Description
Numerical Study of the impact of laser irradiation parameters on X-ray Conversion of different materials
Mathieu Peret1, Olivier Poujade1
CEA DAM-DIF, 91297 Arpajon, France
Abstract:
The conversion of laser energy into X-ray emissions in plasma is of fundamental interest for indirect drive inertial confinement fusion (ICF) and has broader applications in X-ray source production. This conversion can be decomposed in two processes: the absorption of laser light energy and the re-emission of this energy as X-ray radiations.
This study employs the radiative hydrodynamics code TROLL to investigate the impacts of target irradiation parameters (laser flux Φ_L, wavelength λ_L, …) and target composition (atomic number of the target materials Z) on laser absorption and X-ray re-emission. The analysis decomposes the effects of physical models, such as inverse Bremsstrahlung absorption (IBA) and electronic conduction flux, on X-ray conversion. Metamodels are fitted on the data in order to be representative of the simulation results. Comparison with previous experimental data [1] reveal qualitative agreement regarding the dependencies of the conversion rates, with simulations yielding higher values. This latter point highlights the need for improved models to achieve quantitative accuracy.
Keywords: Inertial Confinement Fusion, Laser-Plasma Interactions, X-ray Conversion, Radiative Hydrodynamics
References:
[1] R. Dautrey, J.P. Watteau, La fusion themonucléaire inertielle par laser, Part.1, Vol.2, Chap.IV-II, (1994)