太赫兹扩展互作用速调管非线性注-波互作用的机理研究

项目名称： 太赫兹扩展互作用速调管非线性注-波互作用的机理研究

项目编号： No.11305177

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 高冬平

作者单位： 中国科学院电子学研究所

项目金额： 30万元

中文摘要： 太赫兹辐射源在军用和民用领域具有极广阔的应用前景，是当前国内外学术研究的前沿。而太赫兹扩展互作用速调管（THz EIK）是产生太赫兹辐射最可行、最高效的紧凑型电真空器件之一。如何探索出THz EIK中多间隙耦合腔高频系统中复杂的非线性注-波互作用物理过程和找到抑制自激振荡和高频杂谱的方法是研制该类器件面临的最大难题。目前国内并没有能够模拟THz EIK互作用的自主软件，而国外最先进的软件主要是MAGIC，但它无法准确模拟某些新型复杂耦合结构，并且其计算资源消耗大、耗时长的弱点使其无法满足设计需求。 因此，本项目创新性地建立了将时域有限差分方法、粒子模拟思想、端口近似方法3者优点相结合的2.5维时域粒子模型，该模型不仅能确保模拟结果的准确性，将计算时长缩短为MAGIC的数十分之一，同时能模拟新型复杂耦合结构并揭示注-波互作用机理。本研究将为我国开展THz EIK的研制提供强有力的设计支持。

中文关键词： 太赫兹扩展互作用速调管；非线性注-波互作用；粒子模拟；；

英文摘要： TeraHertz radiation sources, being the leading edge of scientific research, have a promising future in military and civil area. TeraHertz Extended Interaction Klystron (THz EIK) is one of the most promising compact electronic vacuum devices providing TeraHertz radiation efficiently. The bottle-neck of developing THz EIK is how to study the complex physical phenomenon of nonlinear beam-wave interaction in multi-gap coupled cavities and to eliminate self-excited oscillation accurately and quickly. Presently, there is no any software developed by our country to simulate THz EIK. Meanwhile, MAGIC, mainly used by foreign researchers, can not simulate some of new complex coupled structrue and, is unfeasible in design process for costing great computational resources. Therefore, to solve above mentioned prolbem, this research aims at developing a 2.5-dimensional time domain model combined with Finite Defference Time Domain (FDTD) method, Particle-In-Cell (PIC) model, and Port-Approximation model. Based on 2.5D PIC model, a novel program will be developed to simulate the complex nonliear beam-wave interaction in THz EIK acculately and efficiently. Unquestionably, this research will provide strong support for the development of TeraHertz EIK in China.

英文关键词： THz Extended Interaction Klystron (THz EIK)；Nonlinear Beam-Wave Interaction；Particle-In-Cell (PIC)；；