论文标题
将粒子跟踪与电磁辐射淋浴相结合：将GPT和GEANT4与可视化合并
Combining Particle Tracking with Electromagnetic Radiation Showers: Merging GPT and Geant4 with Visualization
论文作者
论文摘要
场发射的电子会严重影响高场，高代因子电子加速器的运行。加速的场发射会导致高平均功率梁，从而可以辐射损伤光束线成分。此外，局部损失会产生热点热点，其量大的热点会降低光注射器和冷冻模块中所需的超高真空。然而，尽管它们的重要性，但电场发射的影响很少包括在电子喷射器的设计和工程中。这项工作试图通过结合两个著名且有据可查的程序GPT和GEANT4来纠正这种情况，以在喷油器束线中跟踪电子及其损失。本文描述了一个程序系统，该程序模拟了沿光束线的电子路径和损耗。此外，可以使用开源3D CAD程序将跟踪结果沿横梁置构层缩小和铺设。联合程序GPT-GEANT4的散射反照率计算与文献反照率很吻合。该论文以LCLS-II注射器的暗电流模拟从阴极到直流电仪的深色电流模拟。
Field emitted electrons can seriously affect the operation of high-field, high-duty factor electron accelerators. Accelerated field emission can result in high average power beams which can radiation damage beamline components. In addition, localized losses generate thermal hot spots whose outgassing degrades the ultra-high vacuum required in photoinjectors and cryomodules. However, despite their importance, the effects of field emission are rarely included in the design and engineering of electron injectors. This work attempts to remedy this situation by combining two well-known and well-documented programs, GPT and Geant4, to track electrons and their losses in an injector beamline. This paper describes a system of programs which simulates electron paths and losses along the beamline. In addition, the tracking results can be zoomed and panned along and about the beampipe envelope using an open-source 3D CAD program. The scattering albedo calculations of the combined program, GPT-Geant4, are shown to be in good agreement with the literature albedos. The paper concludes with a dark current simulation for the LCLS-II injector from the cathode to the collimator at 1.5 m from the cathode.
