Comparison of direct and indirect positron-generation by an ultra-intense femtosecond laser
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000 (China)
- Science and Technology on Plasma Physics Laboratory, Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900 (China)
An extensive comparison of the properties of positron beams produced by an ultra-intense femtosecond laser in direct and indirect schemes has been performed with two-dimensional particle-in-cell and Monte Carlo simulations. It is shown that the positron beam generated in the indirect scheme has a higher yield (10{sup 10}), a higher temperature (28.8 MeV), a shorter pulse duration (5 ps), and a smaller divergence (8°) than in the direct case (10{sup 9} yield, 4.4 MeV temperature, 40 ps pulse duration, and 60° divergence). In addition, it was found that the positron/gamma ratio in the indirect scheme is one order of magnitude higher than that in the direct one, which represents a higher signal/noise ratio in positron detection. Nevertheless, the direct generation method still has its own unique advantage, the so-called target normal sheath acceleration, which can result in quasi-monoenergetic positron beams that may serve in some specialized applications.
- OSTI ID:
- 22218559
- Journal Information:
- Physics of Plasmas, Vol. 20, Issue 10; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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07 ISOTOPES AND RADIATION SOURCES
ACCELERATION
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COMPUTERIZED SIMULATION
LASER-PRODUCED PLASMA
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MEV RANGE
MONTE CARLO METHOD
PLASMA SIMULATION
POSITRON BEAMS
POSITRON DETECTION
POSITRONS
SIGNAL-TO-NOISE RATIO
TWO-DIMENSIONAL CALCULATIONS