Analysis of Target Implosion Irradiated by Proton Beam. 1: Beam Interaction with Target Plasma

摘要

Numerical simulations and analyses are given for the implosion of a hollow shell target driven by proton beams. The target consists of layers of Pb, Al, and DT. The Pb and Al layers play roles of a tamper and a pusher, respectively. The main part of the beam energy is deposited in the Al layer. But the process of deposition depends much on the distribution of incident angles and particle energies. As the Al layer is heated by proton beams, the layer expands and pushes the DT layer toward the target center. This kind of implosion motion is examined by using a similar solution for the slab model. The effect of inhomogeneities on implosion is shown to be severe. The fluctuation of temperature in the Al layer must be less than 10% and the deviation of the pusher thickness from the average should be less than microns to keep a high target gain.