Frequency domain laser ultrasound for inertial confinement fusion target wall thickness measurements.

ABSTRACT: In inertial confinement fusion experiments hollow, spherical mm-sized capsules are used as a container for nuclear fuel. To achieve maximum implosion efficiency, a perfect capsule geometry is required. This paper presents a wall thickness measurement method based on zero-group velocity guided elastic wave resonances. They are measured with a non-destructive, contactless frequency domain laser ultrasound microscopy system. Wall thickness measurements along the equator of a high-density carbon capsule with a diameter of around 2mm and a wall thickness of around 80µm excellently agree with infrared interferometry reference measurements. In addition, the multi-resonant nature of a spherical shell is studied by complementing experimental observations with plate dispersion calculations and finit

SUBMITTER: Ryzy M 

PROVIDER: S-EPMC12860733 | biostudies-literature | 2026 Apr

REPOSITORIES: biostudies-literature