Ablation effect on an impulse discharge induced by a laser-plasma channel

Michihiro Uchiumi; Kiyotaka Ueda; Katsunori Muraoka; Fumihiro Kinoshita; Masanori Akazaki; Toshikatsu Tanaka; Chikahisa Honda

doi:10.1117/12.375107

11 January 2000 Ablation effect on an impulse discharge induced by a laser-plasma channel

Michihiro Uchiumi, Kiyotaka Ueda, Katsunori Muraoka, Fumihiro Kinoshita, Masanori Akazaki, Toshikatsu Tanaka, Chikahisa Honda

Author Affiliations +

Proceedings Volume 3886, High-Power Lasers in Energy Engineering; (2000) https://doi.org/10.1117/12.375107
Event: Advanced High-Power Lasers and Applications, 1999, Osaka, Japan

Abstract

In order to develop a technique to induce a negative impulse discharge by a laser-ionized channel in a rod-to-rod electrode configuration, the ablation effect on the induction has been examined. Single irradiation by a high- power CO₂ laser on the surface of the copper high- voltage electrode produced a luminous plasma plume. This ablation plasma was used for a discharge induction by an ionization channel created by a XeCl laser. It was found that the ablation enhances the trigger and guide effect for induction of a long gap discharge. The guide length was elongated approximately twice. The ablation plasma bead reduced the 50 percent sparkover voltage and the sparkover time. Electrical discharge leaders were observed by a flaming image converter camera. The ablation plasma bead made an early start of the leader from the high-voltage electrode and accelerated the leader advancement.

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Michihiro Uchiumi, Kiyotaka Ueda, Katsunori Muraoka, Fumihiro Kinoshita, Masanori Akazaki, Toshikatsu Tanaka, and Chikahisa Honda "Ablation effect on an impulse discharge induced by a laser-plasma channel", Proc. SPIE 3886, High-Power Lasers in Energy Engineering, (11 January 2000); https://doi.org/10.1117/12.375107

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