物理学报2024，Vol.73Issue(19)：124-132,9.DOI:10.7498/aps.73.20240652
超过30 GeV的强激光锁相直接电子加速
Over-30-GeV intense laser phase-locked direct electron acceleration
摘要
Abstract
When an intense laser obliquely irradiates a solid,a pre-pulse will first ionize the solid surface,followed by the main pulse interacting with the plasma and ultimately being reflected by the plasma.Simultaneously,certain electrons within the plasma will be trapped in the accelerating phase of the laser field,subsequently gaining effective acceleration within the field,this phenomenon is known as phase-locked electron acceleration.Given the current intense lasers'electric field intensity nearing the TV/m range,electrons could potentially acquire energy levels on the order of hundreds of GeV or even TeV,provided they stay in the accelerating phase of the laser field long enough.Here,we initially use PIC(Particle-in-Cell)simulations to simulate the interaction process between laser pulses and plasma,thereby obtaining the properties of phase-locked electrons.In order to reduce computational demands,we turn to use a three-dimensional(3D)test particle model to calculate the subsequent interactions of these electrons with the reflected laser field.By this model,we obtain the data of the locked-phase electrons after having interacted with the reflected laser(Fig.(a)).Furthermore,we use this model to calculate the dynamical behavior of electrons under different initial conditions(Fig.(b)).Under the laser intensity of a0=350(a0 is the normalized laser vector potential),the energy of the electrons directly accelerated by the laser is enhanced to 32 GeV.In contrast,under the same laser intensity,the energy of the electrons accelerated by ponderomotive force is only 0.35 GeV.The research findings indicate that the strong laser with peak power around 10 PW can directly accelerate electrons to approximately 30 GeV.Additionally,this study outlines the optimal initial conditions for injecting electrons into the laser field and the final electron energy within the phase-locked acceleration mechanism,thereby establishing a calibration relationship with the laser field intensity.Given the continual enhancement of laser intensity and the potential application of the laser phase-locked electron acceleration mechanism to positron acceleration,this research holds promise for its implementation in fields such as miniaturized positron-electron colliders and high-energy gamma-ray sources.关键词
超高能电子加速器/激光直接电子加速/锁相电子加速/正负电子对撞机Key words
ultra-high energy electron accelerator/direct laser acceleration/phase-locked electron acceleration/electron-positron collider引用本文复制引用
朱翰辰,周楚亮,李晓锋,田野,李儒新..超过30 GeV的强激光锁相直接电子加速[J].物理学报,2024,73(19):124-132,9.基金项目
国家自然科学基金(批准号:12388102,12325409,U226720057)、基础研究特区计划(批准号:JCYJ-SHFY-2021-002)和中国科学院基础研究领域青年团队计划(批准号:YSBR-060)资助的课题. Project supported by the National Natural Science Foundation of China(Grant Nos.12388102,12325409,U226720057),the Shanghai Pilot Program for Basic Research-Chinese Academy of Science,Shanghai Branch(Grant No.JCYJ-SHFY-2021-002),and the Project for Young Scientists in Basic Research,Chinese Academy of Science(Grant No.YSBR-060). （批准号:12388102,12325409,U226720057）
