太赫兹带状注器件

Terahertz sheet beam vacuum electron devices

带状注是指束流截面近似为矩形或椭圆形的电子注,且具有大的宽高比。相对于传统的圆形注,带状注具有很多优点,例如大电流和大互作用面积等。由于太赫兹波具有高频率、宽频带、高传输速率等优点,因此太赫兹科学与技术近年来发展迅速。作为一种新型的真空电子器件,太赫兹带状注器件在高功率、高增益、高效率及小型化方面具有良好的技术优势。但是,带状注在传输过程中易出现Diocotron不稳定性,难以保持长距离稳定的聚焦传输,从而导致带状注的技术优势难以发挥。本文综述了带状注的产生成形方式和聚焦传输方法,以及太赫兹带状注器件的研究进展,同时讨论了它所面临的挑战和未来的发展方向。

Sheet beam is a kind of electron beam,whose cross-section is approximate rectangular or elliptical shape with high aspect ratio.Compared with conventional pencil beam,sheet beam has many advantages,such as high beam current and large interaction area.Terahertz science and technology have got rapid development in recent years owing to its high frequency,wide bandwidth,high-speed transmission rate,and other advantages of terahertz waves.As a kind of new-type vacuum electron devices,terahertz sheet beam devices have excellent performance such as high power,high gain,high efficiency,and miniaturization.However,it is difficult for sheet beam to keep stable transport over a long distance due to the existence of Diocotron instability,which cannot lead to fully demonstrating its technical advantages.This paper briefly summarizes the generation,formation,and focusing methods of sheet beam,and then introduces the state-of-the-art of terahertz sheet beam devices.Finally,the challenges and development tendencies are discussed.