Impact of resonance absorption on simulations of laser direct-drive implosions

Abstract In conventional hydrodynamic simulations of laser fusion, the modeling of laser energy deposition typically only considers collisional absorption. However, resonance absorption, as another critical energy deposition mechanism, should also be incorporated. This paper presents the implementation of a resonance absorption model in MULTI-IFE, a one-dimensional hydrodynamic simulation code. In a laser direct-drive implosion simulation, resonance absorption significantly enhances energy deposition. For double-cone ignition (DCI) target implosion simulations, resonance absorption improves the implosion performance parameters. Furthermore, employing GAFFER, a genetic algorithm-based machine learning tool for laser pulse optimization, we can design an implosion with larger fusion gain of 196 for the fast ignition scheme by incorporating resonant absorption in the simulations.