Extended particle absorber for efficient modeling of intense laser–solid interactions

An extended thermal particle boundary condition is devised to more efficiently and accurately model laser–plasma interactions in overdense plasmas. Particle-in-cell simulations of such require many particles per cell, a large region background plasma often necessary correctly mimic semi-infinite avoid electron refluxing from truncated plasma. For long-pulse lasers picoseconds, constraints can become prohibitively expensive. Here, an (absorber) designed that instantaneously stops re-emits energetic streaming toward the simulation over defined region, allowing sufficient time space for suitably cool return current develop Tunable parameters absorber are explained, using with 3-ps laser shown reproduce those causally separated while requiring only 20% number particles.