新一代磁体的开发

通过气相－固相反应，将间隙原子（Ｎ，Ｈ，Ｃ，Ｏ）引入４ｆ－３ｄ金属间化合物中，使后者的内禀特性发生根本改变，从而得到性能优良的新一代磁体．这是磁体开发的最新动向，Ｓｍ２Ｆｅ１７Ｎ３－σ的出现就是最好的例证．本文除详细介绍这方面的最新进展外，并从磁性材料发展的角度，评述了与此有关的Ｆｅ１６Ｎ２的发现，也提及气相－固相反应的运用实例──ＨＤＤ工艺．     

中国散裂中子源旋转线圈测量系统研制

中国散裂中子源(CSNS)加速器主要由一台直线加速器、一台快循环加速器以及低能、高能输运线组成。针对CSNS加速器部分直流磁铁研制了一套旋转线圈测量系统。对系统的研制方案、功能、精度、完成的磁铁类型以及部分测量结果进行介绍。该系统解决了CSNS批量磁铁之间的不同中心高度、质量、有效长度、磁场强度的兼容性难题。经过测试运行,积分场测量重复性误差好于±0.02%,空间谐波重复性误差好于0.005%,磁中心测量重复性误差好于±0.03 mm,顺利完成了中国散裂中子源工程150台多种类型磁铁的检测任务。     

圆形加速器的注入和引出技术

圆形加速器中的注入引出通常是关键性的系统, 它们在从一个加速阶段到另一个加速阶段或从加速器到实验系统的束流传输中起到重要作用. 注入引出区通常也是发生较大束流损失的地方. 受制     

运动磁铁场中的电磁感应

本文用狭义相对论讨论运动磁铁场中金属棍内的电磁感应现象，分析观察者测得的电场的起源和性质，介绍“表观电荷”的概念，并从路的角度对棍中的感应现象进行分析．     

混合型插入件的三维场形分析和计算

本文根据“均匀磁化”原理,对永磁直线阵列周期系统──混合型插入件(Hybrid Insertion Devices)的三维场形进行了分析,得到了近似的三维解析表达式.运用这些关系式可以计算混合型结构的永磁插入件的三维场形.这个简单、有效的解析计算方法,有助于永磁插入件的优化、设计.     

Coulomb Interaction in Quantum Dot with a Precessing Magnetic Field

We study electronic transport through a quantum dot （QD） with a precessing magnetic field. By using the Keldysh nonequilibrium Green function method, formulas of local density of states （LDOS） and conductance of QD are derived self-consistently. It shows that the LDOS and conductance have obvious changes with the Coulomb blockade interaction. The intensity and angle of the magnetic field or temperatures, which reflect the mesoscopic structure of the QD are derived. The superiority of this device is that the QD can be controlled easily by the magnetic field, so it is valuable to apply in generating, manipulating and probing spin state.     

合肥光源储存环注入凸轨系统满能量注入可行性研究

 合肥同步辐射光源现有的注入系统采用1/4能量注入。二期工程改造后,注入系统采用集中布局方案。以改造后的机器为基础,针对合肥同步辐射光源的两组运行模式,探讨实现满能量注入的可行性和实施方案。     

单向扫描磁铁边界形状对性能的影响

本文研究单向扫描磁铁出口边界形状对扫描性能的影响.适当改变出口边界形状可以改善磁铁的扫描均匀度,并减少不利的磁铁聚焦作用.     

Quantum transport through two series Aharonov--Bohm interferometers with zero total magnetic flux

With the help of nonequilibrium Green's function technique, the electronic transport through series Aharonov--Bohm (AB) interferometers is investigated. We obtain the AB interference pattern of the transition probability characterized by the algebraic sum \phi and the difference \theta of two magnetic fluxes, and particularly a general rule of AB oscillation period depending on the ratio of integer quantum numbers of the fluxes. A parity effect is observed, showing the asymmetric AB oscillations with respect to the even and odd quantum numbers of the total flux in antiparallel AB interferometers. It is also shown that the AB flux can shift the Fano resonance peaks of the transmission spectrum.     

用于微波电子枪注入器的α磁铁的设计和制造

本文给出用于北京自由电子激光器的微波电子枪注入器的α磁铁的物理参数和物理设计,并报告了磁场测量的结果:好场区范围13.3cm;场梯度均匀度1.5%.经模拟计算和束流实验证明,这块α铁的设计和制造满足了微波电子枪高亮度注入器的要求.     

Configurations, Electronic Structure and Magnetic Ordering of Small Manganese Clusters

We investigate the configurations, electronic structures, and magnetic ordering of MnN （N = 2-13） clusters based on all-electron density functional theory. The Jahn-Teller effect plays an important role in determining the ground state of certain geometries. The magnetic ordering of the MnN dusters transits from ferromagnetic ordering for the smallest （ N = 2, 3） dusters to a near degeneracy state including ferromagnetic and ferrimagnetic ordering in the vicinity of N = 4-6 and to a clear ferrimagnetic ordering at N = 7 or beyond. N = 6 and 10 are the magic numbers for neutrai MnN （N = 2-13） dusters.     

Characterization and Magnetic Properties of Iron-Based Alloy Antidot Arrays

Fe29Cerl and Fe19Ni81 antidot arrays, with different dimensions, are prepared with the rf magnetron sputtering method onto the porous alumina substrate. The size and shape of antidot arrays are characterized by scanning electron microscopy. The glancing angle x-ray diffraction patterns of Fe29C071 and FelgNi81 antidot arrays indicate the bcc and fcc structures, respectively. The coercivities of both the alloys show abnormal thickness dependence, which are discussed qualitatively by considering the pinning and the thickness effect to the films.     

全Nb3Sn12T净孔径Ф36mm密实型超导磁体

本报道用超导线共计１１ｋｇ的三个Ｎｂ３Ｓｎ分磁体组合成的净孔径Ф３６ｍｍ，中心场强１２Ｔ的超导磁体。该强场超导磁体的特点是：体积小，重量轻，耗氦少，且可拆卸重新组合，以不同的孔径和中心场强多用途使用。     

北京谱仪磁铁磁轴测量分析

本文着重论述了用移动线圈法测量北京谱仪磁铁磁轴的基本原理、测量方法和测量结果,为北京谱仪的正常运行提供了基本数据.