Implosion symmetry and burn efficiency in ICF
The effects of long wavelength asymmetries of irradiation on the performance of reactor level ICF targets are reviewed. An analysis of the stages of formation of the hot-spot and ignition has been carried out, which led to the identification of the 1-D ignition margin and the spark convergence ratio as the parameters influencing the sensitivity of a target to these asymmetries. Evidence for the occurrence of the Rayleigh-Taylor instability in the stagnating target is also presented. The results of a parametric 2-D study of a family of high gain targets are presented. The aim of this study was the analysis of the target sensitivity to long wavelength non-uniformities of the driving pressure. General trends for gain degradation versus mode number and amplitude were found, and the crucial importance of the 1-D ignition margin was made apparent. From these preliminary results it appears that some room exists for the design of simple, high gain targets, although the constraints on the irradiation uniformity and the pulse shaping are quite severe.
Bibliographic Reference: Report: RT/NUCL/90/05 EN (1990) 31 pp.
Availability: Available from Servizio Studi e Documentazione, ENEA, Centro Ricerche Energia Frascati, C.P.65-00044 Frascati, Roma (IT)
Record Number: 199110507 / Last updated on: 1994-12-02
Original language: en
Available languages: en