Milder A L, Le H P, Sherlock M, Franke P, Katz J, Ivancic S T, Shaw J L, Palastro J P, Hansen A M, Begishev I A, Rozmus W, Froula D H
Laboratory for Laser Energetics, 250 E. River Road, Rochester, New York 14623, USA.
Department of Physics and Astronomy, University of Rochester, Rochester, New York 14623, USA.
Phys Rev Lett. 2020 Jan 17;124(2):025001. doi: 10.1103/PhysRevLett.124.025001.
The picosecond evolution of non-Maxwellian electron distribution functions was measured in a laser-produced plasma using collective electron plasma wave Thomson scattering. During the laser heating, the distribution was measured to be approximately super-Gaussian due to inverse bremsstrahlung heating. After the heating laser turned off, collisional ionization caused further modification to the distribution function while increasing electron density and decreasing temperature. Electron distribution functions were determined using Vlasov-Fokker-Planck simulations including atomic kinetics.
利用集体电子等离子体波汤姆逊散射，在激光产生的等离子体中测量了非麦克斯韦电子分布函数的皮秒演化。在激光加热过程中，由于逆轫致辐射加热，测量到的分布近似为超高斯分布。加热激光关闭后，碰撞电离导致分布函数进一步改变，同时电子密度增加，温度降低。使用包括原子动力学的弗拉索夫-福克-普朗克模拟确定电子分布函数。
