Modeling and experiments of x-ray ablation of National Ignition Facility first wall materials
- Lawrence Livermore National Lab., CA (United States)
- California Univ., Berkeley, CA (United States)
This paper discusses results of modeling and experiments on the x-ray response of selected materials relevant to NIF target chamber design. X-ray energy deposition occurs in such small characteristic depths (on the order of a micron) that thermal conduction and hydrodynamic motion significantly affect the material response, even during the typical 10-ns pulses. The finite-difference ablation model integrates four separate processes: x-ray energy deposition, heat conduction, hydrodynamics, and surface vaporization. Experiments have been conducted at the Nova laser facility in Livermore on response of various materials to NIF-relevant x-ray fluences. Fused silica, Si nitride, B carbide, B, Si carbide, C, Al2O3, and Al were tested. Response was diagnosed using post-shot examinations of the surfaces with SEM and atomic force microscopes. Judgements were made about the dominant removal mechanisms for each material; relative importances of these processes were also studied with the x-ray response model.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 372655
- Report Number(s):
- UCRL-JC-123553; CONF-9606116-76; ON: DE96013438; TRN: 96:023295
- Resource Relation:
- Conference: Annual meeting of the American Nuclear Society (ANS), Reno, NV (United States), 16-20 Jun 1996; Other Information: PBD: 4 Jun 1996
- Country of Publication:
- United States
- Language:
- English
Similar Records
X-ray ablation measurements and modeling for ICF applications
Inertial confinement fusion ablator physics experiments on Saturn and Nova