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Optimization of Electron Density and Temperature Profiles in Tokamaks via Safety Factor Profile

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Chinese Physics Letters 2001年第8期18卷 1101-1102页

作者： qiu xiao-ming PENG xiao-Dong Southwestern Institute of Physics P.O.Box 432Chengdu 610041

The turbulent particle and thermal transport scaling laws are derived by means of Lagrangian invariant of trapped electron dynamics in tokamaks,which are in good agreement with experimental *** the basis of the two scaling laws,it is proposed that the optimization of electron density and temperature profiles can be achieved by designing a desirable safety factor profile.

关键词： Electron scaling Profiles

Suppression of Rayleigh-Taylor instability by gyroviscosity and sheared axial flow in imploding plasma pinches

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核聚变与等离子体物理 2007年第2期27卷 87-94页

作者： HUANG Lin JIAN Guang-de qiu xiao-ming Southwestern In stitute of Physics Chengdu 610041

The synergistic stabilizing effect of gyroviscosity and sheared axial flow on the Rayleigh-Taylor instability in Z-pinch implosions is studied by means of the incompressible viscid magneto-hydrodynamic *** gyroviscosity(or finite Larmor radius) effects are introduced in the momentum equation through an anisotropic ion stress *** relation with the effect of a density discontinuity is *** results indicate that the short-wavelength modes of the Rayleigh-Taylor instability are easily stabilized by the gyroviscosity *** long wavelength modes are stabilized by the sufficient sheared axial ***,the synergistic effects of the finite Larmor radius and sheared axial flow can heavily mitigate the Rayleigh-Taylor *** synergistic effect can compress the Rayleigh-Taylor instability to a narrow wave number *** with a sufficient gyroviscosity and large enough flow velocity,the synergistic effect can completely suppressed the Rayleigh-Taylor instability in whole wave number region.

关键词：雷利-泰勒不稳定性回转粘性内向爆炸等离子体箍缩增敏作用有限拉莫尔旋进半径增长比率

Pinches-Induced Transport Reduction in Reversed Shear/Optimized Shear Tokamak Plasmas

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Chinese Physics Letters 1999年第9期16卷 662-664页

作者： qiu xiao-ming WANG Ai-ke Southwestern Institute of Physics (P.O.Box 432)Chengdu 610041

The analytical formulas for anomalous particle and ion thermal diffusivities,Dte and xti,are derived on the basis of the two-fluid equations of our previous paper[***.15(1998)721].The two formulas involve five factors:(reversed/optimized)magnetic shear LB(r),E x B sheared velocity VE(r),where E is from the gradient of the ion pressure Pi,and the three ways of coupling between them,L-1B(dVE/dr),L-1B VE,and ***,where k is the LB-dependent *** is found that the five factors can produce turbulent particle-and heat-pinch,i.e.,Dte<0 and xti<0,in the core region of tokamaks,and hence the effective particle and ion thermal diffusivities,Deeff and xieff,reduce significantly in that *** numerical results for Deeff and xieff are in good agreement with experimental values.

关键词： Shear particle reversed

Model for Heat Pinch in Reversed Magnetic Shear Tokamak Plasmas

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Chinese Physics Letters 1998年第10期15卷 721-723页

作者： qiu xiao-ming WANG Ai-ke Southwestern Institute of Physics P.O.Box 432Chengdu 610041

A simple model is proposed to explain the recent experiment in TFTR and the more recent one in *** the model the significant reduction of effective thermal diffusivities of ions and electrons(xieff and xeeff)is attributed to the inward flows of drift wave energy,induced by the synergistic effects of the reversed magnetic shear and E X B velocity shear,where E is due to ion pressure *** results demonstrate the predictions of the present model,in particular,the numerical results for x_(i)^(eff) are in good agreement with experimental trents.

关键词： reversed Plasma synergistic

Drift Mode Growth Rate and Associated Ion Thermal Transport in Reversed Magnetic Shear Tokamak Plasma

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Chinese Physics Letters 2001年第5期18卷 650-652页

作者： WANG Ai-Ke qiu xiao-ming Southwestern Institute of Physics P.O.Box 432Chengdu 610041

Drift mode linear growth rate and quasi-linear ion thermal transport in the reversed magnetic shear plasma are investigated by using the two-fluid theory,previously developed by Weiland and the Chalmers group[***,29(1989)1810;ibid.30(1990)983].The theory is here extended to including both the radial electrical field shear(d E_(r)/dr)and the electron fluid velocity(V_(e))in the sheared coordinate ***,Ve describes the coupling between the safety factor q and the E_(r) × B velocity *** influences on the growth rate and associated ion thermal transport are obtained numerically,In addition,the ion heat pinch in the reversed shear plasma is ***,the present conclusions are in good agreement with the experimental results.

关键词： reversed Shear theory

Theoretical Studies on the Thermodynamic Properties and Detonation Performances of Bicyclic Nitramines:TNAD Isomers

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Chinese Journal of Structural Chemistry 2006年第11期25卷 1309-1320页

作者： qiu Ling xiao He-ming GONG Xue-Dong JU Xue-Hai Institute for Computation in Molecular and Material Science School of Chemical Engineering Nanjing University of Science and Technology Nanjing 210094 China

Ab initio molecular orbital calculations have been performed at Hartree-Fock （HF）, second-order Mrller-Plesset （MP2）, and hybrid density functional theory （DFT） B3LYP levels with 6-31G^＊＊ basis set to investigate the low sensitive explosive trans-1,4,5,8-tetranitro-1,4,5,8- tetraazadecalin （TNAD） and its seven bicyclic isomers. Their molecular geometries, electronic structures, thermodynamic properties, and detonation performances were predicted and compared. The relationships between structures and various properties were discussed in detail. The calculated results agree well with the available experimental data, and suggest that some compounds may be novel potential candidates of high energy density materials （HEDMs） with performances better than TNT （2,4,6-trinitrotoluene） and similar to RDX （1,3,5-trinitro-1,3,5-triazacyclohexane）.

关键词： bicyclic nitramine Hartree-Fock method MP2 method density functional theory thermodynamic properties detonation performances

SYNERGETIC MITIGATION OF THE RAYLEIGH-TAYLORINSTABILITY BY SHEAR AXIAL FLOWS ANDFINITE LARMOR RADIUS

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核聚变与等离子体物理 2003年第2期23卷 77-83页

作者： HUANG Lin, qiu xiaoming, JIAN Guangde(Southwestern Institute of Physics, Chengdu 610041) Southwestern Institute of Physics Chengdu 610041

A hybrid model of MHD and kinetic theory is proposed to investigate the synergetic stabilizing effects of sheared axial flow and finite Larmor radius on the RayleighTaylor instability in Zpinch *** our model the MHD plasma is considered to respond to a perturbation with exp at frequency ω+ik2⊥ρ2iΩi instead of frequency ω,where k2⊥ρ2i is the finite Larmor radius effects given from the general kinetic theory of magnetized *** linearized continuity and momentum equations include automatically the finite Larmor radius *** relation is derived,which includes the effects of a density discontinuity and the finite Larmor radius as well as a sheared flow that produces the KelvinHelmholtz *** dispersion equation is examined in three *** results indicate that the synergetic effect of sheared axial flow and the finite Larmor radius can mitigate both the RayleighTaylor instability and the hybrid RayleighTaylor/KelvinHelmholtz ***,the synergetic mitigation effect is stronger than either of them acting separately.

关键词：等离子体物理不稳定性协同缓和效应有限拉莫尔辐射散射方程 Z-箍缩剪切层流动

圆柱形阳极层霍尔等离子体加速器的质点网格方法模拟

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物理学报 2009年第8期58卷 5520-5525页

作者：耿少飞唐德礼赵杰邱孝明核工业西南物理研究院成都610041

对圆柱形阳极层霍尔加速器内的放电等离子体运用二维质点网格方法(particleincell)进行数值模拟,用蒙特卡罗碰撞方法处理带电粒子与中性粒子之间的碰撞.得到了放电通道内离子与电子的分布以及离子流的运动,并且对出口外侧的能量分布进... 详细信息

对圆柱形阳极层霍尔加速器内的放电等离子体运用二维质点网格方法(particleincell)进行数值模拟,用蒙特卡罗碰撞方法处理带电粒子与中性粒子之间的碰撞.得到了放电通道内离子与电子的分布以及离子流的运动,并且对出口外侧的能量分布进行了统计.结果发现圆柱形阳极层等离子体加速器的磁场对电子有明显的约束作用,电子集中于阳极附近很小的区域内.由于电磁场的特殊分布,离子流呈现出双峰式的分布.离子能量范围从放电电压的20%到接近放电电压,平均能量在放电电压的40%—50%之间.

关键词：质点网格方法蒙特卡罗碰撞数值模拟阳极层霍尔等离子体加速器

TiNi形状记忆合金与不锈钢激光钎焊接头界面组织特征

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中国有色金属学报 2007年第3期17卷 373-377页

作者：李明高孙大千邱小明吉林大学材料科学与工程学院长春130025

通过扫描电子显微镜、能谱仪及X射线衍射技术分析TiNi形状记忆合金与1Cr18Ni9Ti不锈钢激光钎焊接头界面反应层的组织结构特征。结果表明:TiNi形状记忆合金与不锈钢激光钎焊接头钎缝主要由α-Ag固溶体、α′-Cu固溶体和Ag-Cu共晶相组成;... 详细信息

通过扫描电子显微镜、能谱仪及X射线衍射技术分析TiNi形状记忆合金与1Cr18Ni9Ti不锈钢激光钎焊接头界面反应层的组织结构特征。结果表明:TiNi形状记忆合金与不锈钢激光钎焊接头钎缝主要由α-Ag固溶体、α′-Cu固溶体和Ag-Cu共晶相组成;不锈钢/银基钎料界面反应区由3层连续的反应层构成,分别为:奥氏体(A),马氏体(M)/A和M/α-Ag+α′-Cu+M;TiNi形状记忆合金/银基钎料界面反应层主要由Ti(Ni,Cu)+(Ni,Cu)Ti2化合物组成。

关键词： TiNi形状记忆合金不锈钢激光钎焊界面结构