Charge Accretion Rate and Injection Radius of Ionized-Induced Injections in Laser Wakefield Accelerators

8th International Conference on Inertial Fusion Sciences and Applications

Zeng, Ming^1 ; Chen, Min^1 ; Sheng, Zheng-Ming^1

Key Laboratory for Laser Plasmas (Ministry of Education), Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai

200240, China^1

关键词: Accretion rate;    High quality;    Injection method;    Injection process;    Injection rates;    Laser wakefield accelerators;    Particle-in-cell simulations;    Transverse mode;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/688/1/012130/pdf
DOI  :  10.1088/1742-6596/688/1/012130

来源: IOP

【 摘 要 】

Ionization-induced injection has recently been proved to be a stable injection method with several advantages in laser wakefield accelerators. However, the controlling of this injection process aiming at producing high quality electron beams is still challenging. In this paper, we examine the ionization injection processes and estimate the injection rate with two-dimensional particle-in-cell simulations. The injection rate is shown to increase linearly with the high-Z gas density as long as its ratio is smaller than some threshold in the mix gases. It is also shown that by changing the transverse mode of the driving lasers one can control the injection rate.