Advanced Laser Technology for Laser-Induced Fusion Applications
At least five years of committed work have already been spent on the development of very large laser systems, target geometries, and diagnostic capabilities. We will draw upon many significant features of this work to identify trends for future facilities. Also, because laser facilities are likely to be very much larger in the future, some additional conclusions seem unavoidable. As a stimulus for these discussions let us consider how we might design a I-MJ laser facility today. This facility is large enough so as not to evoke many preconceived notions or biases, yet on the other hand, not too large to illustrate many of the problems we wish to point out. As an additional incentive for our review, let us recall, as demonstrated by many < 1 kJ target experiments (pulse duration 0.025 to 5 ns), that laser coupling inefficiencies as well as various undesirable energy-transport phenomena, for unsophisticated targets, dictate lasers with outputs of several hundred kilojoules to many megajoules to achieve significant net power generation (if not break-even) from laser-driven fusion. Current knowledge and laser research data clearly points to a number of weaknesses.
KeywordsStimulate Raman Scattering Atomic Iodine Emission Cross Section Energy Extraction Parametric Amplifier
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