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Electron and ion stagnation at the collision front between two laser produced plasmas

Hough, Pádraig and McLoughlin, Conor and Kelly, Thomas J. and Hayden, Patrick and Harilal, Sivanandan S. and Mosnier, Jean-Paul and Costello, John T. (2009) Electron and ion stagnation at the collision front between two laser produced plasmas. Journal of Physics D: Applied Physics, 42 (5). ISSN 1361-6463

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Abstract

We report results from a combined optical interferometric and spectrally resolved imaging study on colliding laser produced aluminium plasmas. A Nomarski interferometer was used to probe the spatio-temporal distribution of electron densities at the collision front. Analysis of the resulting interferograms reveals the formation and evolution of a localized electron density feature with a well-defined profile reminiscent of a stagnation layer. Electron stagnation begins at a time delay of 10 ns after the peak of the plasma generating laser pulse. The peak electron density was found to exceed 10^19 cm^−3 and the layer remained well defined up to a time delay of ca 100 ns. Temporally and spectrally resolved optical imaging was also undertaken, to compare the Al^+ ion distribution with that of the 2D electron density profile. This revealed nascent stagnation of singly charged ions at a delay time of 20 ns. We attribute these results to the effects of space charge separation in the seed plasma plumes.

Item Type:Article (Published)
Refereed:Yes
Uncontrolled Keywords:lasers; plasmas; stagnation layer; colliding plasmas; electron density profile; ion distribution;
Subjects:Physical Sciences > Laser plasmas
Physical Sciences > Physics
Physical Sciences > Lasers
DCU Faculties and Centres:Research Initiatives and Centres > National Centre for Plasma Science and Technology (NCPST)
DCU Faculties and Schools > Faculty of Science and Health > School of Physical Sciences
Publisher:Institute of Physics
Official URL:http://dx.doi.org/10.1088/0022-3727/42/5/055211
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
Funders:Science Foundation Ireland, Irish Research Council for Science Engineering and Technology, DCU International Visiting Fellows Programme
ID Code:15134
Deposited On:03 Feb 2010 14:51 by Padraig Hough. Last Modified 29 Aug 2013 14:22

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