Application of the space-resolving flux detector for radiation measurements from an octahedral-aperture spherical hohlraum

Abstract

Space-resolving flux detection is an important technique for the diagnostic of the radiation field within the hohlraum in inertial confinement fusion, especially for the radiation field diagnostic in the novel spherical hohlraum with octahedral six laser entrance holes (LEHs), where localized measurements are necessary for the discrimination of the radiation flux from different LEHs. A novel space-resolving flux detector (SRFD) is developed at the SG-III laser facility for the radiation flux measurement in the first campaign of the octahedral spherical hohlraum energetics experiment. The principle and configuration of the SRFD system is introduced. The radiation flux from the wall of a gas-filled octahedral spherical hohlraum is measured for the first time by placing the SRFD system at the equatorial position of the SG-III laser facility, aiming at the hohlraum wall through one of the six LEHs. The absolute radiation flux from the re-emission area on the hohlraum wall is measured, and good consistency is found between the experimental data and the calculated data from a three-dimensional view factor analysis.

Characterization of radiation drive by measuring the localized re-emitted flux from the capsule in inertial confinement fusion experiments

“…For the determination of the specific location of the field of view, the x-rays emitted from the hohlraum were recorded with a witness imaging plate, as illustrated in figure 2(a). Note that there was a hole at the center of the imaging plate, which was also used as the defining aperture [34,35]. The image obtained in shot N062 is illustrated in figure 2(b), where the dash blue circle indicates the contour of the upper LEH.…”