Thermonuclear Fusion Plasma Produced by Lasers

概要

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Recently much attention has focused on the laser fusion scheme using high density plasma produced by the implosion. The scientific feasibility experiment on laser fusion has come on a time schedule. But physics of the interaction between laser and plasma, the technique of the high compression and the development of high power lasers are still important problems to be studied for the progress of laser fusion. As for the coupling of laser light and plasma, we have performed the laser bombarding experiments on the hydrogen and deuterium stick targets using a glass laser system "LETKO-I", energy 50 J in nanosecond pulse, and a double discharge TEA CO_2 laser system, energy 100 J in 100 nanoseconds pulse. The decrease of the reftectivity has appeared at the laser intensity of one order larger than the threshold of the prametric instability. The phase modulation of the scattered light due to modulational instability was found. An isotope effect of Brillouin backscattering from the hydrogen and deuterium plasma has also been observed in the red side part of the SHG light. Preliminary compression experiment has been tested using a glass laser system "LETKO-II", energy 250-1000 J in nsec pulse. The hologram has been used to check the shock wave in plasma by the SHG light converted from the main laser beam. The development of high power lasers has been promoted such as disc glass lasers, E-beam CO_2 lasers and excimer lasers.
核融合科学研究所の論文