Laser plasma generation and plasma interaction with ablative
target
-
Published:2007-02-28
Issue:1
Volume:25
Page:53-63
-
ISSN:0263-0346
-
Container-title:Laser and Particle Beams
-
language:en
-
Short-container-title:Laser Part. Beams
Abstract
The model of plasma production by laser radiation onto a solid target
was developed taking into account plasma heating by the emitted electrons
and target heating by ion bombardment, as well as by the laser radiation.
The near target plasma structure was analyzed. The space charge sheath was
studied solving the Poisson equation and taking into account the volume
charge of accelerated electrons and ions. The kinetics of atoms evaporated
from the target and the back-flow of atoms and ions from the plasma
towards the surface was analyzed. A system of equations, including
equations for solid heat conduction, plasma generation and the plasma
expansion was formulated. The calculation for Cu target, laser spot radius
100 μm, pulse duration 1 ms, 103, 10, 1ns and laser power
density qL = 10−3–1
GW/cm2 was conducted. The ratio of net evaporation rate to
the total evaporated mass flux was determined. It was shown that the
plasma mainly generated in the electron emission beam relaxation region
and there the plasma flow is subsonic. The electric field at the target
surface is relatively large and therefore the ion current to the surface
in the space region is large and comparable with the electron emission
current. A large contribution of the plasma energy flux in the target heat
regime was obtained, showing that the laser generated plasma significantly
converts the absorbed laser energy to kinetic and potential energy of the
plasma particles, which transport part of the energy through the
electrostatic sheath to the solid surface.
Publisher
Hindawi Limited
Subject
Electrical and Electronic Engineering,Condensed Matter Physics,Atomic and Molecular Physics, and Optics
Reference29 articles.
1. Chen, Z. & Bogaerts, A. (2005).Laser ablation of Cu and plume expansion into 1 atm ambientgas.J. Appl. Phys. 97,063305-1–063305-12. 2. Fisher, D. , Fraenkel, M. , Zinamon, Z. , Henis, Z. , Moshe, E. , Horovitz, Y. , Luzon, E. , Maman, S. & Eliezer, S. (2005).Intraband and interband absorption of femtosecond laser pulses incopper.Laser Part. Beams 23,391–393. 3. Fernandez, J.C. , Hegelich, B.M. , Cobble, J.A. , Flippo, K.A. , Letzring, S.A. , Johnson, R.P. , Gautier, D.C. , Shimada, T. , Kyrala, G.A. , Wang, Y.Q. , Wetteland, C.J. & Schreiber, J. (2005).Laser-ablation treatment of short-pulse laser targets: Toward anexperimental program on energetic-ion interactions with denseplasmas.Laser Part. Beams 23,267–273. 4. Beilis, I.I. (2006).Mechanism of laser plasma production and of plasma interaction witha target.Appl. Phys. Lett. 89,091503. 5. Hoffmann, D.H.H. , Blazevic, A.P. , Rosmej, N.O. , Roth, M. , Tahir, N.A. , Tauschwitz, A. , Udrea, S. , Varentsov, D. , Weyrich, K. & Maron, Y. (2005).Present and future prospectives for high energy density physics withintense heavy ion and laser beams.Laser Part. Beams 23,47–53.
Cited by
45 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
|
|