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This paper describes the experiment of plasma formation and heating in the open air by superpotion of microwave and XeCl excimer laser beam as a fundamental study for Laser Triggering of Lightning. This experiment shows that a plasma can be formed by superposition of XeCl laser beam and microwave, and that continuous microwave can heat a laser plasma and can make it steady-state and big. By superposing microwave on XeCl laser, the threshold value of XeCl laser energy for plasma formation is reduced to 20%. On the other hand, by superposing XeCl laser beam on microwave, the required power of microwave for plasma formation is reduced to 8%. Thus, superposition of XeCl laser and microwave will work effective for plasma formation and for triggering of lightning.

Steady-state Plasma Formation and Heating in the Open Air by Superposition of Microwave and XeCl Laser