针对应用于硼中子俘获治疗的加速器中子源的束流偏转问题,为其低能束流传输线部分设计了一套斩束器,通过理论计算与软件模拟,验证方案的可行性。为了解决斩波器电场强度不均匀问题,引入圆弧电极设计结构,微波工作室(CST Studio Suite)...针对应用于硼中子俘获治疗的加速器中子源的束流偏转问题,为其低能束流传输线部分设计了一套斩束器,通过理论计算与软件模拟,验证方案的可行性。为了解决斩波器电场强度不均匀问题,引入圆弧电极设计结构,微波工作室(CST Studio Suite)模拟仿真表明其具有更好的电场分布均匀性。发展了基于Python程序的CST与TraceWin联合束流动力学模拟,结果表明设计的斩波器能够高效率地实现束流偏转功能,设计方案具有良好的实际应用价值和意义。展开更多
Electron beam injectors are pivotal components of large-scale scientific instruments,such as synchrotron radiation sources,free-electron lasers,and electron-positron colliders.The quality of the electron beam produced...Electron beam injectors are pivotal components of large-scale scientific instruments,such as synchrotron radiation sources,free-electron lasers,and electron-positron colliders.The quality of the electron beam produced by the injector critically influences the performance of the entire accelerator-based scientific research apparatus.The injectors of such facilities usually use photocathode and thermionic-cathode electron guns.Although the photocathode injector can produce electron beams of excellent quality,its associated laser system is massive and intricate.The thermionic-cathode electron gun,especially the gridded electron gun injector,has a simple structure capable of generating numerous electron beams.However,its emittance is typically high.In this study,methods to reduce beam emittance are explored through a comprehensive analysis of various grid structures and preliminary design results,examining the evolution of beam phase space at different grid positions.An optimization method for reducing the emittance of a gridded thermionic-cathode electron gun is proposed through theoretical derivation,electromagnetic-field simulation,and beam-dynamics simulation.A 50%reduction in emittance was achieved for a 50 keV,1.7 A electron gun,laying the foundation for the subsequent design of a high-current,low-emittance injector.展开更多
文摘针对应用于硼中子俘获治疗的加速器中子源的束流偏转问题,为其低能束流传输线部分设计了一套斩束器,通过理论计算与软件模拟,验证方案的可行性。为了解决斩波器电场强度不均匀问题,引入圆弧电极设计结构,微波工作室(CST Studio Suite)模拟仿真表明其具有更好的电场分布均匀性。发展了基于Python程序的CST与TraceWin联合束流动力学模拟,结果表明设计的斩波器能够高效率地实现束流偏转功能,设计方案具有良好的实际应用价值和意义。
基金supported by the Hundred-person Program of Chinese Academy of Sciences and the National Natural Science Foundation of China(No.11905074).
文摘Electron beam injectors are pivotal components of large-scale scientific instruments,such as synchrotron radiation sources,free-electron lasers,and electron-positron colliders.The quality of the electron beam produced by the injector critically influences the performance of the entire accelerator-based scientific research apparatus.The injectors of such facilities usually use photocathode and thermionic-cathode electron guns.Although the photocathode injector can produce electron beams of excellent quality,its associated laser system is massive and intricate.The thermionic-cathode electron gun,especially the gridded electron gun injector,has a simple structure capable of generating numerous electron beams.However,its emittance is typically high.In this study,methods to reduce beam emittance are explored through a comprehensive analysis of various grid structures and preliminary design results,examining the evolution of beam phase space at different grid positions.An optimization method for reducing the emittance of a gridded thermionic-cathode electron gun is proposed through theoretical derivation,electromagnetic-field simulation,and beam-dynamics simulation.A 50%reduction in emittance was achieved for a 50 keV,1.7 A electron gun,laying the foundation for the subsequent design of a high-current,low-emittance injector.
