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Charge resolved electrostatic diagnostic of colliding copper laser plasma plumes
Date Issued
2011
Date Available
2012-05-15T16:03:53Z
Abstract
The collision of two laser generated plasma plumes can result, under appropriate conditions, in the formation of ‘stagnation layer’. The processes underlying this phenomenon are complex and time dependent. The majority of experiments over the last few decades have focused upon spectroscopic diagnostic of colliding plasmas. We have performed electrostatic diagnosis of multiply charged copper ions (Cu+ to Cu5+) generated via Q-switched pulsed laser (λ=1.06 μm, τ=6 ns, EL=52-525 mJ) generation of copper plasma plumes from a planar target. Time dependent current traces, charge yields and kinetic energy (Ke) distributions are obtained for single plasma plumes (Sp) and colliding plasma plumes (Cp). The charge yield from a Cp relative to twice that from a Sp is characterized by a charge yield ratio (CYR) parameter. Superior ion yields for all charge states occur for a discrete range of fluences (F) from colliding plasma plumes leading to a CYR parameter exceeding unity. The kinetic energy distributions from colliding plasma plumes display well defined energy compression via narrowing of the distributions for all fluences and charge states. The extent of this energy compression is charge dependent. Space charge forces within the stagnation layer and the resulting charge dependent acceleration of ions is proposed to account for the transfer of ion kinetic energy in favour of collisional ionization mechanisms.
Sponsorship
Higher Education Authority
Science Foundation Ireland
Other Sponsorship
Enterprise Ireland
Type of Material
Journal Article
Publisher
American Institute of Physics
Journal
Physics of Plasmas
Volume
18
Issue
10
Start Page
103104-1
End Page
103114-10
Copyright (Published Version)
2011 American Institute of Physics
Subject – LCSH
Laser plasmas
Electrostatics
Linear accelerators
Language
English
Status of Item
Peer reviewed
ISSN
1070-664X
This item is made available under a Creative Commons License
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