Simulation of microexplosion hydrodynamics in heavy ion fusion reactor chamber with wetted first wall

Abstract

Thermonuclear fusion flare, fireball expansion, and evaporation of the liquid-film chamber wall are simulated by combining two one-dimensional (1D) codes DEIRA and RAMPHY. The considered process is divided into two phases: the DEIRA code is used to simulate the fast ignition and burn of a cylindrical target with DT fuel and a lead tamper, while the RAMPHY code is applied to describe the subsequent quasi-spherical expansion of the fireball. By the end of the first phase, the neutron and X-ray output from the target as well as the debris motion are determined. The fast ions are practically fully absorbed by the lead tamper of the fusion target. At the second stage, which starts with the arrival of the main shock at the target surface, the fireball expansion and the behavior of the wall liquid film are considered. The fireball front propagates with a velocity close to the self-similar value. The liquid film is first evaporated by the X-ray pulse, and then by the heat flux generated when the fireball collides with the primary vapor layer. Mechanical loading on the liquid film remains within the 100-MPa range.