BL14W1光束线XAFS实验站极低浓度数据采集系统

介绍上海光源BL14w1XAFS光束线实验站的极低浓度数据采集系统.该系统采用XFlash5040硅漂移固体探测器配合气体电离室、电流放大器及数据采集卡等仪器设备,以及用Labview软件编写的控制和采集程序.对Fe浓度为5.0μg/g的FeCl3水溶液样品和1 nm厚的Ni薄膜样品进行了XAFS谱的测量.测量结果表明...     

Comparative Study between Aerosol Resuspension Model in GASFLOW and RnR Model

Based on the design parameters and conditions of the aerosol resuspension test for the validation of the RnR model, an analysis model was built by using GASFLOW code for calculation and simulation, and the results were compared with the calculation results of RnR model and the test data. The study results show that GASFLOW can simulate aerosol resuspension well in the main stage of resuspension. Under the condition of lower air velocity, the analysis results of RnR model are closer to the test data. Under the condition of higher air velocity, the results of GASFLOW model are more conservative. In order to improve the accuracy of the calculation results, it is suggested to consider the probability distribution characteristics of adhesion, and carry out further study on the feasibility of developing RnR model in GASFLOW.     

高温无机闪烁晶体Ce:YAlO3的缺陷研究

采用同步辐射白光透射形貌术研究了提拉法生长的高温无机闪烁晶体Ce:YAlO3（简称Ce:YAP）中的缺陷。实验发现在Ce:YAP晶体中存在着生长条纹、包裹沉积物、核心、孪晶及位错簇等缺陷，同时对生长缺陷形成的原因进行了讨论。结果表明，离子掺杂浓度、原料的纯度以及生长工艺条件等是影响Ce:YAP晶体缺陷的主要原因。     

基于压电驱动的微振动主动减振控制系统研究

本文以压电陶瓷促动器构建并联六自由度减振平台,采用NI Compact-RIO实时控制系统和Fx-LMS自适应控制算法进行振动主动控制,对次级通道辨识方法和主动控制算法进行了模拟仿真,并搭建主动减振控制系统进行实验验证。仿真与实验结果表明,设计的主动减振控制系统对于7~50 Hz范围内的低频微振动有很好的控制效果。     

电荷耦合器件质子辐照效应研究

利用2×6 MV串列静电加速器提供的1~10 MeV质子,开展了线阵电荷耦合器件辐射损伤效应的模拟试验和测量,研制了加速器质子扩束扫描装置及电荷耦合器件辐射敏感参数测量系统,建立了电荷耦合器件质子辐射效应的模拟试验方法,分析了质子注量、质子能量、器件偏置等对器件电荷转移效率和暗电流的影响。模拟试验结果表明,电荷转移效率随辐照质子注量的增加而下降,暗电流随辐照质子注量的增加而增大,在1~10 MeV质子能量范围内,质子能量越低,电荷转移效率的降低与暗电流的增加越显著。     

Numerical study on the loss of fast ions produced by minority ion cyclotron resonance heating in EAST

The classical prompt loss of fast ions produced by minority ion cyclotron resonance heating(ICRH)is studied by a guiding center orbit following code in the Experimental Advanced Superconducting Tokamak(EAST).It is found that the loss of fast ions produced by ICRH mainly appears in both ends of the resonance layer,while the loss of fast ions in the middle resonance layer is very small.The dominant fast loss comes from trapped ions,rather than from passing ions.Controlling the location of resonance layer at the plasma core may be more beneficial to the EAST tokamak ICRH.In addition,the loss distribution of fast ions is studied.The results show that the fast ions are mainly lost near the midplane in the poloidal direction,but almost uniformly in the toroidal direction.Moreover,we investigate the dependence of fast ion loss on the ICRH power.The simulation results show that the loss fraction of fast ions in both ends of the resonance region increases with the ion cyclotron range of frequencies(ICRF)power,but barely affects the loss of fast ions in the middle region.     

低压高过冷度下自然循环流动不稳定性实验研究

对具有长直上升段的自然循环系统,开展了流动不稳定性实验研究。同时,详细分析了低压、高入口过冷度条件下典型的流动不稳定现象。实验表明：自然循环系统的结构、流体的热边界条件会影响自然循环的运行特性及流动不稳定性类型。较高入口过冷度下,高热流密度导致系统脱离稳态后,很难重新回到稳定的两相自然循环流动状态。随着热流密度的提高,系统会经历间歇沸腾、复合动态流动不稳定性等状态。依据实验结果得到了高入口过冷度下的不稳定性边界图。在两相振荡期间,自然循环驱动压头和回路阻力的主要影响因素集中在长直上升段和加热段。加热段出口积聚的大量气泡对上、下游流体的强烈挤压作用是流量大幅振荡及逆流的主要原因。     

基于高能X射线散射的高原子序数物质探测方法

针对核材料的探测问题,利用其高原子序数（Z）的特性,提出了基于散射能谱解析识别物质原子序数的方法。该方法通过对X射线与物质相互作用所产生的散射光子的测量和分析来进行物质识别,这些光子包括正电子湮没光子、轫致辐射光子和康普顿散射光子,携带了物质原子序数的信息。蒙特卡罗模拟计算结果表明,该方法能够分析核素的原子序数,尤其对核材料等高Z物质的分析更为有效。采用LaBr₃(Ce)探测器测量了基于7MeV电子直线加速器的多个样品的散射能谱,结果表明,该方法能有效区分高原子序数物质。     

组合离子束技术在硅基材料芯片中的应用

将组合技术和离子束技术结合起来,用于硅基发光材料的研究用组合离子束技术在硅基材料上制备了64个直径为2mm的单元--材料芯片,并对硅基材料芯片各单元进行了卢瑟辐背散射质子弹性散射和扫描阴极射线发光特性分析     

BES Ⅲ主漂移径迹重建软件MdcPatRec的设计与实现

介绍使用面向对象技术和C 语言开发的BESⅢ主漂移室径迹重建软件包MdcPatRec.它的主要任务是对主漂移室内带电径迹进行寻找,并精确地重建其动量和位置.本文将详细介绍重建软件包的设计和实现,并利用模拟数据给出重建软件的主要物理和系统性能.