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D-~3He商用堆工作物理参数的空间分析 总被引:1,自引:0,他引:1
邓柏权 《核聚变与等离子体物理》1993,(2)
由于D-~3He聚变堆不要求厚的包层和大的内侧空间,中子壁负载小得多,第一壁几乎是永久性的,维修更换问题减轻。采用低径比有利于电流驱动和较大的等离子体变形和好的垂直稳定性,以便得到大的等离子体电流,因而得到高的β和好的约束。本文从目前普遍采用的堆芯等离子体物理规律为基础,编制了DHE3TOK程序。研究了以D-~3He为燃料,低径比A=2.5工作在第一稳定区的商用堆特点。对它的工作物理参数空间范围进行广泛调查的基础上,提出了需要研究和发展的关键工程技术问题。 相似文献
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最近,来自日本东京大学的Yamaguchi A等,对自旋极化超流3^He的A1相,进行了喷泉效应实验研究.不过,实验者不是用温度梯度,而是用磁场梯度诱发喷泉压差.3^He原子不同于4^He,费米原子3^He要想凝聚到单一的最低能态,必须首先两两配对.液态3^He发生超流转变的温度只有几mK,并且依温度和压力超流体又被分为A,B和A1三个相。 相似文献
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赵健张斌王志强司高华富宝锋 《低温物理学报》2017,(6):51-54
低温下的~4He系统由于全同粒子交换作用呈现超流等宏观量子效应,交换效应对系统能量的影响尚不明确.本文基于路径积分蒙特卡罗方法计算了不同温度下~4He系统的平均动能以及平均势能.考虑交换效应时,~4He的平均动能增大,但是动能增大幅度不随温度的降低而升高,对关联函数等结构表征几乎不变,势能变化不明显. 相似文献
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D—^3He聚变动力可行性研究 总被引:9,自引:3,他引:6
本文首先简要地讨论D-3He聚变的物理要求并与D-T聚变作相应的比较,然后运用目前的约束定律和第一稳定区β极限,对计划的近期ETR规模装置(如CIT,TIBER,FER,NET)进行D-3He得失相当和点火实验的可行性研究,并对高径比第二稳定区D-3He托卡马克堆进行参数学研究,最后指出潜在的缩短商用化进程可能性。 相似文献
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原子核自旋极化的~3He气体已被深入研究并广泛用于各种科学实验.在过去的极化~3He实验中,为了减小磁场梯度对纵向弛豫时间的影响,通常会建造大尺寸的亥姆霍兹线圈来提供所需均匀度的主磁场环境.本文通过计算得到了新的六正方形线圈系统,可以为极化~3He实验提供小型高均匀性的磁场装置.其中线圈系√统内部超过30%的区域磁场梯度满足(|▽B_x|~2+|▽B_y|~2)/B_0 10~(-4)cm~(-1),这一均匀区域比例超过了现在所有用于极化~3He实验的线圈装置.对于其他需要大均匀区域磁场环境的研究实验,新的六线圈系统也具有很好的应用价值. 相似文献
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等离子体理论—用球形托卡马克建立D-^3He聚变反应堆的可能性 总被引:1,自引:0,他引:1
石秉仁 《核工业西南物理研究院年报》2004,(1):86-88
最近几年,在磁约束聚变研究中,一类新的途径,即叫做球型托卡马克或叫做球形环的途径,取得了重要的进展,同时,托卡马克继续取得进展,国际热核实验反应堆计划(ITER)已进入实施阶段。在球形环实验中,经常可以达到高达50%以上的磁流体稳定的比压值。球形环的约束定标关系,虽然不如托卡马克那样具有庞大的数据库,但看起来也不比托卡马克差。于是,基于D及^3He之类先进燃料的聚变反应堆的兴趣有所回升,因为这类反应堆产生的高能中子的数量要小很多,后者对第一壁的损伤使得壁材料问题成为一个很困难的问题。本文利用ITER设计中公认的定标律及运行参数窗口来探讨建立基于球形环概念的D和^3He燃料的聚变反应堆的可能性。 相似文献
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对加少量氚的D-3He聚变系统的点火燃烧过程进行了数值模拟研究,得到了有关的物理图象和一些主要计算结果。研究结果表明,加少量氚可以解决D-3He聚变系统的点火问题和加速其燃烧过程,从而提高燃耗。 相似文献
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3He作为一种特殊的工质在低温工程、基础物理学和空间技术等领域获得重要应用,这些应用需要可靠的3He热力学性质数据。但是目前没有适用于3He的宽范围状态方程。不仅如此,而且有关的热物性实验数据也十分稀缺,这给应用3He的研究人员带来了困难。本文基于全面收集和整理有关3He的各类数据,通过编写计算机程序,考察了五种常用的状态方程(理想气体状态方程,范德瓦尔方程,RK方程,RKS方程和PR方程)用于计算3He在4K~100K温区定压下比容-温度关系的可行性,并将计算结果与实验数据进行了比较。这些比较结果将为3He状态方程的研究提供有价值的参考。 相似文献
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A. M. R. Schechter R. W. Simmonds R. E. Packard J. C. Davis 《Physica B: Condensed Matter》2000,280(1-4):132-133
We recently reported observation of third sound resonances in superfluid films of pure 3He on a disk-shaped polished copper substrate. From the observed spectra of resonant modes, the third sound speed, the average superfluid density, and information on dissipation were obtained. The film thicknesses studied were larger than or comparable to the superfluid coherence length, which is near 100 nm. We describe preliminary results from efforts aimed at using third sound in thinner films on a substrate which has been coated with a few atomic layers of 4He. 相似文献
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W.C. Chen R. Erwin J.W. McIver III S. Watson C.B. Fu T.R. Gentile J.A. Borchers J.W. Lynn G.L. Jones 《Physica B: Condensed Matter》2009,404(17):2663-2666
At the NIST Center for Neutron Research (NCNR), we have applied 3He neutron spin filters (NSFs) to the instruments where 3He NSFs are advantageous, such as thermal triple-axis spectrometry, small-angle neutron scattering, and diffuse reflectometry. We present the status of our development and application of this method, including polarized gas production by spin-exchange optical pumping, magnetostatic cavities for storage of the polarized gas on the beam line, and nuclear magnetic resonance (NMR)-based, on-line monitoring and reversal of the 3He polarization. We present the status of developing user-friendly interfaces incorporated into the instrument software to handle these 3He neutron spin filters while taking data and performing data analysis. Finally we discuss the status of development of a polarization capability on the multi-axis crystal spectrometer, which requires polarization analysis over a 220° angular range. 相似文献
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首先简述了He离子注入单晶Si引起的气泡形成、生长以及其它缺陷对其生长的影响,介绍了Si中He气泡生长的可能微观机制以及它们在现代半导体技术中潜在的应用前景,提出了该领域研究有待解决的关键问题.He ion implantation induced bubbles or cavities in silicon have been paid more and more attentions due to their potential applications in modern semiconductor technology. In this paper, He ion implantation induced formation and growth of bubbles in silicon together with their interactions with other defects were first briefly reviewed. Then the possible growth mechanisms of He bubbles in silicon and their potential applications in modern semiconductor technology were described. Finally, we presented the ke... 相似文献
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We investigate the excitation spectra of closed-shell 3He droplets using a flexible formulation of the RPA which has been presented in preceeding papers. The calculations are based on an energy functional which thorougly employs finite-range interactions. We compare the results for different stages in a hierarchy of approximations to the full RPA. We furthermore discuss the consequences of taking the zero-range limit of the present energy functional, i.e. of using Skyrme-type interactions. 相似文献
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P. G. N. deVegvar 《Journal of statistical physics》1985,39(5-6):675-685
After introducing the physics of sound propagation in normal and superfluid3He, nonlinear phenomena are discussed. These bear close resemblance to optical effects, including saturation of the absorption, amplitude dependence of the group velocity, pulse break-up, and pulse compression. Preliminary evidence indicates that above an input power threshold the sound pulses propagate in a solitonlike fashion. A naive sine-Gordon model does not explain the observations. 相似文献
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The design of a simple and inexpensive3He insert for the existing ac susceptometer is described. The system uses a home built mutual inductance bridge for the ac
susceptibility measurements from 0·4 K to 300 K. Simple and inexpensive design with the top loading facility are the main
features of this set up. The insert can also be used as a continuously3He operating refrigerator down to 0·5 K. 相似文献
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Hiroki Ikegami Ryuichi Masutomi Ken Obara Hidehiko Ishimoto 《Physica B: Condensed Matter》2000,280(1-4):102-103
Nuclear magnetization has been measured with NMR down to temperatures around 0.1 mK for sub-monolayer solid 3He formed on graphite preplated with two layers of HD. The data for the
commensurate phase show no evidence of a magnetic transition and a rather slow increase of the magnetization even at ultra-low temperature (0.15 mK), much lower than the antiferromagnetic exchange interaction of −6.3 mK. 相似文献