A review of the ablative stabilization of the Rayleigh-Taylor instability in regimes relevant to Inertial Confinement Region. Revision 1
- and others
It has been recognized for many year`s that the most significant limitation of ICF is the Rayleigh-Taylor (R-T) instability. It limits the distance an ablatively driven shell can be moved to several times its initial thickness. Fortunately material flow through the unstable region at velocity v{sub A} reduces the growth rate to {radical}{sub 1+kL}/{sup kg} {minus}{beta}kv{sub A} with {beta} from 2-3. In recent years experiments using both x-ray drive and smoothed laser drive to accelerate foils have confirmed our understanding of the ablative R-T instability in planar geometry. The growth of small initial modulations on the foils is measured for growth factors up to 60 for direct drive and 80 for indirect drive. For x-ray drive large stabilization is evident. After some growth, the instability enters the non-linear phase when mode coupling and saturation are also seen and compare well with modeling. Normalized growth rates for direct drive are measured to be higher, but strategies for reduction by raising the isentrope are being investigated. For direct drive, high spatial frequencies are imprinted from the laser beam and amplified by the R-T instability. Modeling shows an understanding of this ``laser imprinting.``
- Research Organization:
- Lawrence Livermore National Lab., CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 10133811
- Report Number(s):
- UCRL-JC-115537-Rev.1; CONF-931132-1-Rev.1; ON: DE94008300; TRN: 94:006481
- Resource Relation:
- Conference: Fall meeting of the Plasma Physics Division of the American Physical Society,St. Louis, MO (United States),1-5 Nov 1993; Other Information: PBD: Dec 1993
- Country of Publication:
- United States
- Language:
- English
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