Numerical simulation of vacuum electron acceleration by interaction of intense laser with conical target
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摘要: 真空激光加速机制具有加速场梯度大、加速电子电量高的优点，目前制约真空加速机制研究发展的主要问题是如何产生具有一定初速度的电子并将其注入加速场。提出了一种利用强激光与锥型靶相互作用产生高能电子并实现真空加速的新方法，利用二维PIC(Particle-in-cell)粒子模拟程序对这一方法进行了研究。模拟结果显示，对于光强为1021 W/cm2量级的高斯激光脉冲，产生了能量为GeV量级、发散角约为1°的强流快电子束。此外还通过理论解析和参数模拟研究了靶半径对这种超热电子加速机制的影响。Abstract: Vacuum laser acceleration (VLA) has the advantages of large gradient of acceleration field and large charge of collimated electrons. For certain topics, the production of electrons with initial velocity and the injection of these electrons in vacuum are main problems restricting the development of VLA. A new vacuum laser acceleration scheme is proposed in this paper, in which an ultra-short ultra-intense laser pulse is grazing incident into a cone target.Two-dimensional particle-in-cell simulation is used to confirm this acceleration scheme, which can produce collimated GeV-class electron beams in millimeters. The intense laser pulse is a linearly y-polarized laser with intensity of 1021 W/cm2. The effect of radius of the target is studied in this paper.
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图 2 高斯激光在真空、平面间隙靶与锥形靶中位于y=8 μm处的纵向激光电场分布
Figure 2. Spatial distribution of longitudinal electric field at y=8 μm in vacuum, gap target and cone target
图 3 在t=160 fs时刻，电子密度分布
Figure 3. Spatial distribution of the electron density at t=160 fs
图 4 纵向激光电场与激光相速度横向分布图
Figure 4. Longitudinal electric field and transverse distribuition of phase velocity
图 5 粒子追踪(a) 轨迹和动能，(b) 横向和纵向动量
Figure 5. Particle tracing (a) trajectory and kinetic energy, (b)transverse momentum(py) and longitudinal momentum(px)
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