Update on specifications for NIF ignition targets and their rollup into an error budget
Targets intended to produce ignition on NIF are being simulated and the simulations are used to set specifications for target fabrication. Recent design work has focused on designs that assume only 1.0 MJ of laser energy instead of the previous 1.6 MJ. To perform with less laser energy, the hohlraum has been redesigned to be more efficient than previously, and the capsules are slightly smaller. The main-line hohlraum design now has a SiO2 foam fill, a wall of U-Dy-Au, and shields mounted between the capsule and the laser entrance holes. Two capsule designs are being considered. One has a graded doped Be(Cu) ablator, and the other graded doped CH(Ge). Both can perform acceptably with recently demonstrated ice layer quality, and with recently demonstrated outer surface roughness. Smoothness of the internal interfaces may be an issue for the Be(Cu) design, and it may be necessary either to polish partially coated shells or to improve process control so that the internal layers are smoother. Complete tables of specifications are being prepared for both targets, to be completed this fiscal year. All the specifications are being rolled together into an error budget indicating adequate margin for ignition with the new designs.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 919218
- Report Number(s):
- UCRL-PROC-213510; TRN: US0806320
- Resource Relation:
- Journal Volume: 49; Journal Issue: 4; Conference: Presented at: Sixteenth Target Fabrication Specialists Meeting, Scottsdale, AZ, United States, May 01 - May 05, 2005
- Country of Publication:
- United States
- Language:
- English
Onset of nonlinear saturation for Rayleigh-Taylor growth in the presence of a full spectrum of modes
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journal | June 1989 |
The physics basis for ignition using indirect-drive targets on the National Ignition Facility
|
journal | February 2004 |
Update on NIF Indirect Drive Ignition Target Fabrication Specifications
|
journal | March 2004 |
Increasing robustness of indirect drive capsule designs against short wavelength hydrodynamic instabilities
|
journal | May 2005 |
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