Simultaneous experimental measurements of copper Kα imaging and the maximum target normal sheath acceleration proton energies from the rear target surface are compared for various target thicknesses. For the T-cubed laser (≈4 J, 400 fs) at an intensity of ≈2 × 1019 W cm−2, the hot electron divergence is determined to be using a Kα imaging diagnostic. The maximum proton energies are measured to follow the expected reduction with increasing target thickness. Numerical modeling produces copper Kα trends for both signal level and electron beam divergence that are in good agreement with the experiment. A geometric model describing the electron beam divergence reproduces the maximum proton energy trends observed from the experiment and the fast electron density and the peak electric field observed in the numerical modeling.
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December 2013
Research Article|
December 23 2013
Investigation of relativistic intensity laser generated hot electron dynamics via copper Kα imaging and proton acceleration
L. Willingale;
L. Willingale
1
Center for Ultrafast Optical Science, University of Michigan
, 2200 Bonisteel Boulevard, Ann Arbor, Michigan 48109, USA
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A. G. R. Thomas;
A. G. R. Thomas
1
Center for Ultrafast Optical Science, University of Michigan
, 2200 Bonisteel Boulevard, Ann Arbor, Michigan 48109, USA
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A Maksimchuk;
A Maksimchuk
1
Center for Ultrafast Optical Science, University of Michigan
, 2200 Bonisteel Boulevard, Ann Arbor, Michigan 48109, USA
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A. Morace;
A. Morace
a)
2
University of California-San Diego
, La Jolla, California 92093, USA
3
Università di Milano-Biocca
, Piazza della Scienza 3, 20126 Milano, Italy
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T. Bartal;
T. Bartal
2
University of California-San Diego
, La Jolla, California 92093, USA
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J. Kim;
J. Kim
2
University of California-San Diego
, La Jolla, California 92093, USA
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R. B. Stephens;
R. B. Stephens
4
General Atomics
, San Diego, California 92121, USA
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M. S. Wei;
M. S. Wei
4
General Atomics
, San Diego, California 92121, USA
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F. N. Beg;
F. N. Beg
2
University of California-San Diego
, La Jolla, California 92093, USA
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K. Krushelnick
K. Krushelnick
1
Center for Ultrafast Optical Science, University of Michigan
, 2200 Bonisteel Boulevard, Ann Arbor, Michigan 48109, USA
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a)
Present address: Institute of Laser Engineering, Osaka University, Japan.
Phys. Plasmas 20, 123112 (2013)
Article history
Received:
October 28 2013
Accepted:
December 09 2013
Citation
L. Willingale, A. G. R. Thomas, A Maksimchuk, A. Morace, T. Bartal, J. Kim, R. B. Stephens, M. S. Wei, F. N. Beg, K. Krushelnick; Investigation of relativistic intensity laser generated hot electron dynamics via copper Kα imaging and proton acceleration. Phys. Plasmas 1 December 2013; 20 (12): 123112. https://doi.org/10.1063/1.4853575
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