Uniformity simulation of multiple-beam irradiation of a spherical laser target with the inclusion of radiation absorption and refraction

We consider the physicomathematical model for the simulation of the angular laser flux distribution in a spherical target with the inclusion of radiation refraction in the corona. The irradiation uniformity is simulated using the target irradiation scheme on a megajoule multiple-beam laser facility....

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Bibliographic Details
Published in:Quantum electronics (Woodbury, N.Y.) N.Y.), 2019-02, Vol.49 (2), p.124-132
Main Authors: Demchenko, N.N., Gus'kov, S.Yu, Zmitrenko, N.V., Rozanov, V.B., Stepanov, R.V.
Format: Article
Language:English
Subjects:
absorption and refraction of radiation
ANGULAR DISTRIBUTION
angular distribution of absorbed flux
Axes (reference lines)
beam energy spread
beam pointing errors
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Computer simulation
COMPUTERIZED SIMULATION
Flux
GEOMETRY
IRRADIATION
Laser beams
LASER RADIATION
LASER TARGETS
LASERS
Nonuniformity
PLASMA
PULSES
Radiation absorption
RANDOMNESS
REFRACTION
SPHERICAL CONFIGURATION
target displacement from beam pointing centre
target irradiation nonuniformity
TIME DEPENDENCE
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Summary:We consider the physicomathematical model for the simulation of the angular laser flux distribution in a spherical target with the inclusion of radiation refraction in the corona. The irradiation uniformity is simulated using the target irradiation scheme on a megajoule multiple-beam laser facility. Calculations are made of the time-dependent angular distribution of absorbed flux and of the angular distribution of the time-integrated characteristic - the absorbed energy with allowance for the temporal shape of laser pulses - as well as of the time dependence of absorption efficiency. Different versions of target irradiation are considered. Under conventional irradiation it is assumed that the axes of all laser beams of equal energy pass through the target centre and the irradiation nonuniformity is due to its geometry only. Also examined are three unconventional irradiation versions: when there is a small spread of beam energies, when the target is displaced from the common beam pointing centre, and when the beam axes have small random deviations from the target centre. It is shown that the nonuniformity of the angular distribution of absorbed flux is greatest when the target is displaced from the beam pointing centre.
ISSN:1063-7818
1468-4799
DOI:10.1070/QEL16784