We measured, using Petawatt-level pulses, the average ion energy and neutron yield in high-intensity laser interactions with molecular clusters as a function of laser intensity. The interaction volume over which fusion occurred (1–10 mm3) was larger than previous investigations, owing to the high laser power. Possible effects of prepulses were examined by implementing a pair of plasma mirrors. Our results show an optimum laser intensity for the production of energetic deuterium ions both with and without the use of the plasma mirrors. We measured deuterium plasmas with 14 keV average ion energies, which produced 7.2 × 106 and 1.6 × 107 neutrons in a single shot with and without plasma mirrors, respectively. The measured neutron yields qualitatively matched the expected yields calculated using a cylindrical plasma model.
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September 2013
Research Article|
September 17 2013
Optimum laser intensity for the production of energetic deuterium ions from laser-cluster interaction
W. Bang;
W. Bang
a)
Department of Physics, Center for High Energy Density Science, C1510, University of Texas at Austin
, Austin, Texas 78712, USA
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G. Dyer;
G. Dyer
Department of Physics, Center for High Energy Density Science, C1510, University of Texas at Austin
, Austin, Texas 78712, USA
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H. J. Quevedo;
H. J. Quevedo
Department of Physics, Center for High Energy Density Science, C1510, University of Texas at Austin
, Austin, Texas 78712, USA
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A. C. Bernstein;
A. C. Bernstein
Department of Physics, Center for High Energy Density Science, C1510, University of Texas at Austin
, Austin, Texas 78712, USA
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E. Gaul;
E. Gaul
Department of Physics, Center for High Energy Density Science, C1510, University of Texas at Austin
, Austin, Texas 78712, USA
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J. Rougk;
J. Rougk
Department of Physics, Center for High Energy Density Science, C1510, University of Texas at Austin
, Austin, Texas 78712, USA
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F. Aymond;
F. Aymond
Department of Physics, Center for High Energy Density Science, C1510, University of Texas at Austin
, Austin, Texas 78712, USA
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M. E. Donovan;
M. E. Donovan
Department of Physics, Center for High Energy Density Science, C1510, University of Texas at Austin
, Austin, Texas 78712, USA
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T. Ditmire
T. Ditmire
Department of Physics, Center for High Energy Density Science, C1510, University of Texas at Austin
, Austin, Texas 78712, USA
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a)
Author to whom correspondence should be addressed. Electronic mail: [email protected].
Phys. Plasmas 20, 093104 (2013)
Article history
Received:
June 10 2013
Accepted:
August 26 2013
Citation
W. Bang, G. Dyer, H. J. Quevedo, A. C. Bernstein, E. Gaul, J. Rougk, F. Aymond, M. E. Donovan, T. Ditmire; Optimum laser intensity for the production of energetic deuterium ions from laser-cluster interaction. Phys. Plasmas 1 September 2013; 20 (9): 093104. https://doi.org/10.1063/1.4821611
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