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Observation of amplification of light by Langmuir waves and its saturation on the electron kinetic timescale

Published online by Cambridge University Press:  21 December 2010

R. K. KIRKWOOD ,
Y. PING ,
S. C. WILKS ,
N. MEEZAN ,
P. MICHEL ,
E. WILLIAMS ,
D. CLARK ,
L. SUTER ,
O. LANDEN  and
N. J. FISCH
...Show all authors
R. K. KIRKWOOD
Affiliation:
Lawrence Livermore National Laboratory, Livermore, California 94550, USA
Y. PING
Affiliation:
Lawrence Livermore National Laboratory, Livermore, California 94550, USA
S. C. WILKS
Affiliation:
Lawrence Livermore National Laboratory, Livermore, California 94550, USA
N. MEEZAN
Affiliation:
Lawrence Livermore National Laboratory, Livermore, California 94550, USA
P. MICHEL
Affiliation:
Lawrence Livermore National Laboratory, Livermore, California 94550, USA
E. WILLIAMS
Affiliation:
Lawrence Livermore National Laboratory, Livermore, California 94550, USA
D. CLARK
Affiliation:
Lawrence Livermore National Laboratory, Livermore, California 94550, USA
L. SUTER
Affiliation:
Lawrence Livermore National Laboratory, Livermore, California 94550, USA
O. LANDEN
Affiliation:
Lawrence Livermore National Laboratory, Livermore, California 94550, USA
N. J. FISCH
Affiliation:
Department of Astrophysical Sciences, Princeton University, Princeton, New Jersey 08544, USA
E. J. VALEO
Affiliation:
Department of Astrophysical Sciences, Princeton University, Princeton, New Jersey 08544, USA
V. MALKIN
Affiliation:
Department of Astrophysical Sciences, Princeton University, Princeton, New Jersey 08544, USA
D. TURNBULL
Affiliation:
Department of Astrophysical Sciences, Princeton University, Princeton, New Jersey 08544, USA
S. SUCKEWER
Affiliation:
Department of Astrophysical Sciences, Princeton University, Princeton, New Jersey 08544, USA
J. WURTELE
Affiliation:
Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA
T. L. WANG
Affiliation:
Department of Electrical Engineering, University of California at Los Angeles, Los Angeles, California 90095, USA
S. F. MARTINS
Affiliation:
Department of Electrical Engineering, University of California at Los Angeles, Los Angeles, California 90095, USA
C. JOSHI
Affiliation:
Department of Electrical Engineering, University of California at Los Angeles, Los Angeles, California 90095, USA
L. YIN
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
B. J. ALBRIGHT
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
H. A. ROSE
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
K. J. BOWERS
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
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Abstract

Experiments demonstrate the ~77× amplification of 0.5 to 3.5-ps pulses of seed light by interaction with Langmuir waves in a low density (1.2 × 1019 cm−3) plasma produced by a 1-ns, 230-J, 1054-nm pump beam with 1.2 × 1014 W/cm2 intensity. The waves are strongly damped (kλD = 0.38, Te = 244 eV) and grow over a ~ 1 mm length, similar to what is experienced by scattered light when it interacts with crossing beams as it exits an ignition target. The amplification reduces when the seed intensity increases above ~1 × 1011 W/cm2, indicating that saturation of the plasma waves on the electron kinetic time scale (<0.5 ps) limits the scatter to ~1% of the available pump energy. The observations are in agreement with 2D PIC simulations in this case.

Type
Papers
Information
Journal of Plasma Physics , Volume 77 , Issue 4 , August 2011 , pp. 521 - 528
Copyright
Copyright © Cambridge University Press 2010

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