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Structured fusion target designs

Structured targets for laser and electron beam fusion have recently been suggested in the open literature [1, 2], but the merits of such target designs have been studied for several years at Los Alamos Scientific Laboratory and Lawrence Livermore Laboratory and more recently at Sandia Laboratories [3]. The work presented here is a comparative study made at LASL during the past few months of structured fusion target designs, with specific emphasis on energy input from an electron beam machine. However, the results are not limited to e-beam targets. Present efforts to ignite a DT mass by direct electrical or laser energy deposition are limited by the energy available. Consequently, research has necessarily focused on systems containing very small DT masses, so that the input energy available will suffice to initiate thermonuclear burn. This process of 'miniaturization' leads to an additional problem — that of acceptance time, the time interval over which the target can accept energy and use it efficiently to drive the DT mass to ignition. Thus the problem of energy availability is compounded by power limitations. Presently available controllable sources of input energy are not capable of delivering the necessary energy in the acceptance time of the target.