实验物理与工业控制系统平台在HL-2A主机测控系统中的应用

描述了利用实验物理与工业控制系统(EPICS)平台对HL-2A主机运行参数进行的集中测控系统开发。系统采用s7nodave设备驱动模块,实现了Soft IOC与各PLC的通讯,将各子系统的PLC集成到了EPICS控制系统中。通过对关系型数据库和应用层软件CSS中数据归档及报警等组件的扩展与配置,实现OPI层与各个子系统的实时通信。测控系统成功地将HL-2A主机参数集中在EPICS平台下运行,为下一代装置的主机集中测控系统设计打下了基础。     

高离化态氩离子产生的Kα和Kβ谱线的相对论理论研究

利用多组态Dirac-Fock方法,系统研究了不同离化度氩离子的Kα和Kβ线的结构以及内壳层旁观洞态和高n旁观电子对其结构的影响.结果表明:剥离1s、2l壳层电子而引起的Kα和Kβ线的“紫移”要强于剥离3l壳层电子的;最内层的1s旁观洞态产生的伴线与Kα和Kβ线离得较远,而较外层的2l、3l伴线与Kα和Kβ线基本重合在一起;3pnl-1snl和2pnl-1snl(n=3…6;l=0…5)类型跃迁产生的伴线的形状和位置随nl的增加逐渐接近Kα和Kβ线.     

内壳层电子激发(电离)诱发的电子波函数的弛豫及其对辐射跃迁概率的影响

利用多组态Dirac_Fock(MCDF)理论方法，通过对Ar原子在基组态3p⁶和激发组态1s^-14s，2s^-14s，2p^-14s，3s^-14s，3p^-14s情况下电子波函数的计算，系统地研究了不同内壳层电子激发(或电离)引起的电子波函数的弛豫现象以及由此导致的k_α和k_β线的跃迁波长和概率的变化情况，并与以往的理论结果进行了比较. 关键词： MCDF方法 弛豫效应 电子波函数 跃迁概率     

HL-2M 装置真空烘烤控制系统概述

HL-2M 真空烘烤系统采用两台可编程逻辑控制器(PLC)构成一个自动控制系统,根据工艺要求编制 相应逻辑程序来控制各执行机构,实现对系统加热器电功率、换热器热负荷以及阀门开度的程序调节,达到±2℃ 温升梯度的烘烤目的。PLC 与阀岛建立工业以太网(Profinet)通信协议,通过地址映射的方式控制进出真空室和偏 滤器的开关阀,调整烘烤系统的负载投入。     

低能离子注入小麦种子胚内的射程分布

采用110keV56Fe1+离子束垂直注入小麦种胚后,将小麦沿腹面的纵沟掰开,形成剖面,将剖面水平朝上粘贴在金属铜托上,用扫描电镜在剖面上从胚表面向纵深进行点分析,测定不同深度上由Fe元素激发出的特征X射线强度,由此得到了该种离子注入小麦胚内的最大射程约5μm,最可几射程为0.935μm.并对这种低能离子注入作物种子能诱发突变的机理进行了详细讨论. After embryo of wheat seed was right implanted by 110 keV 56Fe1+ions, the seed was broken into two parts by hand along its abdomen trench to form two cross sections. A half seed was pasted on a metal holder in keeping the cross section upwards horizontal. Spot analyses were carried out from embryo surface towards depth on the cross section under SEM and the intensity of characteristic X rays induced by electrons in Fe elements of the embryo was measured. From this, the maximum range of the ionsi...     

Am原子及其离子Amq+(q=1~6)的K,L,M-X射线跃迁能和跃迁几率的理论研究(英文)

使用基于Dirac-Hartree-Fock方法的Grasp2K程序包,计算了Am原子及离子的K,L,M-X射线的跃迁能和跃迁速率。在计算中,包括了Breit相互作用、真空极化和自能等重要效应。目前研究结果与已有的其他实验和理论结果相对误差约为0.04%。此外,我们还首次计算了从Am1+到Am6+离子的K,L,M-X射线的跃迁能和跃迁速率。相对于中性原子,来自低离化态的跃迁能相对于中性的相应跃迁线的能量仅有轻微的偏移,这反映出外层电子几乎不影响内壳层的跃迁性质。Transition energies and rates of K, L, and M X-ray lines from electric-dipole transition of americium have been calculated using GRASP2K code based on the Dirac-Hartee-Fock method. The effects of the Breit interaction, vacuum polarization and self energy were taken into account. It is found that the present results agree within 0.04% with other experimental and theoretical values. Furthermore, we also calculated transition energies and rates of the K-, L-, and M-shell hole states of americium ions with charge states Am1+-Am6+ for the first time. It is found that the transition energies and rates change slightly relative to the corresponding results of americium atoms, which indicates that the outermost electrons can hardly affect inner-shell transition properties.     

碳离子辐照细胞的相对生物学效率

研究了传能线密度(LET)≥125.5keV/μm的碳离子辐照小鼠黑色素瘤B16、人的宫颈癌HeLa、中国仓鼠肺V79、人的肝癌SMMC-77214种细胞的相对生物学效率(RBE).得到了当LET=125.5keV/μm时,RBE依赖于细胞种类并随细胞存活水平的升高而增加的关系,以及当LET≥125.5keV/μm时,RBE随着LET的增大而变小的关系.     

类Ne等电子系列离子(Z=11,…,18)2p~53s—2p~6辐射跃迁的多组态相对论理论计算

利用多组态DiracFock(MCDF)理论方法,系统研究了延迟、相关和相对论效应对类Ne等电子系列离子(Z=11,…,18)的较低的激发组态2p53s和基组态2p6的能级结构及其能级之间辐射跃迁特性的影响.给出了2p53s1,3P01—2p61S0电偶极(E1)共振和复合跃迁、2p53s3P02—2p61S0磁四极(M2)跃迁和2p53s3P00—2p53s3P01磁偶极(M1)跃迁的跃迁能以及激发态1P01,3P00,3P01,3P02的辐射寿命,所得结果与最新实验观测和其他理论计算进行了比较 关键词： MCDF方法 延迟和相关效应 跃迁概率     

High-throughput computational material screening of the cycloalkane-based two-dimensional Dion—Jacobson halide perovskites for optoelectronics

Two-dimensional (2D) layered perovskites have emerged as potential alternates to traditional three-dimensional (3D) analogs to solve the stability issue of perovskite solar cells. In recent years, many efforts have been spent on manipulating the interlayer organic spacing cation to improve the photovoltaic properties of Dion—Jacobson (DJ) perovskites. In this work, a serious of cycloalkane (CA) molecules were selected as the organic spacing cation in 2D DJ perovskites, which can widely manipulate the optoelectronic properties of the DJ perovskites. The underlying relationship between the CA interlayer molecules and the crystal structures, thermodynamic stabilities, and electronic properties of 58 DJ perovskites has been investigated by using automatic high-throughput workflow cooperated with density-functional (DFT) calculations. We found that these CA-based DJ perovskites are all thermodynamic stable. The sizes of the cycloalkane molecules can influence the degree of inorganic framework distortion and further tune the bandgaps with a wide range of 0.9—2.1 eV. These findings indicate the cycloalkane molecules are suitable as spacing cation in 2D DJ perovskites and provide a useful guidance in designing novel 2D DJ perovskites for optoelectronic applications.     

HL-2M装置偏滤器冷却系统设计与分析

建立了HL-2M装置偏滤器水冷流道的等效三维模型,模拟分析了冷却水系统负载的温度和压降.构建了冷却系统的一维流体模型,分析了冷却系统工程设计的水力参数,并与模拟结果进行了比较,结果符合得较好.