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Repetitive outbursts of fast carbon and fluorine ions from sub-nanosecond laser-produced plasma

Published online by Cambridge University Press:  23 January 2009

J. Krása ,
A. Velyhan ,
K. Jungwirth ,
E. Krouský ,
L. Láska ,
K. Rohlena ,
M. Pfeifer  and
J. Ullschmied
J. Krása*
Affiliation:
Institute of Physics A.S.C.R., v.v.i., Prague, Czech Republic
A. Velyhan
Affiliation:
Institute of Physics A.S.C.R., v.v.i., Prague, Czech Republic
K. Jungwirth
Affiliation:
Institute of Physics A.S.C.R., v.v.i., Prague, Czech Republic
E. Krouský
Affiliation:
Institute of Physics A.S.C.R., v.v.i., Prague, Czech Republic
L. Láska
Affiliation:
Institute of Physics A.S.C.R., v.v.i., Prague, Czech Republic
K. Rohlena
Affiliation:
Institute of Physics A.S.C.R., v.v.i., Prague, Czech Republic
M. Pfeifer
Affiliation:
Institute of Physics A.S.C.R., v.v.i., Prague, Czech Republic
J. Ullschmied
Affiliation:
Institute of Plasma Physics A.S.C.R., v.v.i., Prague, Czech Republic
*
Address correspondence and reprint requests to: J. Krása, Institute of Physics A.S.C.R., v.v.i., Na Slovance 2, 182 21 Prague 8, Czech Republic. E-mail: [email protected]
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Abstract

Repeated plasma outbursts were recognized at our analyzing currents of the fast carbon and fluorine ions produced with the sub-nanosecond PALS laser beam (λ0 = 1.315 µm, τL = ≈350 ps, Imax ≈ 6 × 1015 W/cm2) focused onto polytetrafluoroethylene and polyethylene targets. This study deals with a repetitive occurrence of doublets of C6+-C5+ and F9+-F8+ ion peaks in the time-of-flight (TOF) spectra, whose TOF can be related to the same accelerating voltage: . The repeated occurrence of ion outbursts containing fully ionized ions can be characterized by a set of discrete voltages Ui, where the subscript i ∈ (1, N) labels the outbursts of ions from the fastest one (i = 1) up to the slowest and in the TOF spectrum yet distinguishable outburst (i = N). These discrete values could indicate plasma pulsations followed by repetitive outbursts of ions. The ions expand with a velocity up to ≈9 × 108 cm/s. The corresponding values of the accelerating voltage of ≈800 kv, and the temperature of ≈1.1 keV were determined by revealing partial ion currents based on the shifted Maxwell-Boltzmann velocity distribution. Characteristics of fast ion outbursts depend on the focus position with respect to the target surface.

Keywords

Laser-produced plasmaOutbursts of fast ions
Type
Research Article
Information
Laser and Particle Beams , Volume 27 , Issue 1 , March 2009 , pp. 171 - 178
Copyright
Copyright © Cambridge University Press 2009

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