Circa AD 626 volcanic eruption；climatic cooling；and the collapse of the Eastern Turkic Empire

IEECAS SKLLQG

The influence and chronological uncertainties of the 8.2 ka cooling event on continental climate records in China

IEECAS SKLLQG

Primary design of stochastic cooling in CSRm

Based on several facts of CSRrn, such as the layout of the ring, the lattice parameters, exiting Schottky noise diagnosis equipment and fund, the primary stochastic cooling design of CSRm has been carried out. The optimum cooling time and the optimum cooling bandwidth axe obtained through simulation using the cooling function. The results indicate that the stochastic cooling is quite a powerful cooling method for CSRm. The comparison of the cooling effects of stochastic cooling and electron cooling in CSR are also presented. We can conclude that the combination of the two cooling methods on CSRrn will improve the beam cooling rate and quality beam greatly.

COD by magnetic field in electron-cooling section and correction at CSR

Application of electron-cooling upgrades the quality of ion beams in the storage rings and brings new problems. The transverse magnetic field distorts the ion orbit while guiding the intense electron beam. The closed-orbit distortion should be and can be localized and controlled well inside the ring acceptance. This paper deals with the field in the e-cool section and concomitant COD of ion orbit and shows the correction scheme.

兰州重离子加速器冷却储存环主环二极铁电源设计；Design of main ring dipole power supply for Heavy Ion Research Facility in Lanzhou-Cooling Storage Ring

主环二极铁电源是兰州重离子加速器冷却储存环(HIRFL-CSR)工程的关键设备和指标要求最高的一台电源,采用了独特的拓扑和控制策略。为满足峰值功率3.15MW(3kA,1.45kV)的输出能力和快脉冲要求,采用了晶闸管整流并联脉宽调制补偿单元的主电路拓扑结构和特殊的控制方式,这套综合方案确保电源满足了全部技术指标。本文介绍了该拓扑结构的原理和优势,讨论了为满足±2×10-4的跟踪误差的要求而采用的控制拓扑和双基准给定的原理,并简介了调试过程和近年来的运行和改进情况。

基于P2P技术的CSRe冷却装置控制系统设计；Design of Control System for CSRe Cooling Equipment Based on P2P Technology

HIRFL-CSR工程对CSRe冷却装置电子冷却部分的控制系统在实时性和可靠性方面提出了非常高的要求。电子冷却工作环境复杂,各种干扰难以预测。从电子冷却的控制系统改进出发,以实现电子冷却的自动调束为目标,以高端FPGA和ARM嵌入式系统为基础,采用P2P通讯技术和神经元网络算法来实现对电子冷却的自动控制。该控制系统对电子冷却控制的完善提供了先进的硬件平台和软件实现方案。

HIRFL—CSR循环冷却水温度远程测量系统设计；A Design of Remote Temperature-measuring System for HIFRL-CSR Recyclable Cooling Water System

介绍了一种基于一线总线数字温度传感器的HIFRL-CSR循环冷却水温度远程测量系统,阐述了以DT400模块为核心的温度测量的硬件模块和软件设计。该系统具有测温精度高、易扩展性、低成本、低功耗、可靠性高、抗干扰能力强等特点,根据不同需要可应用于多种温度测量系统中。

CSR外靶实验终端中CsI(Tl)晶体的测试；Test of CsI(Tl) Crystal at External Target Experimental Terminal of Cooling Storage Ring

为测量重离子加速器冷却储存环(HIRFL-CSR)的外靶实验终端上不同能量的γ射线,一种用于探测γ射线的高能量分辨的探测装置正在中国科学院近代物理研究所建设,该探测器由中国科学院近代物理研究所自行生长的铊激活的碘化铯CsI(Tl)晶体组成。与日本Hamamatsu公司生产的S8664-1010型雪崩光二极管(APD)耦合,测试其光输出的非均匀性和能量分辨,从测试结果给出了所需CsI(Tl)晶体合格的标准。目前已完成该γ探测球计划的六分之一,所提供的晶体合格率达94%以上。

Commissioning of electron cooling in CSRe

The 400 MeV/u C-12(6+) ion beam was successfully cooled by the intensive electron beam near 1 A in CSRe. The momentum cooling time was estimated near 15 s. The cooling force was measured in the cases of different electron beam profiles, and the different angles between the ion beam and electron beam. The lifetime of the ion beam in CSRe was over 80 h. The dispersion in the cooling section was confirmed as positive close to zero. The beam sizes before cooling and after cooling were measured by the moving screen. The beam diameter after cooling was about 1 mm. The bunch length was measured with the help of the signals from the beam position monitor. The diffusion was studied in the absence of the electron beam.

电容式束流位置探测器在HIRFL-CSR电子冷却实验中的应用

高效率的电子冷却过程，要求电子束与离子束相互平行，要求电子束与离子束同轴。为了同时测量电子束与离子束的相对位置和夹角，考虑了容式、感式、条带型束流位置探针特点以及电子冷却段实际情况，在HIRFL-CSR电子冷却装置上建立了以容性圆筒形极板为感应电极、NI公司PXI-5105高精度数字化仪为数据采集设备、PET公司P/N AM-4A-000110-11030N型宽带放大器为信号处理电路的束流位置测量系统。通过测量束流通过探针时在极板上产生的脉冲信号，对其进行傅立叶变换得到频谱信号，分析四个不同电极上的频谱信号强度获取束流的位置信息。同时，为了调整电子束与离子束的相对位置和夹角，建立了一套以ADLINK公司的PCI-9113和PCI-6216数据卡为主，针对电子冷却装置中各螺线管电源、静电偏转板电源、校正线圈电源的控制系统，完成了校正线圈、静电偏转板以及螺线管对电子束位置的偏移、扫描，实现了电子束的位置、角度调整。 通过使用位置测量系统、电子束位置调整系统获得了校正线圈、螺线管、静电偏转板对电子束的位置偏移能力以及电子束的流强、电流密度分布、径向尺寸、绝热展开因子对束流位置的影响。在冷却累积过程中进行了改变电子束与离子束相对位置、夹角的实验，观察到了冷却力和离子束流强随相对位置、夹角的变化趋势，进而优化相对位置和夹角，实现高冷却效率。 根据实验数据分析了位置测量系统的系统误差来源和精度，提出了今后提高束流位置测量系统、调整系统稳定性、精确性而需要进行的工作；在此基础上使用测量系统、调整系统进行了电子束、离子束相对位置和角度对冷却效果的影响等电子冷却相关实验工作

Capacitive detection of glucose using molecularly imprinted polymers

A novel glucose biosensor based on capacitive detection has been developed using molecularly imprinted polymers. The sensitive layer was prepared by electropolymerization of o-phenylenediamine on a gold electrode in the presence of the template (glucose). Cyclic voltammetry and capacitive measurements monitored the process of electropolymerization. Surface uncovered areas were plugged with 1-dodecanethiol to make the layer dense, and the insulating properties of the layer were studied in the presence of redox couples. The template molecules and the nonbound thiol were removed from the modified electrode surface by washing with distilled water. A capacitance decrease could be obtained after injection of glucose. The electrode constructed similarly but with ascorbic acid or fructose only showed a small response compared with glucose. The stability and reproducibility of the biosensor were also investigated. (C) 2001 Elsevier Science B.V. All rights reserved.