The Shanghai Advanced Proton Therapy facility employs third-integer slow extraction. In order to achieve accurate treatment, high-quality spill is needed. Therefore,parameters that may affect slow extraction should be...The Shanghai Advanced Proton Therapy facility employs third-integer slow extraction. In order to achieve accurate treatment, high-quality spill is needed. Therefore,parameters that may affect slow extraction should be investigated by simulation. A computer model of the synchrotron operation slow extraction was constructed with MATLAB~. By simulating the motion of the circulating protons, we could quantify the influence of machine and initial beam parameters on properties of the extracted beam, such as ripple, uniformity, stability, on-and off-time of the spill and spill width in the synchrotron.Suitable design parameters including the horizontal tunes,power supply ripple, longitudinal RF cavity voltage, RFKO and the chromaticities were determined.展开更多
针对超大规模模块化多电平换流器高压直流输电(modular multilevel converter based HVDC,MMC-HVDC)在诸如PSCAD/EMTDC、MATLAB等电磁暂态仿真环境中仿真速度极慢问题,基于节点电压分析法,提出超大规模MMC电磁暂态仿真提速模型。所提出...针对超大规模模块化多电平换流器高压直流输电(modular multilevel converter based HVDC,MMC-HVDC)在诸如PSCAD/EMTDC、MATLAB等电磁暂态仿真环境中仿真速度极慢问题,基于节点电压分析法,提出超大规模MMC电磁暂态仿真提速模型。所提出模型本质为将MMC在计算过程中的超大规模矩阵分解为相应数目的小矩阵,在与原有矩阵同解以保证仿真精度的前提下,仿真速度显著提升。所提出的模型具有极强的通用性,且可以进行开关器件级别的故障研究。在PSCAD/EMTDC中搭建的不同电平数MMC验证了提速模型的仿真精度及提速效果。展开更多
基金supported by the Youth Innovation Promotion Association of Chinese Academy of Sciences(No.20150210)
文摘The Shanghai Advanced Proton Therapy facility employs third-integer slow extraction. In order to achieve accurate treatment, high-quality spill is needed. Therefore,parameters that may affect slow extraction should be investigated by simulation. A computer model of the synchrotron operation slow extraction was constructed with MATLAB~. By simulating the motion of the circulating protons, we could quantify the influence of machine and initial beam parameters on properties of the extracted beam, such as ripple, uniformity, stability, on-and off-time of the spill and spill width in the synchrotron.Suitable design parameters including the horizontal tunes,power supply ripple, longitudinal RF cavity voltage, RFKO and the chromaticities were determined.
文摘针对超大规模模块化多电平换流器高压直流输电(modular multilevel converter based HVDC,MMC-HVDC)在诸如PSCAD/EMTDC、MATLAB等电磁暂态仿真环境中仿真速度极慢问题,基于节点电压分析法,提出超大规模MMC电磁暂态仿真提速模型。所提出模型本质为将MMC在计算过程中的超大规模矩阵分解为相应数目的小矩阵,在与原有矩阵同解以保证仿真精度的前提下,仿真速度显著提升。所提出的模型具有极强的通用性,且可以进行开关器件级别的故障研究。在PSCAD/EMTDC中搭建的不同电平数MMC验证了提速模型的仿真精度及提速效果。
