Plasma and Fusion Research
Volume 12, 1201014 (2017)
Rapid Communications
- 1)
- Department of Energy Sciences, Tokyo Institute of Technology, Midori-Ku, Yokohama 226-8502, Japan
- 2)
- Research Laboratory, IHI Corporation, Isogo-Ku, Yokohama 235-8501, Japan
Abstract
Charge flows were induced from a laser ablation plasma to a grounded target. The current signals, which were directly measured using a current monitor, developed from negative to positive depending on the dynamically evolving plasma. The results showed that, initially the current was induced by an electron flow from the plasma plume to the surrounding wall and, after a transient phase, the current was replaced by an ion flow to the wall. The results suggest that there was a breaking of the quasi-neutral state of the ablation plasma and that an ambipolar electric field (double layer; DL) was generated during the ablation process.
Keywords
laser ablation, double layer, sheath, two-electron temperature, ion acceleration
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