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

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 tar...

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Bibliographic Details
Published in:Physics of plasmas 2024-06, Vol.31 (6)
Main Authors: Glazyrin, S. I., Zakharov, P. P., Gorodnichev, K. E., Kuratov, S. E.
Format: Article
Language:English
Subjects:
Ablation
Acceleration
Amplitudes
Ignition
Inertial confinement fusion
Perturbation
Taylor instability
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Summary: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.
ISSN:1070-664X
1089-7674
DOI:10.1063/5.0203387