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Transient Charge Flows Induced by the Evolution of Laser Ablation Plasma

Shotaro KITTAKA¹⁾, Tatsuya SODEKODA^1,2), Jun HASEGAWA¹⁾ and Kazuhiko HORIOKA¹⁾

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

(Received 24 January 2017 / Accepted 6 February 2017 / Published 17 April 2017)

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.

Copyright (c) 2017 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

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

DOI: 10.1585/pfr.12.1201014

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