRS gain if appropriate SSD parameters are adopted when the laser initial additional phase is variable. SSD has a certain application prospect in SRRS suppression.

关键词： spectral angular dispersion smoothing by spectral dispersion rotational Raman scattering