DIMENSIONAL AND MATERIAL CHARACTERIZATION OF LMJ CAPSULES USING X-RAY PHASE CONTRAST

Speaker:
CHOUX, Alexandre; CEA Valduc; France

Authors:
Balland, Y.; CEA, Centre de Valduc; France
Barnouin, L.; CEA, Centre de Valduc; France
Busvelle, E.; Laboratoire des sciences de l’information et des systèmes; France
Choux, A.; CEA, Centre de Valduc; France
Dutt, V.; CEA, Centre de Valduc; France
Reverdy, L.; CEA, Centre de Valduc; France
Theobald, M.; CEA; France

ID: ECNDT-0220-2018
Session: X-ray radiography 3
Room: G3
Date: 2018-06-12
Time: 09:40 - 10:00

To perform experiments on the Laser Megajoule (LMJ) [1, 2], the CEA (commissariat à l’énergie atomique et aux énergies alternatives) Laser Targets Department builds up and develops capsules composed of anamorphous hydrogenated carbon. Some of them are doped with silicon or germanium and have impurities as oxygen.
These capsules have stringent dimensional specifications to match in terms of surface quality, wall thickness measurement, spherical uniformities, and rigorous elemental composition.
X-ray radiography is one of the devices used when characterizing capsules [3].

It allows having information on the outer and inner surfaces of the capsules. A phenomenon appears on some radiograph: the phase contrast. The knowledge of this physical phenomenon helps to improve the capsules characterization. Two approaches are developed to model this phenomenon [4, 5]. There are based on Born approximation [6].

In this work, the mathematical models are presented and results of wall thickness, roughness on outer and inner surfaces and elemental composition of capsules are given.