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。     

利用直流辅助凸轨设计HLS注入系统研究

合肥同步光源的现有注入凸轨由3块冲击磁铁产生,不同的运行模式具有不同的凸轨.为了改变这种凸轨参数与储存环参数的相互依赖,提出采用集中布局的方案,即在注入长直线节形成注入局部凸轨.由于HLS的注入长直线节很短,需要冲击磁铁为束流提供较大的偏转角度.为此,本文研究了采用辅助直流凸轨的方案,以减小对冲击磁铁强度的要求,并分析该注入系统对储存环动力学孔径的改善.     

Studies on Electronic Structure and Magnetic Properties of an Organic Magnet with Metallic Mn^2＋ and Cu^2＋ Ions

The electronic structure and the magnetic properties of the non-pure organic ferromagnetic compound MnCu(pbaOH)(H2O)3 with pbaOH=2-hydroxy-1, 3-propylenebis (oxamato) are studied by using the density-functional theory with local-spin-density approximation. The density of states, total energy, and the spin magnetic moment are calculated. The calculations reveal that the compound MnCu(pbaOH)(H2O)3 has a stable metal-ferromagnetic ground state, and the spin magnetic moment per molecule is 2.208 μa, and the spin magnetic moment is mainly from Mn ionand Cu ion. An antiferromagnetic order is expected and the antiferromagnetic exchange interaction of d-electrons of Cu and Mn passes through the antiferromagnetic interaction between the adjacent O, 0, and N atoms along the path linking the atoms Cu and Mn.     

The effect of Pd doped in Ru layer on theinterlayer coupling in Co／RuPd multilayers

2.0nmCo/tnmRu层间反磁铁耦合 磁性录音 振动交换 添加效应2.0nmCo/tnmRu1-xPdx multilayers with x=0, 0.05, 0.08, 0.24, 0.39 and 0.48 were prepared by magnetron sput-tering. The spacer layer thickness of both Ru (before doping Pd) and RuPd (after doping Pd) varies from 0.2nm to 1.6nm. Two effects have been investigated: (1) the dependence of the interlayer coupling on the thickness of Ru1-xPdx as a function of x and (2) the dependence of the interlayer coupling on Pd doping density, x, as a function of thickness of Ru1-xPdx. Our results indicate that the interlayer coupling is strongly dependent on the doping density and the spacer layer thickness. The saturation field Hs increases when very low concentration of Pd doped in the Ru layers and a suitable spacer thickness are adopted.     

电感耦合等离子体发射光谱(ICP-OES)法测定钕铁硼磁体中铅含量

采用硝酸消解处理钕铁硼磁体,以基体匹配法建立了电感耦合等离子体发射光谱(ICP-OES)法测定钕铁硼中铅含量的方法,研究了仪器的工作条件和分析波长。结果表明,工作曲线的线性相关系数为0.999 93,方法检出限为0.009μg/mL,加标回收率达到104%,相对标准偏差小于3%。方法检出限低,满足实际检测需求,可以快速准确方便地测定钕铁硼中铅含量。     

提高速凝铸带母合金制备的烧结钕铁硼磁体磁性能的研究

通过对速凝带钕铁硼母合金制备烧结钕铁硼永磁体后续工艺的研究，发现对速凝带进行900℃等温热处理，200℃和0．1MPa条件下氢破碎，可以有效地提高磁体的性能，改善退磁曲线的方形度。     

Magnetic Properties of Exchange-Coupled Dual-Layer SmTbCo Thin Films

Exchange-coupled SmTbCo dual-layer media are prepared by an r.f magnetron sputtering system and their magnetic properties are investigated. The prepared SmTbCo dual layer is composed of a 340 emu/cm^3 TM-rich readout layer and a 5.80 kOe RE-rich memory layer, meeting the requirements of high saturation magnetization and large coercivity for hybrid recording. Through exchange coupling, the coercivity of the high-saturation- magnetization SmTbCo layer is greatly enhanced from 1.85 to 5.96 kOe. The calculated interface wall energy for Sm6.65Tb12.35Co81 （20nm）/Sm1.22Tb42.16Co56.62 （20hm） is about 3.85erg/cm62. The reversal magnetization of the SmTbCo exchange-coupling dual-layer films is analysed based on a micro-magnetic model.     

上海光源低温波荡器永磁铁在低温下的磁特性研究

用综合物性测量系统测试了国产Nd₂Fe₁₄B (N50M)永磁铁在低温下(10–300 K)的M-H和M-T. 获得了N50M剩磁B_r和内禀矫顽力H_ci在低温下的变化图, 对其取向度和三维磁化强度进行了分析研究. 结果表明, N50M在80–150 K发生强烈自旋再取向效应, B_r在120–130 K出现峰值, H_ci随温度下降呈线性增加. 在130 K, B_r和H_ci分别比常温(300 K)增加15.6%和220%, 达到1.65 T和3638 kA/m. 在150–300 K, 随温度下降, N50M宏观取向度与外磁场均匀性逐步改善, 但在80–235 K, 微观外磁场均匀性恶化.实验研究发现, 235 K附近, N50M垂直取向方向呈现“剩余磁化强度跳跃”. 研究结果为上海光源Ⅱ期低温波荡器及其他高精度低温永磁仪器与设备的物理设计提供了参考. 关键词： 低温波荡器 2Fe₁₄B永磁铁')" href="#">Nd₂Fe₁₄B永磁铁 低温 磁特性     

兰州重离子加速器冷却储存环kicker磁铁设计

 介绍了兰州重离子加速器冷却储存环（HIRFL-CSR）CSRm引出kicker磁铁的物理设计、参数计算以及结构设计和加工。为了减小电感,使上升时间达到要求,CSRm引出kicker磁铁采用分布式的传输线方案,同时将无感电容与磁铁并联以满足匹配的问题。磁铁用单匝线圈和铁氧体铁芯来降低电感、减少涡流损耗,并采取两台电源成对供电、导体一端共地的结构形式消除杂散电感和轴向场,这种方式不但消除了过桥的不利影响,而且可通过调节导体间距离方便的调节磁场均匀区宽度和磁铁电感。完成设计后磁铁电感小于1 μH,在140 mm范围内磁场均匀度好于±0. 5%,最高磁场达到0.038 T,最大峰值激磁电流约为2.5 kA。     

Lambertson型切割磁铁漏场的3维模拟计算和优化设计

 Lambertson型切割磁铁的漏场对RCS中的束流运行有较大的影响,包括束流集体不稳定效应以及高阶共振效应,为了对该型磁铁进行优化,利用3维磁场模拟程序OPERA3D/TOSCA,对北京散裂中子源/快循环同步加速环（CSNS/RCS）引出Lambertson型切割磁铁进行了物理设计。通过对不同的磁铁设计方案进行3维模拟计算和优化发现,采用15 mm厚的切割板以及在屏蔽管出口处添加半径为200 mm、厚度为10 mm屏蔽帽的磁场屏蔽措施,将Lambertson型切割磁铁的横向漏场降低到主磁场的0.80‰（y方向）和0.36‰（x方向）,可以满足CSNS/RCS环的束流动力学设计要求。