Electron and ion stagnation at the collision front between two laser produced plasmas
|Title:||Electron and ion stagnation at the collision front between two laser produced plasmas||Authors:||Hough, Pádraig
Kelly, Thomas J.
Harilal, Sivanandan S.
Costello, John T.
|Permanent link:||http://hdl.handle.net/10197/3557||Date:||7-Mar-2009||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 the electron density at the collision front. Analysis of the resulting interferograms reveals the formation and evolution of a localised electron density feature with a well defined profile reminiscent of a stagnation layer. First signs of electron stagnation are observed at a time delay of 10 ns after the peak of the plasma generating laser pulse. The peak electron density was found to exceed 1019 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.||Funding Details:||Science Foundation Ireland
Higher Education Authority
Irish Research Council for Science, Engineering and Technology
|Type of material:||Journal Article||Publisher:||Institute of Physics||Copyright (published version):||2009 IOP Publishing||Keywords:||Plasmas;Lasers;Electron density profile;Ion distribution;Stagnation layer;Colliding plasmas||Subject LCSH:||Laser plasmas
|DOI:||10.1088/0022-3727/42/5/055211||Language:||en||Status of Item:||Peer reviewed|
|Appears in Collections:||Physics Research Collection|
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