Effect of the LEHs film transmissivity on spherical hohlraum cryogenic target after the shield is removed

Abstract

• Effect of the film transmissivity on spherical hohlraum cryogenic target has been investigated. • The maximum temperature difference on the target surface rises with the increase of transmissivity. • Low LEHs film transmissivity can make the temperature field in the hohlraum more stable. In this paper, computational fluid dynamics (CFD) software ANSYS Fluent was used to study the influence of Laser Entrance Holes (LEHs) film transmissivity on the indirect-drive cryogenic inertial confinement fusion (ICF) targets after the shield is removed. The results show that when LEHs film transmissivity (t LEHs ) increases from 0.01 to 1 under the steady-state calculation, the maximum temperature difference on the target surface increases by nearly 141 %. The influence of t LEHs on the target surface temperature field is particularly obvious after the shield is opened. The maximum target surface temperature rises to 3140 mK and the maximum surface temperature difference is 130 mK at the dynamic equilibrium state. However, the internal temperature field of the hohlraum is not significantly affected by Infrared radiation (IR) for t LEHs = 0.01. The maximum temperature increment on the target surface is 90 mK, and the maximum surface temperature difference is only 2.5 mK. Low LEHs film transmissivity can effectively restrain the influence of environmental radiation and keep the temperature field in a stable state in the hohlraum.