给出快响应束流损失监控(Fast Beam Lost Monitor,FBLM)系统的液体闪烁体探测器初样的研制。在高频四极加速器(Radio Frequency Quadrupole,RFQ)实验装置上的测试表明,液闪探测器能给出宽度为500μs束流宏脉冲结构,能逐个显示出宏脉冲内...给出快响应束流损失监控(Fast Beam Lost Monitor,FBLM)系统的液体闪烁体探测器初样的研制。在高频四极加速器(Radio Frequency Quadrupole,RFQ)实验装置上的测试表明,液闪探测器能给出宽度为500μs束流宏脉冲结构,能逐个显示出宏脉冲内490 ns的束流切束脉冲。液闪输出信号脉冲较490 ns束流切束脉冲延迟约70 ns。液闪型FBLM输出的信号幅度大于塑闪型。液闪探测器初样的成功研制,为其性能进一步改进提高,打下了良好的基础。展开更多
With the purpose of on-line structural health monitoring,a transducer network was embedded into compos- ite structure to minimize the influence of surroundings.The intrinsic dispersion characteristic of Lamb wave make...With the purpose of on-line structural health monitoring,a transducer network was embedded into compos- ite structure to minimize the influence of surroundings.The intrinsic dispersion characteristic of Lamb wave makes the wavelet transform an effective signal processing method for guided waves.To get high precision in feature extrac- tion,an information entropy-based optimal mother wavelet selection approach was proposed,which was used to choose the most appropriate basis function for particular Lamb wave analysis.By using the embedded sensor network and extracting time-of-flight,delamination in the composite laminate was identified and located.The results demon- strate the effectiveness of the proposed methods.展开更多
加速器驱动次临界系统C-ADS注入器Ⅱ采用强流超导质子直线加速器,设计流强达到10 m A。强流质子束产生的束流损失有可能损伤超导腔,需要专用的束流损失监测系统进行监测,束流损失探测器(BLM)需要在高能量沉积导致超导腔失超之前提供警...加速器驱动次临界系统C-ADS注入器Ⅱ采用强流超导质子直线加速器,设计流强达到10 m A。强流质子束产生的束流损失有可能损伤超导腔,需要专用的束流损失监测系统进行监测,束流损失探测器(BLM)需要在高能量沉积导致超导腔失超之前提供警报。通过MCNPX模拟计算10 Me V质子在半波谐振腔(HWR)不同位置损失产生的辐射场,比较选取超导腔管道进出口处4个位置为推荐束损探测器放置的位置,结合HWR腔结构和束损探测器选择的影响因素,计算了次级辐射在金刚石探测器中的能量沉积以及1°～5°不同质子入射角度对探测的影响。结果表明,根据不同位置处探测器的能量沉积关系可以推断出束损点;不同入射角度不会影响生成粒子的能量分布,只轻微影响生成粒子的数目。展开更多
文摘给出快响应束流损失监控(Fast Beam Lost Monitor,FBLM)系统的液体闪烁体探测器初样的研制。在高频四极加速器(Radio Frequency Quadrupole,RFQ)实验装置上的测试表明,液闪探测器能给出宽度为500μs束流宏脉冲结构,能逐个显示出宏脉冲内490 ns的束流切束脉冲。液闪输出信号脉冲较490 ns束流切束脉冲延迟约70 ns。液闪型FBLM输出的信号幅度大于塑闪型。液闪探测器初样的成功研制,为其性能进一步改进提高,打下了良好的基础。
基金Supported by Natural Science Foundation of China(NSFC No.10702041)NSFC Joint Research Fund for Overseas Chinese Young Scholars(10528206)+1 种基金Key International S&T Cooperation Project of China Ministry of Science and Technnlogy(2005DFA00110)Australian Research Council(Discovery Project).
文摘With the purpose of on-line structural health monitoring,a transducer network was embedded into compos- ite structure to minimize the influence of surroundings.The intrinsic dispersion characteristic of Lamb wave makes the wavelet transform an effective signal processing method for guided waves.To get high precision in feature extrac- tion,an information entropy-based optimal mother wavelet selection approach was proposed,which was used to choose the most appropriate basis function for particular Lamb wave analysis.By using the embedded sensor network and extracting time-of-flight,delamination in the composite laminate was identified and located.The results demon- strate the effectiveness of the proposed methods.
文摘加速器驱动次临界系统C-ADS注入器Ⅱ采用强流超导质子直线加速器,设计流强达到10 m A。强流质子束产生的束流损失有可能损伤超导腔,需要专用的束流损失监测系统进行监测,束流损失探测器(BLM)需要在高能量沉积导致超导腔失超之前提供警报。通过MCNPX模拟计算10 Me V质子在半波谐振腔(HWR)不同位置损失产生的辐射场,比较选取超导腔管道进出口处4个位置为推荐束损探测器放置的位置,结合HWR腔结构和束损探测器选择的影响因素,计算了次级辐射在金刚石探测器中的能量沉积以及1°～5°不同质子入射角度对探测的影响。结果表明,根据不同位置处探测器的能量沉积关系可以推断出束损点;不同入射角度不会影响生成粒子的能量分布,只轻微影响生成粒子的数目。
