Use of induced spatial incoherence for uniform illumination of laser fusion targets

Lehmberg, R. H.; Obenschain, S. P.

doi:10.1016/0030-4018(83)90024-x

Cited by 348 publications

(106 citation statements)

References 5 publications

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“…The first experiments with the ISI smoothing were conducted at NRL using ISI on Pharos, 10 a Nd:glass laser. In these experiments, ISI smoothing was implemented with an echelon based technique 11 for intensities ranging from 10 13 to 10 14 W/cm 2 . The inclusion of ISI smoothing demonstrated a strong reduction in stimulated Brillouin and stimulated Raman backscatter for 1.054 µm light.…”

Section: Introductionmentioning

confidence: 99%

Laser plasma instability experiments with KrF lasers

Weaver

Afeyan

et al. 2007

Physics of Plasmas

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Deleterious effects of laser-plasma instability (LPI) may limit the maximum laser irradiation that can be used for inertial confinement fusion. The short wavelength (248 nm), large bandwidth, and very uniform illumination available with krypton-fluoride (KrF) lasers should increase the maximum usable intensity by suppressing LPI. The concomitant increase in ablation pressure would allow implosion of low aspect ratio pellets to ignition with substantial gain (>20) at much reduced laser energy. The proposed KrF laser based Fusion Test Facility (FTF) would exploit this strategy to achieve significant fusion power (150 MW) with a rep-rate system that has a per pulse laser energy well below 1 megajoule.

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Section: Introductionmentioning

confidence: 99%

Laser plasma instability experiments with KrF lasers

Weaver

Afeyan

et al. 2007

Physics of Plasmas

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“…We have used the recently developed ablatively-stabilized RM theory [2] to benchmark single-mode simulations of simple (all-Deuterium-Tritium (DT)) pellets [9]. These simulations follow either surface perturbations or imprint from optically smoothed lasers (e.g., induced-spatial-incoherence (ISI) [10] or smoothing by spectral dispersion (SSD) [11] methods). The amplitude of the perturbation is made large enough to resolve (e.g., 1000Å) but small enough to stay in the linear regime.…”

Section: A Compression Phase: Richtmyer-meshkovmentioning

confidence: 99%

Large-scale high-resolution simulations of high gain direct-drive inertial confinement fusion targets

et al. 2004

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Targets have been designed that produce moderate to high gain when directly driven by lasers. The intrinsic sensitivity of these targets to hydro instabilities is found using the FAST(2D) multidimensional radiation hydrocode [J.H. Gardner, A.J. Schmitt, J.P. Dahlburg, et al., Phys. Plasmas 5, 1935(1998], which simulates the simultaneous behavior of a large bandwidth (e.g., = 2 − 256) of perturbations from compression to acceleration, and then to stagnation and burn. The development of the structure in these multi-mode simulations is benchmarked to theoretical analysis and single-mode calculations, which reveals the need to "renormalize" the simulation after compression. The simulations predict that a direct drive point design is expected to degrade significantly from its 1-D clean yield, yet still ignite and give appreciable gain. Simulations of high-gain pellets using a spike prepulse to inhibit Richtmyer-Meshkov growth show a considerable robustness, with high (> 100) gains possible even with nominal surface finishes and laser imprint.

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“…Smoothing techniques (such as phased zone plates [1][2][3], random phase plates [4], kinoform phase plates [5], smoothing by spectral dispersion [6], induced spatial incoherence [7]) have dramatically improved our control on laser implosions and laser--plasma interactions. However, there still remains an issue of non-uniformity at very early times, called 'laser imprint' problem [8][9][10][11][12], which may affect compression uniformity at later times and in particular infl uence the development of the Rayleigh-Taylor instability [13].…”

Section: Introductionmentioning

confidence: 99%

Shock dynamics induced by double-spot laser irradiation of layered targets

et al. 2015

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Abstract. We studied the interaction of a double-spot laser beam with targets using the Prague Asterix Laser System (PALS) iodine laser working at 0.44 m wavelength and intensity of about 10 15 W/cm 2 . Shock breakout signals were recorder using time-resolved self-emission from target rear side of irradiated targets. We compared the behavior of pure Al targets and of targets with a foam layer on the laser side. Results have been simulated using hydrodynamic numerical codes.

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Use of induced spatial incoherence for uniform illumination of laser fusion targets

Cited by 348 publications

References 5 publications

Laser plasma instability experiments with KrF lasers

Laser plasma instability experiments with KrF lasers

Large-scale high-resolution simulations of high gain direct-drive inertial confinement fusion targets

Shock dynamics induced by double-spot laser irradiation of layered targets

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