Nonlinear Dynamics of Multipactor in Multicarrier Systems

这笔赠款支持对一种被称为微放电现象的理论研究，这种现象发生在广泛的微波设备中。微电容器是一种有害的放电，可以损坏或摧毁加速器结构和微波组件以及相关电子设备，如天线、卫星有效载荷或雷达系统。尽管经过了几十年的研究，特别是在粒子加速器的射频系统方面，它仍然是一个问题，还没有找到一致的方法来消除它。通过这项工作预期的更好的理解将使更紧凑和更高梯度的粒子加速器成为可能。许多加速器应用将从中受益，例如紧凑型医疗加速器、用于基础研究的基于加速器的中子和光源，以及基于加速器的核能产生和核废料的转化。空间和卫星通信将进一步受益于这项研究。这笔助学金将资助一名研究生，并将对文献、课程材料和进一步的教育外展做出贡献。目标是使用基于非线性动力学和混沌技术的新的微电抗器理论来分析多载波系统中的微电抗器。多载波射频信号(即多个射频频率)下的微电容器是一个特别具有挑战性的问题，几乎没有理论研究。新方法旨在通过全局分析动态空间结构来识别多搏动区域边界和稳定性。理论结果将与使用细胞内粒子代码的计算机模拟以及我们在西班牙巴伦西亚的ValSpace Consortium的合作者进行的实验进行验证。

This grant supports the theoretical study of an electrical discharge phenomenon, called multipactor, that occurs in a broad range of microwave devices. Multipactor is a pernicious electrical discharge that can damage or destroy accelerator structures and microwave components and related electronics, such as antennas, satellite payloads, or radar systems. Despite decades of study, especially in connection with rf systems for particle accelerators, it remains a problem, and no consistent way has been found to eliminate it. The improved understanding anticipated from this work will enable more compact and higher-gradient particle accelerators. Many accelerator applications stand to benefit from this, such as compact medical accelerators, accelerator-based neutron and light sources used for basic research, and accelerator-based nuclear energy generation and transmutation of nuclear waste. Space and satellite communications will further benefit from this study. The grant will support one graduate student, and will contribute to the literature, course material, and further educational outreach.The objective is to analyze multipactor in multicarrier systems using a novel multipactor theory based on techniques from nonlinear dynamics and chaos. Multipactor in the presence of multiple carrier rf signals (i.e. multiple rf frequencies) is an especially challenging problem that has almost no theoretical studies. The new approach aims to identify multipacting region boundaries and stability by globally analyzing the structure of dynamical space. The theoretical results will be tested against computer simulations using a particle-in-cell code, and against experiments conducted by our collaborators at ValSpace Consortium in Valencia, Spain.