The Particle-Tracking Simulation of a New Photocathode RF Gun in the Free-Electron Laser Facility, KU-FEL

Particles

article

Yuhao Zhao¹  Heishun Zen¹  Hideaki Ohgaki¹ 

[1] Institute of Advanced Energy, Kyoto University

关键词: photocathode RF gun;    high-bunch charge;    free electron laser oscillator;    particle-tracking simulation;   

DOI  :  10.3390/particles6020037

学科分类：社会科学、人文和艺术（综合）

来源: mdpi

【 摘 要 】

A project is underway that aims to generate attosecond pulses via high-harmonic generation in rare gases, driven by extremely short and highly intense pulses from free-electron-laser oscillators. For this purpose, it has been planned that a new photocathode RF gun, dedicated to high-bunch-charge operation, will be installed at the KU-FEL (Kyoto University Free Electron Laser) oscillator facility. In this study, RF guns with two different structures (1.6-cell and 1.4-cell) were compared, from the perspective of exploring the possibility of introducing bunch-interval modulation, which is important for achieving high extraction efficiency in the FEL oscillator. As a result, it was confirmed that the introduction of bunch-phase modulation would be possible only in the case of the 1.6-cell RF gun. After the structure of the RF gun was decided on, particle-tracking simulations were performed, to study the electron-beam parameters using the 1.6-cell RF gun and 1 nC bunch charge. The results showed that we could obtain the peak current of 1 kA without a large degradation of the other parameters.

【 授权许可】

CC BY