Laser compression and stability in inertial confinement fusion

McCrory, R. L.; Soures, J. M.; Verdon, C. P.; Skupsky, S.; Kessler, T. J.; Letzring, S.; Seka, W.; Craxton, R. S.; Short, R. W.; Jaanimagi, P. A.; Skeldon, Mark D.; Bradley, D. K.; Delettrez, J. A.; Keck, R. L.; Kim, H; Knauer, J. P.; Kremens, R. L.; Marshall, F. J.

doi:10.1088/0741-3335/31/10/004

Cited by 8 publications

(3 citation statements)

References 35 publications

(33 reference statements)

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“…It has been shown in Figure 3(b). It is to be noted that in our uniform compression model predicts a good qualitative agreement with the corresponding experimental and simulation results for both cylindrical [13]- [15] and spherical geo-metries [18] [19]. However, there may be more complicated physics behind the compression during stagnation time.…”

Section: Numerical Results and Discussionsupporting

confidence: 79%

“…Our analytical results are found to agree qualitatively with recent simulation and experimental results obtained in cylindrical geometry. Also in the spherical geometry, during compression the density of the DT fuel increases many times more than the density of the DT gas [18] [19] in the compressed shell within the core of the spherical target.…”

Section: Introductionmentioning

confidence: 99%

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Shock Induced Symmetric Compression in a Spherical Target

Mandal¹,

Roy²,

Khan³

et al. 2015

JMP

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Shock induced symmetric compression has been studied in a spherical target. The shock induced interfacial radius will shrink and would reach a minimum point during implosion situation. However, after implosion the plasma tries to expand in blow off/explosion situation and as a result the interfacial radius will increase. Effects of plasma parameters like density and temperature have been studied numerically. It is seen that the density increases many times due to the mass conservation in imploding situation of a compressible shell like ICF. However, temperature will change rapidly due to change of inner density and so would be the pressure of compressible fluid following adiabatic law. Our analytical results agree qualitatively with those of simulation results in spherical geometry and also experimental observations conducted in cylindrical container.

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Section: Numerical Results and Discussionsupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Shock Induced Symmetric Compression in a Spherical Target

Mandal¹,

Roy²,

Khan³

et al. 2015

JMP

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show abstract

“…Similarly, during the blow off(deceleration phase) the fluid is relaxed to expand and fluid density falls exponentially from the perturbation surface. During robustness compression [19] − [21] of direct driven ICF target, the density can be compressed by 100 to 200 times of liquid DT density at cryogenic temperature [22] − [23]. Perturbation amplitudes and its growth rates of hydrodynamical instabilities of laser fusion targets has been studied in acceleration and deceleration phase including the heat conduction effect [24] − [25]using Lagrangian formulation.…”

Section: Introductionmentioning

confidence: 99%

Richtmyer - Meshkov instability in a spherical target with density variation

Mandal,

Roy,

Banerjee

et al. 2011

Preprint

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The motion of unstable fluid interface due to Richtmyer -Meshkov (RM) instability incorporating with density variation has been studied in a spherical target using Lagrangian formulation. During the compression in Inertial Confinement Fusion (ICF) process, the density of deuterium -tritium (DT) fuel increases 1000 times greater than the density of gaseous DT fuel within the core of spherical target. We have extended the feature of density variation [PRA,84-Mikaelian & Lindl] in spherical geometry.Due to convergent shock impingement, the perturbed interface will be nonspherical which leads to the density variation in both radial as well as in polar angle. We have shown that the interface of perturbed surface decreases with time to reach a minimum and then kick back to gradual increase. As the perturbed radius decreases, the density increases and reaches a maxima corresponding to a minima of perturbed radius. This is the practical situation of density characteristics during implosion of ICF. The numerical results based on our analytical work show a good qualitative agreement with some experimental as well as simulation results.

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Short-wavelength-laser requirements for direct-drive ignition and gain

et al. 1993

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Inertial confinement fusion (ICF) requires high compression of fusion fuel to densities approaching 1000 times liquid density of deuterium-tritium (D-T) at central temperatures in excess of 5 keV. The goal of ICF is to achieve high gain (of the order of 100 or greater) in the laboratory. To meet this objective with minimum driver energy, a number of central issues must be addressed. Research in ICF with laser drivers has shown the importance of using short wavelength (X < 0.5 urn). To achieve conditions for high gain at driver energies of a few megajoules or less, high intensities (>10 14 W/cm 2 ) are required. The directdrive approach to ICF is more energy efficient than indirect drive if the stringent drive symmetry and hydrodynamic stability requirements can be met by a suitable laser irradiation scheme and target design. Experiments carried out at 351 nm on the 2-kJ, 24-beam OMEGA laser system at the Laboratory for Laser Energetics (LLE) at the University of Rochester, and future experiments to be performed on a 30-kJ upgrade of this laser, can resolve the remaining physics issues for direct drive: (1) energy coupling and transport scaling; (2) irradiation-uniformity requirements for high gain; (3) hydrodynamic stability constraints; and (4) hot-spot and main-fuel-layer physics. We review progress made on achieving uniform drive conditions with the OMEGA system and present results for direct-drive cryogenic-fuel-capsule and CD-shell, "surrogate" cryogenic-capsule implosion experiments that illustrate the constraints imposed by hydrodynamic instabilities and drive uniformity on the design of high-performance direct-drive targets. Target designs have been identified that will explore the ignition-scaling regime using the OMEGA Upgrade. Experiments on the OMEGA Upgrade will signal whether or not there is a high probability of achieving modest to high gain using direct drive on an upgrade of the NOVA facility.

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Laser compression and stability in inertial confinement fusion

Cited by 8 publications

References 35 publications

Shock Induced Symmetric Compression in a Spherical Target

Shock Induced Symmetric Compression in a Spherical Target

Richtmyer - Meshkov instability in a spherical target with density variation

Short-wavelength-laser requirements for direct-drive ignition and gain

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