Progress on the Lanzhou Penning Trap

The Penning trap is one of the most important experimental devices in the field of nuclear physics, and measures atomic masses with the highest precision in the world. Many such devices are currently in operation, with more being designed and constructed. To start the experimental study of atomic masses with very high precision in China, the Lanzhou Penning Trap (LPT) is being constructed at the Institute of Modern Physics, Chinese Academy of Sciences. In this paper the progress and status of the LPT will be reported.     

A Non-neutral Plasma Device: Electron Beam Penning Trap

1.IntroductionPenningtrapshavebeenwidelyusedtotrapchargedparticles,suchaselectronsorions,forstudyonthefundamentalpropertiesofparticles,andthetransportandequilibriumpropertiesofnon--neutralplasmas[1-4].InaPenningtrap,auniformaxialmagneticfieldprovidesradialconfinement,whiletheelectricfieldbetweentheelectrodesprovidesaxialone.Thetrapcanconfineasmallnumberofchargedparticlesforverylongtime.However,becauseoftheself-electricfieldeffect,themaximumdensityofnonneutralplasma(electron)radicallyconfinedb…     

中子管内潘宁离子源的建模与控制

由于中子管内离子源电流滞后于储存器电流,导致离子源电流的调节速度和稳定性不够高,进而影响中子产额的稳定性。本文在分析大量实验数据的基础上,建立了中子管离子源的数学模型,设计出相应的PID控制算法。经测试表明：所构建的离子源模型与实际离子源工作情况符合较好,改进的控制算法能减少稳定离子源电流所需时间,提高中子产额的稳定性。     

A Penning Discharge Ion Source for High Brightness

The development, characteristics and emittance of the Penning discharge ion source used in the Cosmotron injector are described. The maximum value of brightness reported is 3 × 1012 mA cm-2 rad-2 at 78 mA total current, 23 keV beam energy. The results are superior to recent values for duoplasmatrons from various laboratories, except for total current.     

A Penning Ion Source for Multiply Charged Ions

The ion source described in this contribution allows the production of considerable ion beam intensities of highly charged ions. The electron density is increased by an additional electron gun. The decrease-of the ratio of neighbouring charge states is similar to the decrease of the ratio of the ionization cross sections by electron impact from which one event ionization processes are assumed to be of major importance in the performance of this source.     

"全国天然辐射照射与控制研讨会"介绍

1会议概况 在国家环境保护总局、科技部、卫生部、国土资源部、国防科工委、国家经贸委、建设部和中国核工业集团公司等部门及单位的指导、关怀和支持下,由中国核学会辐射防护学会、中国地质学会、中国地球物理学会环境地球物理专委会、中华医学会放射医学与防护学分会、中国环境学会大气环境分会、环境监测分会、中华毒理学会放射毒理专委会、中国核学会铀矿地质学会、铀矿冶学会、中华预防医学会放射卫生分会、中国石材工业协会、中国建筑装饰协会石材专委会等12家学会(协会)联合组织的"全国天然辐射照射与控制研讨会"于11月27日到12月2日在北京西郊宾馆成功召开.     

兰州重离子加速器监测系统软件设计

基于已存在的分布式控制系统，采用客户／服务器模式研制开发了兰州重离子加速器(HIRFL)电源设备自动巡检报警和束流状态显示的监测系统软件。介绍了该系统的整体结构及软件设计。     

重离子治癌加速器高速实时数据传输系统研制

分析了重离子治癌专用加速器对部分同步数据和过程数据的传输要求,提出并实现了一种高速率、可纠错、远距离的实时数据传输系统,以提高加速器同步和控制的效率和可靠性。系统优化了传统系统的硬件配置和布局。采用PXI、FPGA、SDRAM与远距离千兆光纤模块相结合的系统构架,替代了原数据传输过程中低速、近距离、抗干扰性不强的数据通路和处理器件。软件上,通过对两片FPGA的编程,在系统后端实现了PXI接口和DMA相结合的方式与加速器服务器进行数据交互;在系统前端实现了800 MHz载波100 MHz基带信号的实时、远程、高速串行帧传输。通过该数据传输系统,保证新加速器系统的同步事例、电源波形等实时数据在服务器和远端控制器之间的高效传输。     

兰州放射性次级束流线数据获取系统的改造

为兰州放射性次级束流线(RIBLL)实验需求升级改造1套基于PC Linux的数据获取系统。系统采用PCI-CAMAC总线标准，CAMAC插件与计算机间的通讯通过CC32机箱控制器和PCIADA卡来实现。数据在线分析程序可直接连接CERN的PAW/ROOT分析平台。经多次实验检验，系统工作稳定可靠，最大数据获取速率达到了930KB/s。     

用于石油测井中子管的微型潘宁源的研制

为适应新一代石油测井中子管对小型化、稳定性好的离子源的要求,研制设计了一种阳极简直径为10mm的冷阴极潘宁离子源。通过优化结构设计、合理设计电磁场和屏蔽电磁场的干扰,此离子源应用于石油测井中子管具有放电电流稳定、中子产额高、工作性能好的特点,经实践证明能满足新一代石油测井中子管对离子源的要求。     

氢计钠回路冷阱净化系统设计和调试

液态金属钠冷决快堆电站蒸汽发生器的钠泄漏会导致钠水反应和氢的产生。因此，钠中微量氢的探测是判断汽发生器中是否存在钠泄漏的重要手段，是确保快堆电站安全运行的关键问题之一。清华大学液态金属技术研究室建立了服务于钠中微量氢探测的氢计钠回路。为了准确测量 ，需要确保回路中的纯度，尤其是氢的含量应加以严格控制。在氢计的钠回路中，利用钠温降低后，钠中杂质含量降低的原理，达到去除中杂质的目的。     

Essential Characteristics of Plasma Antennas Filled with He-Ar Penning Gases

Based on the essential theory of Penning gases,the discharge characteristics of He-Ar Penning gases in insulating tubes were analyzed qualitatively.The relation between the effective length of an antenna column filled with He-Ar Penning gases and the applied radio frequency (RF) power was investigated both theoretically and experimentally.The distribution of the plasma density along the antenna column in different conditions was studied.The receiving characteristics of local frequency modulated (FM) electromagnetic waves by the plasma antenna filled with He-Ar Penning gases were compared with those by an aluminum antenna with the same dimensions.Results show that it is feasible to take plasma antennas filled with He-Ar Penning gases as receiving antennas.     

Progress of Ambipolar Mirror Trap

Essential experimental results at ambipolar (tandem) mirror traps are briefly reviewed. Progress on longitudinal plasma confinement by ambipolar barriers (plugs) and on suppression of transverse anomalous plasma losses in a solenoid are noted. Experimental exploration of MHD-stabilization of high pressure plasma ( 1) by vacuum chamber walls and of ion pumping from stationary thermal barriers is emphasized. Geometry of an axisymmetric trap, in which self-sustaining D-T reaction is possible, is briefly described.     

基于LabVIEW的多路湿度控制系统

利用北京谱仪Ⅲ上的干燥系统提供的干空气,整合小型温湿度一体探头、智能采集模块、开关量控制模块和普通气体电磁阀,基于LabVIEW图形化编程环境开发了一套多路湿度控制系统.此系统可同时实现多个不同湿度小环境的实时监测和控制,并可以扩展到多路温湿度的混合控制,单路湿度可以控制在空气湿度以下直至相对湿度低于3%的任意值,湿度...     

核反应堆功率控制系统的数字化实现

功率控制系统是反应堆的一关键控制系统,系统复杂,可靠性要求高.以前的核电站功率控制系统通常采用模拟技术.数字化方案将更有优势,但有相当的难度和待解决的问题.本文介绍一座试验堆的全数字化功率控制系统的设计方案和设计思想,采用了商品级计算机硬件、冗余联锁的软件、严格的质保措施、最终的半实物仿真实验,论证了数字化是可行的、可信的、安全的、经济的.     

Breakdown Voltage Research of Penning Gas Mixture in Plasma Display Panel

Paschen law and equations, which ignore the influence of the Penning ionization on the electron ionization coefficient （α）, are always used as the approximation of the breakdown voltage criterion of the Penning gas mixture in current researches of discharge characteristics of the plasma display panel （PDP）. It is doubtful that whether their results match the facts. Based on the Townsend gas self-sustaining discharge condition and the chemical kinetics analysis of the Penning gas mixture discharging in PDP, the empirical equation to describe the breakdown of the Penning gas mixture is given. It is used to calculate the breakdown voltage curves of Ne-Xe/MgO and Ne-Ar/MgO in a testing macroscopic discharge cell of AC-PDP. The effective secondary electron emission coefficients （γeff） of the MgO protective layers are derived by comparing the breakdown voltage curves obtained from the empirical equation with the experimental data of breakdown voltages. In comparison with the results calculated by the Paschen law and the equation which ignore the influence of the Penning ionization on α , the results calculated by the empirical equation have better conformity with experimental data. The empirical equation characterizes the breakdown of the Penning gas mixture in PDP effectively, and gives a convenient way to study its breakdown characteristics and the secondary electron emission behaviors.     

宁德核电站控制区智能配发系统

传统出入核电站控制区是采用“用证件换钥匙取剂量计”的人工流程,该流程需要人工24小时进行配发,工作量大、效率低。为了优化进出控制区流程,提高效率,实现无人化管理,宁德核电于2018年上线控制区智能配发系统。本文介绍该系统的组成及功能,结合现场调试经验,提出了系统存在的问题,并对后续改进工作提出了建议。     

一种新型多功能数据采集控制系统

本文介绍了一种新型多功能数据采集控制系统，它是采用单片微机的采集控制系统。实现了多数据的自动采集与控制及多功能。文中介绍了它的组成、功能、总体考虑、软硬件设计，实验结果及结论等。     

兰州重离子加速器冷却储存环磁场测量系统

文章涉及兰州重离子加速器冷却储存环(HIRFL CSR)的磁场测量系统。对霍尔片点测量系统、积分长线圈测量系统和谐波线圈测量系统的构成、控制与获取系统,以及新建成设备和探头的结构特点、参数作了详细描述。本测磁系统的精度和重复性完全满足CSR大型高精度磁铁测量的需要,已经完成了对CSRm注入线所有二极磁铁和四极磁铁的测量,正在进行其它各类磁铁的测量。