Nonlinear Dynamics of Multipactor in Multicarrier Systems

多载波系统中多处理器的非线性动力学

• 批准号: 1535519
• 负责人: Rami Kishek
• 金额: $ 36万
• 依托单位: University of Maryland, College Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-09-01 至 2020-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1535519&HistoricalAwards=false
• 关键词: Nonlinear; Dynamics; Multipactor; Multicarrier; Systems

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.

该基金支持一种称为多因子的放电现象的理论研究，这种现象发生在广泛的微波器件中。多因素是一种有害的放电，可以损坏或破坏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。尽管进行了几十年的研究，特别是与粒子加速器的射频系统有关的研究，但它仍然是一个问题，而且没有找到一致的方法来消除它。从这项工作中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嬗变。空间和卫星通信将进一步受益于这项研究。该基金将资助一名研究生，并将用于文献、课程材料和进一步的教育推广。目的是利用基于非线性动力学和混沌技术的新型多因子理论来分析多载波系统中的多因子。多载波射频信号（即多个射频频率）存在下的多因子是一个特别具有挑战性的问题，几乎没有理论研究。该方法旨在通过对动态空间结构的全局分析来识别多碰撞区域的边界和稳定性。理论结果将通过使用细胞内粒子代码的计算机模拟以及我们在西班牙瓦伦西亚ValSpace Consortium的合作者进行的实验进行测试。