Progress in Target Design for IFE for Ion Beams and Lasers
Critical to the success of high gain ion beam driven targets for IFE is the tradeoff between target gain and the required focal spot size. A target design has been developed which uses the internal structure of the hohlraum to achieve radiation symmetry using beam spots with almost triple the allowed focal spot area relative to the earlier distributed radiator designs at comparable driver energy. An analysis is presented of the tradeoff between implosion robustness and the target fabrication specifications for survival against hydrodynamic instabilities during the implosion. A key issue for laser driven direct drive (DD) targets is control of hydrodynamic instability growth while achieving adequate gain for IFE. The goal of DD targets for IFE is to maximize gain through use of features such as wetted foams and laser zooming to increase absorption and use of a high-z coating to reduce laser imprint and achieve optimal control of instability growth. Because of advances in hohlraum design, laser driven indirect drive targets may have adequate gain for IFE for laser drivers with an efficiency of 10% or more. A key issue for the fast ignition concept is the ability to couple the hot electrons produced in high intensity laser matter interaction into the dense imploded core of an implosion. Indirect drive designs with a re-entrant cone make it possible to keep the dense core within about 100 {micro}m of the laser absorption point.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 15002752
- Report Number(s):
- UCRL-JC-146185; TRN: US200418%%89
- Resource Relation:
- Conference: Second International Conference on Inertial Fusion Sciences and Applications, Kyoto (JP), 09/09/2001--09/14/2001; Other Information: PBD: 5 Nov 2001
- Country of Publication:
- United States
- Language:
- English
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