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This study was carried out to examine the possibility of lightning control using a photoionized plasma produced by a UV laser without an optical air breakdown. As its fundamental experiment, the characteristics of a laser-triggered spark gap (LTSG) were examined, where a laser beam was not irradiated on the surface of the electrodes. In this experiment, the KrF excimer laser was much effective for increasing the plasma density ne and the reduction ratio p of 50% breakdown voltage against the self-breakdown voltage. The relation between ne and p was explained by the streamer theory, and the reduction ratio p was increased by generating a long and high density plasma parallel to the discharge axis. On the other hand, the abnormal discharge process in triggered lightning using a rocket was examined, and it was indicated that the most important condition to trigger a lightning discharge was the production of a plasma channel whose length was 200 m and density was about 1019 m-1. It was suggested that such a plasma channel could be produced by a KrF excimer laser with an energy of only about 3.67 J.

Fundamental Research for Lightning Trigger Experiment by Using UV Lasers