超热电子在稀薄等离子体中的有质动力加速
Ponderomotive acceleration of hot electrons in tenuous plasmas
摘要：
在假设激光脉冲长度小于等离子体波长的条件下，导出了相对论电子以任意动量注入线偏振激光脉冲在稀薄等离子体中传输时的振荡中心哈密顿量。对于在强激光驱动下与离子碰撞时产生的热电子，确定了多种有质动力加速机制，并且在等离子体密度低至10^17 cm-3时，激光色散会影响该过程。假设a/gamma_g << 1，阻止了冷等离子体的净加速，还证明了从初始能量gamma_0 <~ Gamma加速的热电子的归一化能量gamma不超过Gamma ~ a gamma_g，其中a是归一化激光场，gamma_g是群速度洛伦兹因子。然而，γ ~ γ是在很宽的初始条件范围内实现的，因此预测了热电子分布的截止。
英文摘要：
The oscillation-center Hamiltonian is derived for a relativistic electron injected with an arbitrary momentum in a linearly polarized laser pulse propagating in tenuous plasma, assuming that the pulse length is smaller than the plasma wavelength. For hot electrons generated at collisions with ions under intense laser drive, multiple regimes of ponderomotive acceleration are identified and the laser dispersion is shown to affect the process at plasma densities down to 10^17 cm-3. Assuming a/gamma_g << 1, which prevents net acceleration of the cold plasma, it is also shown that the normalized energy gamma of hot electrons accelerated from the initial energy gamma_0 <~ Gamma does not exceed Gamma ~ a gamma_g, where a is the normalized laser field, and gamma_g is the group velocity Lorentz factor. Yet gamma ~ Gamma is attained within a wide range of initial conditions; hence a cutoff in the hot electron distribution is predicted.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
