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首页> 外文会议>IEEE International Conference on Plasma Science >Study on the After Cavity Interaction in a 140 Ghz Gyrotron Using 3D CFDTD PIC Simulations
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Study on the After Cavity Interaction in a 140 Ghz Gyrotron Using 3D CFDTD PIC Simulations

机译：使用3D CFDTD PIC仿真研究140 Ghz回旋管中的后腔相互作用

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A computational study on after cavity interaction (ACI) in a 140 GHz gryotron for fusion research has been performed using a 3-D conformal finite-difference time-domain (CFDTD) particle-in-cell (PIC) method. The ACI, i.e., beam wave interaction in the non-linear uptaper after the cavity has attracted a lot of attention and been widely investigated in recent years. In a dynamic ACI, a TE mode is excited by the electron beam at the same frequency as in the cavity, and the same mode is also interacting with the spent electron beam at a different frequency in the non-linear uptaper after the cavity while in a static ACI, a mode interacts with the beam both at the cavity and at the uptaper, but at the same frequency. A previous study on the dynamic ACI on a 140 GHz gyrotron has concluded that more advanced numerical simulations such as particle-in-cell (PIC) modeling should be employed to study or confirm the dynamic ACI in addition to using trajectory codes. In this work, we use a 3-D full wave time domain simulation based on the CFDTD PIC method to include the rippled-wall launcher of the quasi-optical output coupler into the simulations which breaks the axial symmetry of the original model employing a symmetric one. A preliminary simulation result has confirmed the dynamic ACI effect in this 140 GHz gyrotron in good agreement with the former study. A realistic launcher will be included in the model for studying the dynamic ACI and compared with the homogenous one.
机译：已经使用3-D共形有限差分时域（CFDTD）单元内粒子（PIC）方法对140 GHz磁加速器中的腔后相互作用（ACI）进行了计算研究，以进行融合研究。 ACI，即腔后的非线性向上光束中的束波相互作用已经引起了广泛的关注，并且近年来进行了广泛的研究。在动态ACI中，TE模式由电子束以与腔中相同的频率激发，并且在腔中之后的非线性小孔中，相同模式还与废电子束以不同的频率相互作用。如果是静态ACI，则模式会在腔体和上三角片处以相同的频率与光束相互作用。先前关于140 GHz回旋管上动态ACI的研究得出的结论是，除了使用轨迹代码之外，还应采用更高级的数值模拟（例如，单元中粒子（PIC）建模）来研究或确认动态ACI。在这项工作中，我们使用基于CFDTD PIC方法的3-D全波时域仿真，将准光输出耦合器的波纹壁发射器包含在仿真中，这打破了采用对称方法的原始模型的轴向对称性一。初步的模拟结果证实了该140 GHz回旋管中的动态ACI效应与先前的研究很好地吻合。该模型中将包括一个现实的发射器，用于研究动态ACI，并与同类发射器进行比较。

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