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

Demchenko, N. N.; Gus’kov, S. Yu.; Змитренко, Н. В.; Rozanov, V. B.; Stepanov, R. V.

doi:10.1070/qel16784

Cited by 4 publications

(6 citation statements)

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“…The surface M = 1 is located in the subcritical plasma. It was shown in [11] that with multi-beam irradiation of a spherical target, the angular averaged laser energy deposition has a maximum at a plasma density lower than the critical density. This is due to the refraction of radiation.…”

Section: Cbet Scattering Modelmentioning

confidence: 99%

“…If we consider the scattering fraction determined from equation (11), then it does not depend on the manner of perturbations dissipation. The integral I (9) does not include µ.…”

Section: Cbet Scattering Modelmentioning

confidence: 99%

“…Consider the value R R , determined from (11), as a function of q 0R and R L : R R = R R (q 0R ,R L ). We show that R R increases with increasing q 0R or R L .…”

Section: Cbet Scattering Modelmentioning

confidence: 99%

“…We show that R R increases with increasing q 0R or R L . The logarithm of the left and right parts (11) gives:…”

Section: Cbet Scattering Modelmentioning

confidence: 99%

“…At the point M = 1, the dependences ∆Q 0 , ∆Q 1 and R have jumps that take into account stimulated scattering. Relations (11) and ( 13) are used to connect the values to the left and right of the jump. In (13), instead of q 0L and q 0R , ∆Q 0L and ∆Q 0R are used, respectively.…”

Section: Cbet Scattering Modelmentioning

confidence: 99%

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The crossed-beam energy transfer model without empirical factor for multi-beam irradiation of a spherical laser target

Demchenko¹

2022

Plasma Phys. Control. Fusion

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Stimulated Brillouin scattering of laser radiation in an expanding plasma during compression of a spherical target can significantly reduce the fraction of absorbed energy. A model of CBET (crossed-beam energy transfer) stimulated scattering under multi-beam irradiation of a spherical target has been developed. The model does not contain empirical factor, unlike the model known in the literature. This makes it possible to use it in calculations for the conditions of planned experiments. Calculations of the fraction CB of energy released from the plasma due to CBET scattering for experimental conditions at the OMEGA installation have been carried out. It is shown that this fraction depends on the factor fe of the electron heat flux limitation. With fe values in the range 0.04-0.06, the calculated values of CB (0.12-0.084) are close to the value 0.1 obtained in the experiment and in numerical simulation at fe=0.06.

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Section: Cbet Scattering Modelmentioning

confidence: 99%

“…If we consider the scattering fraction determined from equation (11), then it does not depend on the manner of perturbations dissipation. The integral I (9) does not include µ.…”

Section: Cbet Scattering Modelmentioning

confidence: 99%

“…Consider the value R R , determined from (11), as a function of q 0R and R L : R R = R R (q 0R ,R L ). We show that R R increases with increasing q 0R or R L .…”

Section: Cbet Scattering Modelmentioning

confidence: 99%

“…We show that R R increases with increasing q 0R or R L . The logarithm of the left and right parts (11) gives:…”

Section: Cbet Scattering Modelmentioning

confidence: 99%

Section: Cbet Scattering Modelmentioning

confidence: 99%

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The crossed-beam energy transfer model without empirical factor for multi-beam irradiation of a spherical laser target

Demchenko¹

2022

Plasma Phys. Control. Fusion

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Partition of Omega-like facility into two configurations of 24 and 36 laser beams to improve implosion performance

Temporal

Piriz

Canaud

et al. 2023

Sci Rep

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An Omega-like beam configuration is considered where the 60-beam layout can be separated into two independent sub-configurations with 24 and 36 laser beams, each minimizing direct drive illumination non-uniformity. Two different laser focal spot profiles, one associated with each configuration, are proposed to apply the zooming technique in order to increase the laser-target coupling efficiency. This approach is used by 1D hydrodynamics simulations of the implosion of a direct-drive capsule characterized by a relatively large aspect ratio A = 7 and an optimized laser pulse shape delivering a maximum of 30 TW and 30 kJ, with different temporal pulse shapes in each of the two sets of beams. It is shown that zooming allows for an optimistic 1D thermonuclear energy gain greater than one while without zooming the thermonuclear gain remains largely below one. While this is incompatible with the as-built Omega laser, it provides a promising option for a future intermediate-energy direct drive laser system.

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Estimation of the neutron generation in the combined magneto-inertial fusion scheme

Kuzenov

Ryzhkov

2021

Phys. Scr.

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The results of calculating the combined effects of intense laer beams and plasma jets on a cylindrical target located in external magnetic field are presented. Parameters of compressed plasma are demonstrated and the capability to create neutron source with combined scheme-the number of neutrons per unit length N fus ≈ 10 15 n•cm −1 by the time the exposure is completed, is shown. The conclusion is drawn about the prospects of the combined use of laser radiation and pulsed jets in interaction with a magnetized target. RECEIVED

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

Cited by 4 publications

References 0 publications

The crossed-beam energy transfer model without empirical factor for multi-beam irradiation of a spherical laser target

The crossed-beam energy transfer model without empirical factor for multi-beam irradiation of a spherical laser target

Partition of Omega-like facility into two configurations of 24 and 36 laser beams to improve implosion performance

Estimation of the neutron generation in the combined magneto-inertial fusion scheme

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