Influence of Fast Ion Losses in Inertially Confined Nuclear Fusion Plasma
The gain G of the thermonuclear fusion energy of very dense spherical plasmas heated by lasers in times of about 1 nsec is treated theoretically. Assuming as a pessimistic estimate that fast ions leave the plasma without contributing to fusion neutrons, we find that for G = 1 laser energies of 3 × 107 joules are needed. A kinetic theory for a one species gas starting with a Gaussian density and velocity profile yields almost the same result as found by a hydrodynamic model with adiabatic expansion and without fast ion losses taken into account. In the latter case the even-point of G = 1 is reached at the well-known value for the laser energy of 4.6 × 106 joules for a D-T reaction.
KeywordsLaser Energy Fusion Reaction Fusion Cross Section Laser Interaction Thermonuclear Fusion
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