Mitigation of deceleration-phase Rayleigh–Taylor instability growth in inertial confinement fusion implosions

Lawrence, Yousef; Goncharov, Valeri; Woo, Ka Ming; Trickey, William; Igumenshchev, Igor

doi:10.1063/5.0164835

Cited by 2 publications

(1 citation statement)

References 14 publications

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“…The thickness of this region grows during the deceleration phase leading to the mixing of the low-density hot spot and the surrounding cold and dense fuel. An option for reducing the deleterious effects of this mixing layer is to reduce the deceleration time t d and different strategies have been recently proposed to mitigate the RT growth of the mixing layer volume [32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Reduction of the deceleration phase to mitigate the negative effect of hydrodynamic instabilities in direct-drive ICF implosions

Temporal,

Piriz,

Canaud

et al. 2024

Phys. Scr.

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In the deceleration phase of an Inertial Confinement Fusion capsule implosion Rayleigh-Taylor hydrodynamic instability can affect or even quench the ignition and thermonuclear burn wave propagation. This instability tends to mix the inner hot plasma with the cold and dense plasma shell providing a mixing layer where nuclear fusion reactions are inhibited. The 1D hydrodynamic code Multi-IFE has been used to simulate the implosion of a direct-drive high-gain laser-capsule design and the temporal evolution of the average radius and thickness of the mixing layer have been estimated. To mimic the effect of the reduced reaction rate the fuel reactivity in the mixing layer has been artificially set to zero thus inhibiting the burn wave propagation throughout it nullifying the energy gain. In order to overcome this negative effect is proposed the addition of secondary short and powerful laser pulse that would reduce the duration of the deceleration phase, which in turn get smaller the thickness of the mixing layer. A study has been performed to identify the optimal secondary laser pulse that allows recover the high energy gain.

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Section: Introductionmentioning

confidence: 99%

Reduction of the deceleration phase to mitigate the negative effect of hydrodynamic instabilities in direct-drive ICF implosions

Temporal,

Piriz,

Canaud

et al. 2024

Phys. Scr.

View full text Add to dashboard Cite

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On the effect of initial internal roughness in ICF targets on their compression

Glazyrin,

Zakharov,

Gorodnichev

et al. 2024

Physics of Plasmas

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Achieving ignition in inertial confinement fusion requires significant heating and compression of the thermonuclear fuel. One of the most efficient ways to achieve such conditions is spherical compression of the target initiated by specially profiled laser pulses. Any irradiation asymmetries and target imperfections break the symmetry of the compression and are seeds for the growth of hydrodynamic instabilities. As a result, the initial small amplitudes grow significantly and break the effective target compression, which is critical for successful ignition. The paper numerically studies the evolution of ice–ablator small perturbations in a direct drive target. The simulations consider the target dynamics with two different numerical hydrocodes. As a result of Rayleigh–Taylor instability development during both acceleration and deceleration phases, the perturbations grow significantly and could violate the ignition if the initial amplitude is larger than the critical value of several hundred nm: for successful ignition, the amplitude should be compared or smaller than a 100 nm. The effect of perturbations propagating from the distributed interface to the internal smooth layers is also observed.

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Mitigation of deceleration-phase Rayleigh–Taylor instability growth in inertial confinement fusion implosions

Cited by 2 publications

References 14 publications

Reduction of the deceleration phase to mitigate the negative effect of hydrodynamic instabilities in direct-drive ICF implosions

Reduction of the deceleration phase to mitigate the negative effect of hydrodynamic instabilities in direct-drive ICF implosions

On the effect of initial internal roughness in ICF targets on their compression

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