论文标题
直接激光加速度低能电子注入的相空间考虑
Phase space consideration of low energy electron injection for Direct Laser Acceleration
论文作者
论文摘要
通过分析研究了数百个MEV的电子直接激光加速度（DLA）的电离注射可行性。使用从简化的分析模型中推导的系统的相位肖像发现了有效注射确定背景和渠道血浆参数，激光强度等的标准。相位空间中发现的最佳轨迹对应于低（少数EV）的初始能量$ \ sim $ 10 $^9 $乘以能量增益。为此，电子密度应为临界密度的百分之几，而通道内电子密度应为$ \ sim $ \ sim $ 3倍。能量增益对初始电子纵向和横向动量的分析依赖性很好地对应于等离子体通道中电子运动的精确数值模拟的结果。开发的方法可以为在DLA变化的血浆和激光参数以及初始电子能量中进一步研究电子注入的基础。
Feasibility of ionization injection for Direct Laser Acceleration (DLA) of electrons up to hundreds of MeV was studied analytically. Criteria for effective injection determining range of background and in-channel plasma parameters, laser intensity, etc. were found using phase portraits of the system deduced from the simplified analytical model. The found optimal trajectory in the phase space corresponds to the electron with low (few eV) initial energy experiencing $\sim$10$^9$ times energy gain. For this to occur, electron density should be a few percent of the critical density, while the in-channel electron density should be $\sim$3 times lower. The analytically obtained dependence of the energy gain on the initial electron longitudinal and transverse momenta corresponds well to the results of exact numerical simulations of an electron motion in the plasma channel. Developed approach can form the basis for further studies of electron injection in DLA varying plasma and laser parameters as well as initial electron energies.
