On the basis of general description of AMS, the advantage and development of tandem accelerator based AMS are discussed. The AMS facility at Peking University and its preliminary applications are described.
Based on the generalized truncated second-order moments,an approximate analytical formula of the beam propagation factor M^2 of high-power laser beams passing through the optical system with multiple hard-edged apertu...Based on the generalized truncated second-order moments,an approximate analytical formula of the beam propagation factor M^2 of high-power laser beams passing through the optical system with multiple hard-edged apertures is deduced.Numerical examples of the beams passing through an aperture-spatial filter are enclosed,and the influences of amplitude modulations(AMs)and phase fluctuations(PFs)on the beam propagation quality of high-power laser beams passing through the multi-apertured ABCD optical system are considered and discussed.It is shown that PFs are able to degrade the beam propagation quality of laser beams more than AMs when the high-power laser beams passing through the aperture-spatial filter,furthermore,one or two aperture-lens optical systems configured appropriate aperture parameters are both able to upgrade the beam propagation quality of high-power laser beams.The M2 factor of Gaussian beam passing through the multi-aperture optical system is a special case in this paper.展开更多
文摘On the basis of general description of AMS, the advantage and development of tandem accelerator based AMS are discussed. The AMS facility at Peking University and its preliminary applications are described.
基金Science Fund from the Shaanxi Provincial Education Department,China(Grant No.18JK0723).
文摘Based on the generalized truncated second-order moments,an approximate analytical formula of the beam propagation factor M^2 of high-power laser beams passing through the optical system with multiple hard-edged apertures is deduced.Numerical examples of the beams passing through an aperture-spatial filter are enclosed,and the influences of amplitude modulations(AMs)and phase fluctuations(PFs)on the beam propagation quality of high-power laser beams passing through the multi-apertured ABCD optical system are considered and discussed.It is shown that PFs are able to degrade the beam propagation quality of laser beams more than AMs when the high-power laser beams passing through the aperture-spatial filter,furthermore,one or two aperture-lens optical systems configured appropriate aperture parameters are both able to upgrade the beam propagation quality of high-power laser beams.The M2 factor of Gaussian beam passing through the multi-aperture optical system is a special case in this paper.
文摘由于地铁受电弓—接触线系统受电力列车运行速度限制,采用高空刚性架设接触供电方式.接触网实时参数测量和整定过程中,主要取决精密仪器结构状态与测量参数误差校正.传统的测量仪器采用激光相机与传感器组合方式,其数据传输整定慢、计算复杂融合难度大、受地铁隧道环境影响模型辨识度低等缺点.文中提出一种基于模糊理论的MPC(Model Prediction Control,模型预测控制)算法,在实时测量目标点定位和数据优化精度方面,与PID控制策略比较.AME/simulink试验仿真表明,基于模糊理论的MPC预测算法能提高测量仪器定位点位置预测校正,测量点轨迹协同精度提高15%,减少软件计算数据的作业量20%,提高数据处理精准度±10 mm.
