Ignition target design and robustness studies for the National Ignition Facility
- Los Alamos National Lab., NM (United States); and others
Recent results are presented from two-dimensional LASNEX calculations of the indirectly driven hohlraum and ignition capsules proposed for the National Ignition Facility (NIF). The calculations concentrate on two capsule designs, the baseline design which has a bromine-doped plastic ablator, and the beryllium design which has a copper-doped beryllium ablator. Both capsules have a cryogenic fuel layer. Primary emphasis in these calculations is placed upon robustness studies detailing various sensitivities. These studies fall naturally into two categories, those performed with integrated modeling where the capsule, hohlraum, and laser rays all are modeled simultaneously with the laser power levels as the only energy input, and those performed in a capsule-only mode where an externally imposed drive is applied to the exterior of the ignition capsule and only the capsule performance is modeled. Integrated modeling calculations address sensitivities to, e.g., the laser pointing; among other things, capsule-only calculations address yield degradation due to the growth of hydrodynamic instabilities seeded by initial surface roughnesses on the capsules. Limitations of the calculational models and directions for future research are discussed. The results of the robustness studies performed to date enhance the authors` confidence that the NIF can achieve ignition and produce 10--15 MJ of capsule yield with one or more capsule designs.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36; W-7405-ENG-48
- OSTI ID:
- 161545
- Report Number(s):
- LA-UR-95-3886; CONF-951182-3; ON: DE96003149; TRN: AHC29601%%100
- Resource Relation:
- Conference: 37. annual meeting of the American Physical Society Division of Plasma Physics, Louisville, KY (United States), 6-10 Nov 1995; Other Information: PBD: [1995]
- Country of Publication:
- United States
- Language:
- English
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Integrated ignition calculations for indirectly driven targets
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