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Design of Thomson scattering diagnostic system on linear magnetized plasma device

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plasma Science and Technology 2022年第6期24卷 53-56页

作者： Mengmeng XU Qiaofeng ZHANG Jinlin XIE department of plasma physics and fusion Engineering School of Nuclear Science and TechnologyUniversity of Science and Technology of ChinaHefei 230026People's Republic of China CAS Key Lab of Geoscience Environment School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026People's Republic of China

In addition to the magnetic confinement fusion plasma,Thomson scattering has been applied to measure electron density and temperature of low-temperature *** on a linear magnetized plasma device,a set of Thomson scattering diagnostic system is designed to diagnose the plasma with n_(e)=10^(18)–10^(19)m^(-3)and T_(e)=2–*** to low plasma temperature and density,this diagnostic system needs high spectral resolution and collection efficiency to meet the requirements of electron velocity distribution function *** the bench test,it is confirmed that the spectral resolution reaches 0.01 nm,and theoretical collection efficiency is high enough to obtain a Thomson scattering spectrum by 1000 accumulations.

关键词： Thomson scattering low temperature plasma EVDF

Photocatalysts of Cr Doped TiO2 Film Prepared by Micro Arc Oxidation

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Chinese Journal of Chemical physics 2008年第5期21卷 487-492页

作者： Li Wan Jian-feng Li Jia-you Feng Wei Sun department of material Science and Engineering of Education Tsinghua University Beijing 100084China Institute of nuclear and New Energy Technology Tsinghua University Beijing 100084 China

A series of Cr doped TiO2 films were prepared by micro arc oxidation （MAO） using an electrolyte of Na3PO4＋K2Cr2O7. X-ray diffraction and scanning electron microscopy revealed that the films mainly consisted of anatase phase with a porous surface morphology. The films have an excellent photocatalytic effect for degradation of methylene blue and decomposition of water under visible light illumination. This arises from the formation of Cr3＋/Cr4＋ and oxygen vacancy energy levels owing to Cr doping. The former reduces the electron-hole recombination chance, while the latter generates a new gap between the conduction band （CB） and valence band （VB） of TiO2, which lowers the photo energy of the excited electron in the VB to the oxygen vacancy states. The mechanisms for film synthesis during the MAO process are also presented.

关键词： TiO2 Cr doping Photocatalysis Micro arc oxidation

Effects of q-profiles of a weak magnetic shear on energetic ion excited q=1 mode in tokamak plasmas

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Chinese physics B 2016年第1期25卷 690-696页

作者：李泽宇王先驱王晓钢 State Key Lab of nuclear physics and Technology School of PhysicsPeking UniversityBeijing 100871China Institute of fusion Science.School of Physical Science and Technology Southwest Jiaotong UniversityChengdu 610031China department of physics Harbin Institute of TechnologyHarbin 150001China

In this paper, we study the effect of safety factor profiles, particularly with a very weak magnetic shear, on the m/n = 1 mode excited by energetic ions in tokamak plasmas. It is found that the profile plays a significant role in the onset of the mode, and the thresholds for the instability are also derived. The numerical results for configurations with conventional or reversed non monotonic magnetic shears are discussed. The effects of radial location of rational surfaces, edge q value, and flatness of q-profile on the energetic ion excited mode are further analyzed in detail.

关键词： safety factor profile magnetohydrodynamics tokamak energetic particles

Observation of Thomson Scattering off Entropy Waves in a Laser-Produced plasma

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Chinese physics Letters 2001年第10期18卷 1377-1379页

作者： ZHENG Jian BAI Bo LIU Wan-dong YU Chang-Xuan JIANG Xiao-Hua YUAN Xiao-dong LI Wen-Hong ZHENG Zhi-Jian department of Modern physics University of Science and Technology of ChinaHefei 230027 Institute of nuclear physics and Chemistry Mianyang 621900

A new feature in the Thomson scattering spectrum is observed from a laser-produced aluminium plasma, which may be the Thomson scattering off entropy waves in the plasma. Such a feature is only observable when the ener... 详细信息

关键词： entropy observable Entropy

Effects of the entrance channel mass asymmetry in fusion reactions

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Chinese physics C 2010年第10期34卷 1602-1608页

作者：卞宝安张丰收 School of Science Jiangnan University The Key Laboratory of Beam Technology and material Modification of Ministry of Education College of Nuclear Science and TechnologyBeijing Normal University Center of Theoretical nuclear physics National Laboratory of Heavy Ion Accelerator of Lanzhou

The symmetric and asymmetric fusion reaction systems forming the same compound nuclei ^26Al, ^30Si, ^38Ar and ^170Hf are investigated with the frame of improved isospin dependent quantum molecular dynamics model. The entrance channel mass asymmetry dependence of compound nucleus formation is found by analyzing the shell correction energies, the Coulomb barriers and the fusion cross sections. The calculated fusion cross sections agree quantitatively with the experimental data. The results indicate that compound nucleus formation is favorable for the systems with larger mass asymmetry because of the smaller Coulomb contribution to the fusion barrier.

关键词： fusion reactions mass asymmetry Coulomb barrier

A new trend in nuclear physics development

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Science China(physics,Mechanics & Astronomy) 2017年第10期60卷 83-84页

作者： Bing Guo NaiYan Wang department of nuclear physics China Institute of Atomic Energy Beijing 102413 China

Atomic nuclei comprise a principal level of material *** physics,in itself an substantial area of study,serves as a link between atomic physics and particle *** main research areas of nuclear physics involve strong in... 详细信息

关键词：物理学发展电磁相互作用粒子物理学原子物理学强相互作用弱相互作用材料结构核物理

Understanding the isoscaling relationship in the fissioning system with evaluated data

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Chinese physics C 2021年第8期45卷 76-82页

作者： Yong-Jing Chen Yang-Yang Liu Li-Le Liu Fang-Yuan Wang Ying-Xun Zhang China nuclear Data Center China Institute of Atomic EnergyBeijing 102413China department of nuclear physics China Institute of Atomic EnergyBeijing 102413China Guangxi Key Laboratory of nuclear physics and Technology Guangxi Normal UniversityGuilin 541004China

The isoscaling parameters aevai in the fissioning systems,i.e.,those extracted from the Evaluated nuclear Data Library(ENDF/B-VIII.O)and the Joint Evaluated Fission and fusion File(JEFF-3.3),show an obvious difference from simple statistic model prediction where only the symmetry energy plays the dominant *** explain the aeVai as a function of the charge number of the fission fragment,a statistic scission point model is *** analysis shows that the effects of the shell correction,nuclear shape deformation,and intrinsic temperature of fission fragments are indispensable as well as the symmetry ***,an alternative method for extracting the intrinsic temperatures of fission fragments is proposed based on the isoscaling relationship in fission *** intrinsic temperatures of the light fragments are higher than those of the heavy fragments.

关键词： isoscaling analysis temperature of fission fragment shell correction nuclear shape deformation

Fourier Pseudospectral Solution for a 2D Nonlinear Paraxial Envelope Equation of Laser Interactions in plasmas

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Journal of Applied Mathematics and physics 2016年第12期4卷 2186-2202页

作者： Abdelrahman I. Mahdy plasma and nuclear fusion department Nuclear Research Centre Atomic Energy Authority Cairo Egypt

We apply a Fourier pseudospectral algorithm to solve a 2D nonlinear paraxial envelope-equation of laser interactions in plasmas. In this algorithm, we first use the second order Strang time-splitting method to split the envelope-equation into a number of equations, next we spatially discrete the filed quantity and its spatial derivatives in these equations in term of Fourier interpolation polynomials (FFT), finally we sequentially integrate the resultant equations by means of a discrete integration method in order to obtain the solution of the envelope-equation. We carry out several numerical tests to illustrate the efficiency and to determine accuracy of the algorithm. In addition, we conduct a number of numerical experiments to examine its performance. The numerical results have shown that the algorithm is highly efficient and sufficiently accurate to solve the 2D envelope-equation, furthermore, it yields an optimal performance in simulating fundamental phenomena in laser interactions in plasmas.

关键词： Laser plasmas Interactions Laser Envelope-Equation Fourier Pseudospectral Method Nonlinear Schrödinger Equation

Molecular dynamics simulations of temperature effect on tungsten sputtering yields under helium bombardment

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Science China(physics,Mechanics & Astronomy) 2018年第1期61卷 72-75页

作者： QingLing Meng LiangLiang Niu Ying Zhang GuangHong Lu department of physics Beihang University Beijing Key Laboratory of Advanced nuclear materials and physics Beihang University

Tungsten is the most promising plasma-facing material （PFM） for future nuclear fusion reactors such as international thermonuclear experimental reactor （ITER） owing to its high melting temperature, high thermal conductivity and low hydrogen retention. Under ITER-relevant conditions, a large amount of helium from the fusion reactions will constantly bombard the PFM. Though the energies of helium atoms in different regions are different,

关键词： Molecular dynamics simulations of temperature effect on tungsten yields under helium bombardment