PIC Simulations of Ka-band Ultra-Short Pulse Oscillator with Resonance Cyclotron Absorber in the Feedback Loop
PIC Simulations of Ka-band Ultra-Short Pulse Oscillator with Resonance Cyclotron Absorber in the Feedback Loop
复制标题
反馈环路中带有谐振回旋吸收器的Ka波段超短脉冲振荡器的PIC仿真
DOI：
10.1051/epjconf/201818701021
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Jelonnek
中科院分区：
文献类型：
--
作者：
Ginzburg;Denisov;Vilkov;Zotova;Sergeev;Samsonov;Jelonnek
文献[1，2]指出，在由放大器和反馈回路中的非线性（饱和）吸收器组成的两段微波振荡器中，可以产生周期性的超短微波脉冲（USP）序列。在这样的系统中，脉冲形成的过程是基于被动锁模效应，这在激光物理学中是众所周知的[3]。目前，应用物理研究所正在研制以宽带螺旋波导回旋行波管[4]为有源单元的Ka波段USP振荡器。可饱和吸收体将实现在一个辅助部分的基础上的回旋共振相互作用的初始直线磁化的电子束。在这种情况下，由于陀螺频率对电子能量的相对论依赖性，提供了吸收的非线性。USP振荡器的基本参数已被定义在一个简单的平均模型的基础上。基于CST Studio Suite [5]软件，对该系统进行了全尺寸粒子模拟，旨在根据计划实验的真实的条件优化参数。为了进行模拟，开发了螺旋波导放大器和回旋加速器吸收器相对安装的计算机模型（见图1）。回旋行波管工作在二次回旋谐波，而基波回旋共振用于吸收体单元。从阴极端开始，两个部分由共振反射器界定。具有给定参数的独立电子束从相应截面的左右两端进入计算空间，相互作用后在强横向磁场中偏转到波导壁。在振荡器部分之间有一个偏振选择波导耦合器，它允许模拟有用功率到负载的分支。因此，初始微波脉冲可以被馈送到
In [1, 2] it was shown that periodical trains of ultrashort microwave pulses (USP) can be produced in a two-section microwave oscillator consisting of an amplifier and a nonlinear (saturable) absorber in the feedback loop. In such a system, the process of pulse formation is based on the effect of passive modelocking which is well known in laser physics [3]. At the present moment, the Ka-band USP oscillator with a broadband helical-waveguide gyro-TWT [4] as an active unit is under development at the Institute of Applied Physics. The saturable absorber will be realized in an auxiliary section based on the cyclotron resonance interaction with an initially rectilinear magnetized electron beam. In this case the nonlinearity of absorption is provided due to relativistic dependence of a gyrofrequency on the electrons energy. The basic parameters of the USP oscillator have been defined on the basis of a simple averaged model. This paper is devoted to the full-scale particle-in-cell (PIC) simulations of such a system based on the software CST Studio Suite [5] aimed to optimize the parameters taking into account the real conditions of the planning experiment.For simulations the computer model has been developed, in which the helical-waveguide amplifier and the cyclotron absorber were installed opposite each other (see Fig. 1). The gyro-TWT operates at the second cyclotron harmonic while the fundamental cyclotron resonance is used in the absorber unit. From the cathode ends both sections were bounded by resonance reflectors. The independent electron beams with the given parameters were entered the calculated space from the left and right ends of the corresponding sections and, after interaction, deflected in a strong transverse magnetic field to the waveguide wall. Between the oscillator sections there was a polarization-selective waveguide coupler which allows simulating the branching of the useful power to the load. Thus, the initial microwave pulse could be fed to
通过在放大和非线性吸收状态下运行的两个耦合螺旋陀螺行波管产生超短微波脉冲序列
影响因子：
2.2
作者：
Ginzburg;Denisov;Vilkov;Sergeev;Zotova;Samsonov;Mishakin
通讯作者：
Mishakin
基于反馈环路中具有可饱和吸收体的电子振荡器中的无源锁模效应生成“巨大”超短微波脉冲
DOI：
--
发表时间：
2016
期刊：
影响因子：
--
作者：
N. Ginzburg;G. Denisov;M. Vilkov;I. Zotova;A. Sergeev
通讯作者：
A. Sergeev