Implosion symmetry requirements for high gain ICF
Some aspects of the problem of the implosion symmetry in Inertial Confinement Fusion (ICF) are discussed, with particular reference to heavy ion beam fusion. The physics of ignition of a target imploded by a driving pressure with long wavelength (low-l Legendre modes) asymmetries has been studied by means of 2-D simulations. A parametric study shows that the tolerable level of non-uniformity is a decreasing function of l, with the actual values depending on the specific target features (such as convergence ratio and ignition margin). The isobaric fuel model of gain is then used to show how symmetry constraints (which limit the convergence ratio and the Hohlraum transfer efficiency) affect the fuel energy gain. By using a model of ion beam energy conversion to X-rays, the gain of a class of indirectly driven targets is also estimated as a function of the relevant beam parameters.
Bibliographic Reference: Report: RT/NUCL/90/44 EN (1991) 14 pp.
Availability: Available from Servizio Studi e Documentazione, ENEA, Centro Ricerche Energia Frascati, C.P. 65-00044 Frascati, Roma (IT)
Record Number: 199210214 / Last updated on: 1994-12-02
Original language: en
Available languages: en