放電誘導に有効なレーザ電離チャネルの生成とその長尺化

抄録

A long air-breakdown channel was made using a TEA. CO2 laser with an output energy of 0.5kJ in order to induce a long-gap impulse discharge. The maximum length of a plasma channel made was 18m by combined concave mirrors with a focal length of 34.3m. We have developed a new method which can measure the most effective part of the plasma channel in inducing a long-gap discharge. By using this method, it is possible to make the longest of the laser-induced sparkover for a given discharge condition. We demonstrated that the longest laser-induced sparkover length of 10m was achieved for an impulse voltage of 1.05MV.