PROTON FAST IGNITION OF A CYLINDRICAL DT TARGET ENCLOSED IN A STATIONARY HEAT-INSULATED SHELL
K. V. Khishchenko, A. A. Charakhchian
VANT. Ser.: Mat. Mod. Fiz. Proc 2016. Вып.4. С. 51-59.
The paper considers a two-dimensional axially-symmetric problem of fast ignition of a pre-compressed cylindrical target with a DT mixture enclosed in a stationary heat-insulated shell. The target is ignited on the end by a proton beam, the intensity of which does not depend on the radial coordinate. The difference from the one-dimensional problem is that the fusion alpha particles and the self-radiation of plasma freely emerge from the fuel through the side boundary with the shell. The threshold ignition energy for the mixture densities of 22 and 110 g/cm3 is shown to be about one tenth of that in the known case without the shell and with a beam radius much smaller than the target radius. As compared to the problem of interest, the quasi-one-dimensional model developed earlier understates the threshold ignition energy with respect to the radius by a factor of four for the given beam intensity. Keywords: cylindrical ICF target, fast ignition, ignition energy.
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