Plasma and Fusion Research

Volume 12, 1201014 (2017)

Rapid Communications

Transient Charge Flows Induced by the Evolution of Laser Ablation Plasma
Shotaro KITTAKA1), Tatsuya SODEKODA1,2), Jun HASEGAWA1) and Kazuhiko HORIOKA1)
Department of Energy Sciences, Tokyo Institute of Technology, Midori-Ku, Yokohama 226-8502, Japan
Research Laboratory, IHI Corporation, Isogo-Ku, Yokohama 235-8501, Japan
(Received 24 January 2017 / Accepted 6 February 2017 / Published 17 April 2017)


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.


laser ablation, double layer, sheath, two-electron temperature, ion acceleration

DOI: 10.1585/pfr.12.1201014


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