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arXiv 2202.02822physics.plasm-ph
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低能电子注入直接加速Laser的相空间分析

Phase space consideration of low energy electron injection for Direct Laser Acceleration

E. Starodubtseva, I. Tsymbalov, D. Gorlova, K. Ivanov, A. Savel'ev

摘要:

分析了数百MeV电子直接激光加速(DLA)电离注入的可行性。有效注入的标准确定范围内的背景和通道内的等离子体参数,激光强度等被发现使用从简化的分析模型推导出的系统的相图。在相空间中找到的最佳轨迹对应于具有低(几eV)初始能量的电子经历$\sim$ 10 $^9$倍的能量增益。为了实现这一点,电子密度应该是临界密度的百分之几,而通道内电子密度应该是$\sim$的三分之一。解析获得的依赖于初始电子的纵向和横向动量的能量增益对应的精确的数值模拟的结果,在等离子体通道中的电子运动。该方法可为进一步研究DLA中电子注入随等离子体和激光参数以及初始电子能量的变化规律奠定基础。

英文摘要:

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.

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