Angular radiation temperature simulation for time-dependent capsule drive prediction in inertial confinement fusion

Abstract

The x-ray drive on a capsule in an inertial confinement fusion setup is crucial for ignition. Unfortunately, a direct measurement has not been possible so far. We propose an angular radiation temperature simulation to predict the time-dependent drive on the capsule. A simple model, based on the view-factor method for the simulation of the radiation temperature, is presented and compared with the experimental data obtained using the OMEGA laser facility and the simulation results acquired with VISRAD code. We found a good agreement between the time-dependent measurements and the simulation results obtained using this model. The validated model was then used to analyze the experimental results from the Shenguang-III prototype laser facility. More specifically, the variations of the peak radiation temperatures at different view angles with the albedo of the hohlraum, the motion of the laser spots, the closure of the laser entrance holes, and the deviation of the laser power were investigated. Furthermore, the time-dependent radiation temperature at different orientations and the drive history on the capsule were calculated. The results indicate that the radiation temperature from “U20W112” (named according to the diagnostic hole ID on the target chamber) can be used to approximately predict the drive temperature on the capsule. In addition, the influence of the capsule on the peak radiation temperature is also presented.

Optimization of tungsten-doped high density carbon target in inertial confinement fusion

“…In figure 5, the field of views of the two M-XRDs and TGS are different. It is obtained by using the three-dimensional view-factor code IRAD3D [30,31]. The total size of the laser spot in the field of view increases with the view angle.…”

A novel three-axis cylindrical hohlraum designed for inertial confinement fusion ignition

“…Due to the single-cone design for TACH, it is hard to control the time-varying radiation drive asymmetry by beam phasing technology, so it is crucial to study the time-varying symmetry of TACH. The symmetry can be studied by use of a view-factor model 21 22 23 . In order to simplify the analysis, the radiation intensity of the laser spots and that of the reemission wall are assumed to be uniformly distributed respectively.…”

“…So it is crucial to study the time-varying symmetry of the single-cone TACH. The time-varying symmetry of TACH has been studied by use of a view-factor model [21][22][23] . In order to simplify the analysis, the radiation intensity of the laser spots and the reemission wall are assumed to be uniform distributed.…”

Preliminary experiments on hohlraum-driven double-shell implosion at the ShenGuang-III laser facility

“…The initial driving asymmetry was calculated by IRAD3D [30][31][32]. IRAD3D code is a 3D view-factor code.…”