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|
Show full item record
Page view(s) 20127
This item is available under the Attribution-NonCommercial-NoDerivs 3.0 Ireland. No item may be reproduced for commercial purposes. For other possible restrictions on use please refer to the publisher's URL where this is made available, or to notes contained in the item itself. Other terms may apply.