Abstract
In indirect inertial confinement fusion (ICF), the prediction of gas pressures and mass flow rates in the hohlraum is critical for fielding the hohlraum film and the support tent. To this end, it is desirable to understand the gas filling and evacuation process through the microcapillary fill tube and the support tent. In this work, a unified flow simulation of the filling and evacuation processes through the microcapillary fill tube and the support tent in an ICF hohlraum was conducted to study the gas pressure and mass flow rate in the hohlraum. The effects of the support tent size and the microcapillary fill tube size on the critical pressure variation and pressure difference across the hole on the support tent are examined. The results indicate that an increase in the diameter of the hole and the hole number leads to a smaller pressure difference across the hole on the support tent. If the diameter of the hole on the support tent is larger than 0.06 mm, the critical pressure variation rate is nearly independent of the diameter and the hole number. Increases in the diameter and decreases in the length of the microcapillary fill tube induce a larger critical pressure variation rate and pressure difference across the hole, which is conductive to fielding the hohlraum film.
Highlights
In inertial confinement fusion (ICF), a capsule filled with deuterium-tritium is imploded to ignition and burns under appropriate conditions, which bring clean and sustainable energy [1,2,3,4,5]
Since we mainly focus on the gas flow of the hohlraum, neglecting changes in the temperature, the temperatures inside and outside the hohlraum Ti and To were set to be 298.15 K throughout the filling and evacuation processes
To elucidate the effect of the pressure variation rate on the gas flow in the hohlraum, this study investigated gas pressure characteristics during the gas evacuation and filling processes
Summary
In inertial confinement fusion (ICF), a capsule filled with deuterium-tritium is imploded to ignition and burns under appropriate conditions, which bring clean and sustainable energy [1,2,3,4,5]. Through a white-light interferometry approach, which can be as accurate as results using the destructive bubble method, the measurement of the fuel gas pressure of ICF targets with multiple-shells was carried out by Wang et al [16]. They studied the gas retention capability of ICF targets using interferometry with long-time vertical scanning. It is urgent to theoretically investigate the filling and evacuation processes in an inertial confinement fusion hohlraum with a support tent. The current study contributes to a fuller understanding of dynamic gas flow behaviors through the microcapillary fill tube and the support tent of the ICF hohlraum
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