Optimization of High Power Terahertz Surface Wave Oscillator

张海 1; 王建国 1; 2; 童长江 2

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Optimization of High Power Terahertz Surface Wave Oscillator

更新时间：2025-12-08

- Optimization of High Power Terahertz Surface Wave Oscillator
- Vol. 42, Issue 12, Pages: 1531-1536(2008)
- 作者机构：
  
  西安交通大学电子与信息工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN128
- Online First：10 December 2008，
  
  Published：2008
- 稿件说明：
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张海 1, 王建国 1, 2, et al. Optimization of High Power Terahertz Surface Wave Oscillator[J]. 2008, 42(12): 1531-1536.
DOI：

张海 1, 王建国 1, 2, et al. Optimization of High Power Terahertz Surface Wave Oscillator[J]. 2008, 42(12): 1531-1536. DOI：

摘要

提出了一种新型过模高功率太赫兹表面波振荡器

其中慢波系统是由一段过模圆柱波导内壁沿圆周方向平行挖去若干个均匀环形槽构成

相邻槽间距固定不变.该结构较之传统的单模结构能有效降低管内电场强度

避免场击穿

提高系统的功率容量.同时

提出了一种基于表面波工作机制的综合选模方案

即通过电动力学结构选模及电子注参数选模相结合

使系统稳定工作于单模表面波状态

从而达到模式选择的目的.该方法能有效解决过模慢波系统内的模式竞争问题.利用2.5维粒子模拟程序UNIPIC对振荡器进行了物理设计和性能优化

得到了一套最优工作参数.在500 kV电子注电压、1.5 kA电子注电流条件下

模拟得到了42 MW 的峰值功率输出

振荡频率高于0.14 THz

模式为TM

信号的时域波形及频谱特性良好.

Abstract

A novel high power terahertz surface wave oscillator was proposed to obtain the high power terahertz wave sources with high efficiency in steady state. The device consists of a large cross-section(overmoded)slow wave system(SWS)with a unique profile of wall radius specifically designed to support surface wave and to provide a strong beam-wave coupling at moderate voltage. This kind of SWS can decrease the field strength in the structure efficiently and enhance the power capacity of device in the THz regime. A comprehensive method is employed to avoid mode competition in this overmoded situation

that is

to move the operating point to the upper cut off of the transmission band of dispersion curve and to ensure only the TM

mode owns the characteristic of slow surface wave. The 2.5D particle-in-cell simulation program UNIPIC is used to study the

effects of device parameters which are critical to the optimization of output power in a prototype 0.14THz surface wave oscillator. A set of optimal operating parameters are achieved. Under the condition of 500 kV voltage and 1.5 kA current

the output power of 42 MW is achieved at the frequency of 0.14THz in the TM

mode with perfect time plot and fine spectrum characteristic.

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references

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