Determination of a focusing system parameters in generation of THz radiation by bunch train

16th International Conference of Students and Young Scientists "Prospects of Fundamental Sciences Development"

自然科学（总论）

Altmark, A.^1 ; Lesiv, N.^2 ; Mukhamedgaliev, K.^3

Department of Physics, St.-Petersburg State Electrotechnical University, St. Petersburg, Russia^1

Department of Electronic Instruments and Devices, St.-Petersburg State Electrotechnical University, St. Petersburg, Russia^2

Department of Photonics, St.-Petersburg State Electrotechnical University, St. Petersburg, Russia^3

关键词: Analytic expressions;    Dielectric-loaded waveguides;    Focusing system;    High frequency HF;    New parameters;    Rectangular geometry;    Terahertz radiation generations;    Transverse beams;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/597/1/012054/pdf
DOI  :  10.1088/1757-899X/597/1/012054

学科分类：自然科学（综合）

来源: IOP

【 摘 要 】

It is present electron optics optimization for terahertz radiation generation by a sequence of short electron bunches passing through the dielectric loaded waveguide. In this method the superposition of individual bunch wakefields is used to selectively excite high frequency TM0n modes in a slow-wave structure. The main problem of this scheme is the transverse beam instability that limits the length of THz radiation wave packet. The main goal of this paper is a new parameter optimization algorithm for the FODO focusing system. The numerical modelling of the beam dynamics was performed in the original code "Dielectric waveguide" which utilizes analytic expression of the Green's function for the dielectric loaded waveguides with cylindrical and rectangular geometries.