电子回旋共振加热期间的电子热输运和约束

采用ONETWO软件对在HL-2A托卡马克上电子回旋共振加热的实验进行分析,研究了ECRH加热期间的电子热输运和约束行为.ECRH引起了等离子体的共振区域电子温度上升,电子热输运系数变大.同时共振区域能量的增加使能量约束变坏,约束模式由一般模式(O模)转变为低约束模式(L模),能量约束时间下降.这些结果将对HL-2A中进一步提高安全运行和电子热输运的研究提供参考.     

中国环流器二号A装置物理实验研究进展

本文介绍了中国环流器二号A(HL-2A)装置概况、系统工程以及在磁约束聚变物理研究方面取得的若干重要进展,尤其是在HL-2A装置上成功实现了具有边缘局域模的高约束模式运行,是我国磁约束聚变实验研究史上具有里程碑意义的重大进展.近年来利用该装置可近性好,原创的加料与控制技术以及先进的高时空分辨诊断系统等独特优势,在HL-2A装置上开展了国际热核聚变实验堆(International Thermonuclear Experimental Reactor,ITER)及未来聚变堆等离子体相关的前沿物理问题与关键技术的研究,获得了一批国际磁约束核聚变领域创新科技成果,为ITER的运行与实验以及未来聚变堆的设计提供了重要技术基础与支撑.     

面向磁约束聚变实验的先进中子发射谱仪诊断的研究

本文评述了EAST和HL－2A托卡马克装置上开展的聚变发射中子谱仪研究的进展．面向等离子体物理研究和ITER装置中子诊断技术发展的最新需求,针对EAST和HL-2A托卡马克装置的低中子产额（10^9-10^11s^-1）场,设计和发展了全数字化的液体闪烁谱仪和芪晶体中子谱仪．进行了EAST和HL-2A放电实验聚变中子产额随时间演化规律的研究,开展了HL-2A装置上NBI辅助加热效果的评估和EAST聚变等离子体锯齿震荡的中子通量诊断．使用液体闪烁谱仪和芪晶体中子谱仪测量实现了EAST放电的芯部聚变离子温度诊断,首次将托卡马克装置实验中子能谱直接诊断离子温度的下限推到1keV以下．在EAST装置上建设的双环式球形阵列中子飞行时间谱仪将为托卡马克装置辅助加热和快离子物理研究打下坚实的基础．     

我国“人造太阳”达到1亿度!

<正>2018年10月,中科院等离子所宣布,安设在合肥的全超导托卡马克核聚变实验装置"东方超环"(EAST)在当年度实验中,等离子体中心电子温度达到1亿度(108K)。东方超环是我国自主设计的第四代核聚变实验装置,也是世界上第一座全超导托卡马克,在2017年曾创下高约束模等离子体运行101.2秒的世界     

中国环流器二号A装置首次达到近堆芯条件

2005年12月,由核工业西南物理研究院成功建造的我国第一个具有偏滤器位形的托卡马克装置——中国环流器二号A装置,首次达到近堆芯条件;2006年2月,该装置运行参数达到:等离子体电流400 kA,纵向磁场2．65 T,等离子体存在时间2960     

中国"太阳"冉冉升起

在我国,核工业西南物理研究院和中科院等离子体研究所是进行磁约束核聚变研究的两大重镇.前者进行的是常规托卡马克研究,后者主要是超导托卡马克研究. 20世纪80年代,西南物理研究院建成了托卡马克装置--中国环流器1号.2002年12月,又建成了中国环流器2A,它属于国家大科学工程.     

HT-7装置中低杂波电流驱动时的电子温度

在HT-7托卡马克实验装置中采用低杂波电流驱动,在不同低杂波功率和电子密度(ne)下,考察中心电子温度和能量约束时间的变化。观察到当ne=1.3×1019~2.6×1019m-3时,中心电子温度随低杂波输入功率的增大而升高;当ne=1.3×1019m-3,低杂波输入功率为400 kW时,电子温度最高,达到1.37 keV。在本实验参数范围内,其能量约束时间与ITER89-P L-模定标率十分吻合。比较欧姆加热和低杂波加热下的电子温度分布,当ne=1.71×1019m-3,低杂波输入功率为260 kW时,电子温度有明显的温度梯度出现。     

HL-2A托卡马克等离子体中的离散阿尔芬本征模

在HL-2A装置上,运用磁流体力学数值模拟程序,探究了在低杂波辅助加热放电方案中,低杂波能量沉积区域内的离散阿尔芬本征模(αTAE,α是等离子体压强梯度的标度)的物理特征;探讨了不同等离子体剖面下,αTAE的分布情况.运用线性回旋动理学和磁流体力学混合模拟程序,研究了中性束注入不同能量的粒子对αTAE的影响;另外,还探究了能量沉积区域内的αTAE被高能量粒子激发成不稳定性的物理特征.通过模拟发现,在该装置上α的值相对较小,αTAE主要分布在负磁剪切区域.在低杂波能量沉积区域内伴有丰富的αTAE,且低杂波能量沉积量越大,αTAE频率越高.此外,在不同等离子体剖面下,大量αTAE被束缚于沿HL-2A托卡马克小半径方向上的不同区域.随着中性束注入粒子能量逐渐增大,αTAE的多支模也被激发成不稳定模式,这种不稳定模式潜在影响托卡马克对等离子体的约束性能.     

“东方超环”创两项世界纪录

正本刊讯近日,被称为"人造太阳"实验装置的东方超环(EAST)超导托卡马克2012年物理实验顺利结束,创造了两项托卡马克运行的世界纪录:获得超过400秒的2000万度高参数偏滤器等离子体;获得稳定重复超过30秒的高约束等离子体放电,标志着我国在稳态高约束等离子体研究方面走在世界前列。高参数、高约束模式偏滤器等离子体是未来聚变托卡马克放电的最基本运行方式。     

HL-2A装置中的电子回旋波电流驱动

 通过将相对论Fokker Planck方程与波迹方程联合求解,对HL-2A装置中的电子回旋波电流驱动进行了数值模拟,研究了在HL-2A单零偏滤器条件下,中平面弱场侧发射的电子回旋波寻常波电流驱动。结果表明,HL-2A中的电子回旋波电流驱动效率较低并且受温度影响较为明显。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

正~~