A Brief Presentation of Lanzhou Penning Trap Control System

LPT (Lanzhou Penning Trap) is an ion-trap facility in Lanzhou, China. As ions can be cooled to an extremely small phase space and can be stored for a very long time, ion traps are a perfect instrument for high precision mass measurements. A system with specialized electronics for LPT is under construction now. This system could be used for voltage and timing control to make ions moving in a special mode, and the data acquisition and analysis online/offline could be achieved in the mean time. The requirements of control system, the distribution of hardware, the overview of software, and the latest progress of LPTCtrlSys (Lanzhou Penning Trap Control System) are presented.     

教师资格证面试界面的制作

本文使用flash软件制作出一款用于电脑上操作的教师资格证面试界面,具有随机抽题、倒计时、算分等功能。该界面可用于考生进行考前规范的模拟练习,帮助其还原真正考试时的流程,也可用于学校每年的师范生技能训练考核考试。     

RFQ1L宽带射频功率信号源的研制及调试

介绍了重原子和核结构研究谱仪SHANS中RFQ冷却聚束器RFQ1L上宽带射频功率信号源的研制过程和调试情况。实验结果表明：该功率信号源达到设计要求,频率在40～1000kHz内连续可调,两路输出反相达到要求,电压幅度在RFQ1L现有工作频率下,满足设备的调试要求。     

RFQ冷却聚束器束流冷却后的性质模拟

介绍了RFQ冷却聚束器的基本工作原理和束流在其中被约束和冷却的过程。采用真实相互作用势（RIP）模型进行蒙特卡罗模拟,得出束流在RFQ冷却聚束器中完全冷却后的性质。结果表明：束流冷却后的束斑和能量分散随时间一直保持平衡;束流冷却后束斑和能量分散不随缓冲气体气压、入射离子能量的变化而变化;冷却后束斑半径与射频（RF）四极电场频率呈反比,而冷却后束流的能量分散仅与温度有关。     

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.