Simulation of laser plasma wakefield acceleration with external injection based on Bayesian optimization  

作　　者：Jianhua ZHONG Jiabao GUAN Lanxin LIU Guoxing XIA Jike WANG Yuancun NIE 钟建华;关家宝;刘兰忻;夏国兴;王纪科;聂元存

机构地区：[1]The Institute for Advanced Studies,Wuhan University,Wuhan 430072,People’s Republic of China 2 Department of Physics and Astronomy,University of Manchester,Manchester M139PL,United Kingdom

出　　处：《Plasma Science and Technology》2025年第4期22-29,共8页等离子体科学和技术(英文版)

基　　金：supported by Science and Technology Major Project of Hubei Province in China(No.2021AFB001)。

摘　　要：In laser wakefield acceleration,injecting an external electron beam at a certain energy is a promising approach for achieving a high-quality electron beam with low energy spread and low emittance.In this paper,the process of laser wakefield acceleration with an external injection at 10 pC has been studied in simulations.A Bayesian optimization method is used to optimize the key laser and plasma parameters so that the electron beam is accelerated to the expected energy with a small emittance and energy spread growth.The effect of the rising edge of the plasma on the transverse properties of the electron beam is simulated and optimized in order to ensure that the external electron beam is injected into the plasma without significant emittance growth.Finally,a high-quality electron beam with an energy of 1.5 GeV,a normalized transverse emittance of 0.5 mm·mrad and a relative energy spread of 0.5%at 10 pC is obtained.

关 键 词：laser wakefield acceleration Bayesian optimization external injection high quality electron beam(Some figures may appear in colour only in the online journal) 

分 类 号：O441.1[理学—电磁学]