An Overview of the Latest HED Target Fabrication Developments at LLNL
Abstract
The engineering team at LLNL builds precision laser targets for NIF and Omega, the physics demands for these create a constant need for process development. As physicists understand more and diagnostics improve, there is greater demand for precision in fabrication, metrology, and documentation of as-built targets. A NIF FY04 Hydrodynamic campaign was run and these targets are discussed. A simple design change to meet a physics requirement may require an entirely new manufacturing process a radiation transport target shows this. The ignition double shell campaign in FY03 highlights the required manufacturing complexity. In FY04 and beyond, the demands to meet production needs require the team to look at ways to produce targets more efficiently. Batch processing techniques are being developing to meet these precision targets specifications and increased quantities. A low temperature Rayliegh Taylor target shows how multiple precision targets can be fabricated out of a single precise large disk. EOS targets require total thickness variation and parallelism requirements of 100 nm over 1 mm areas, and large precision disks are a way of meeting these specifications. The required level of precision in the metrology of these targets also poses a significant challenge, and in some cases, the manufacturing process must be integrated with and designed around the metrology requirements. This work was performed under the auspices of the U.S. DOE, by the UC, LLNL, under contract W-7405-ENG-48
- Publication:
-
APS Division of Plasma Physics Meeting Abstracts
- Pub Date:
- November 2004
- Bibcode:
- 2004APS..DPPFM2005H