Self-consistent particle-in-cell modelling of short pulse absorption and transport for high energy density physics experiments

8th International Conference on Inertial Fusion Sciences and Applications

Ramsay, M.G.^1,2 ; Arber, T.D.^2 ; Sircombe, N.J.^1,2

AWE Aldermaston, Reading

RG7 4PR, United Kingdom^1

CFSA, University of Warwick, Coventry

CV4 7AL, United Kingdom^2

关键词: High energy density physics;    High-density materials;    High-electron-density;    Laser interaction;    Particle in cell;    Particle-in-cell simulations;    Short-pulse lasers;    Two-dimensional simulations;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/688/1/012089/pdf
DOI  :  10.1088/1742-6596/688/1/012089

来源: IOP

【 摘 要 】

In order for detailed, solid density particle-in-cell (PIC) simulations to run within a reasonable time frame, novel approaches to modelling high density material must be employed. For the purposes of modelling high intensity, short pulse laser-plasma interactions, however, these approaches must be consistent with retaining a full PIC model in the low-density laser interaction region. By replacing the standard Maxwell field solver with an electric field update based on a simplified Ohm's law in regions of high electron density, it is possible to access densities at and above solid without being subject to the standard grid and time step constraints. Such a model has recently been implemented in the PIC code EPOCH. We present the initial results of a detailed two-dimensional simulation performed to compare the adapted version of the code with recent experimental results from the Orion laser facility.