Charge resolved electrostatic diagnostic of colliding copper laser plasma plumes

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Title: Charge resolved electrostatic diagnostic of colliding copper laser plasma plumes
Authors: Yeates, P
Fallon, Conor
Kennedy, E.T.
Costello, John T.
Permanent link: http://hdl.handle.net/10197/3614
Date: 2011
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.
Funding Details: Science Foundation Ireland
Higher Education Authority
Other funder
Type of material: Journal Article
Publisher: American Institute of Physics
Copyright (published version): 2011 American Institute of Physics
Keywords: Copper colliding plasmaDiagnosticFaraday cupGridded retarding field analyzerCharge resolvedCharge yieldEnergy compression
Subject LCSH: Laser plasmas
Electrostatics
Linear accelerators
DOI: 10.1063/1.3633486
Language: en
Status of Item: Peer reviewed
Appears in Collections:Physics Research Collection

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