电源系统是兰州重离子加速器(Heavy Ion Research Facility in Lanzhou,HIRFL)装置中的重要系统组成之一,成千上百台电源输出电流的稳定性与精确性直接影响束流的品质。为了保证HIRFL束流的准确性和一致性,需要对分布在主环、实验环上10...电源系统是兰州重离子加速器(Heavy Ion Research Facility in Lanzhou,HIRFL)装置中的重要系统组成之一,成千上百台电源输出电流的稳定性与精确性直接影响束流的品质。为了保证HIRFL束流的准确性和一致性,需要对分布在主环、实验环上100余台高精度数字化脉冲电源进行标定校准。本文主要介绍了一种高精度数字化电源脉冲标定系统的硬件组成、软件架构、标定算法以及数据处理方法,给出了标定结果。实际标定结果显示,标定之后的标准输出电流值精度提高了一个数量级,回读值精度提高了两个数量级以上,表明该方法能够有效地提高HIRFL高精度数字化脉冲电源的输出电流精度和回读精度。展开更多
Morphological changes with decreasing relative humidity(RH) of supersaturated sea-salt aerosol droplets on a quartz substrate were observed using a high-speed video-camera.Stable gypsum(CaSO4·2H2O) or the metasta...Morphological changes with decreasing relative humidity(RH) of supersaturated sea-salt aerosol droplets on a quartz substrate were observed using a high-speed video-camera.Stable gypsum(CaSO4·2H2O) or the metastable hemihydrate(CaSO4·0.5H2O) were precipitated as the RH decreased.The dynamic process of crystal growth under steady-state humidity was studied by controlling the RH;the metastable hemihydrate was precipitated at 70.5%-77.1% RH,and the apparent crystal growth rate was between 1.42 and 2.33 μm3/s.Stable gypsum was formed at 80.7%-82.2% RH,and the apparent crystal growth rate was between 0.70 and 0.81 μm3/s.展开更多
文摘电源系统是兰州重离子加速器(Heavy Ion Research Facility in Lanzhou,HIRFL)装置中的重要系统组成之一,成千上百台电源输出电流的稳定性与精确性直接影响束流的品质。为了保证HIRFL束流的准确性和一致性,需要对分布在主环、实验环上100余台高精度数字化脉冲电源进行标定校准。本文主要介绍了一种高精度数字化电源脉冲标定系统的硬件组成、软件架构、标定算法以及数据处理方法,给出了标定结果。实际标定结果显示,标定之后的标准输出电流值精度提高了一个数量级,回读值精度提高了两个数量级以上,表明该方法能够有效地提高HIRFL高精度数字化脉冲电源的输出电流精度和回读精度。
基金supported by the National Natural Science Foundation of China (20933001,41175119 and 20873006)the National Basic Research Program of China (2009CB220100)the Trans-Century Training Program Foundation for the Talents
文摘Morphological changes with decreasing relative humidity(RH) of supersaturated sea-salt aerosol droplets on a quartz substrate were observed using a high-speed video-camera.Stable gypsum(CaSO4·2H2O) or the metastable hemihydrate(CaSO4·0.5H2O) were precipitated as the RH decreased.The dynamic process of crystal growth under steady-state humidity was studied by controlling the RH;the metastable hemihydrate was precipitated at 70.5%-77.1% RH,and the apparent crystal growth rate was between 1.42 and 2.33 μm3/s.Stable gypsum was formed at 80.7%-82.2% RH,and the apparent crystal growth rate was between 0.70 and 0.81 μm3/s.