Space-Time Implosion Characteristics of Laser-Irradiated Fusion Targets

Attwood, David; Coleman, L. W.; Boyle, M. J.; Larsen, Jon; Phillion, D. W.; Manes, Kenneth R.

doi:10.1103/physrevlett.38.282

Cited by 27 publications

(3 citation statements)

References 7 publications

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“…Early planar experiments investigated the rocket efficiency using shadowgraphy and the peak x-ray emission from the coronal plasma. [10][11][12] In more-recent studies, time-averaged velocities were inferred from neutron bang-time measurements 13,14 and time-resolved velocities have been determined using x-ray backlighting. [15][16][17][18] In the directdrive experiments, the absorbed energy has been varied by changing the intensity of the laser, the wavelength of the laser, the aspect ratio (thickness over the diameter of the shell) of the target, and the diameter of the laser beams relative to the target diameter.…”

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“…[15][16][17][18] In the directdrive experiments, the absorbed energy has been varied by changing the intensity of the laser, the wavelength of the laser, the aspect ratio (thickness over the diameter of the shell) of the target, and the diameter of the laser beams relative to the target diameter. 8,[12][13][14][15] An extensive indirect-drive study of the implosion velocity was conducted at the National Ignition Facility, where the dopant material and dopant concentration were varied while maintaining a nearly constant A Z (Ref. The experiments employed 60 OMEGA ultraviolet (m 0 = 351 nm) laser beams that uniformly illuminated the target and were smoothed by polarization smoothing, 19 smoothing by spectral dispersion, 20 and distributed phase plates [fourth-order super-Gaussian with a 650-nm full width at half maximum (FWHM)].…”

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Demonstration of the Improved Rocket Efficiency in Direct-Drive Implosions Using Different Ablator Materials

et al. 2013

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The success of direct-drive implosions depends critically on the ability to create high ablation pressures (∼100 Mbar) and accelerating the imploding shell to ignition-relevant velocities (>3.7×10(7 ) cm/s) using direct laser illumination. This Letter reports on an experimental study of the conversion of absorbed laser energy into kinetic energy of the shell (rocket efficiency) where different ablators were used to vary the ratio of the atomic number to the atomic mass. The implosion velocity of Be shells is increased by 20% compared to C and CH shells in direct-drive implosions when a constant initial target mass is maintained. These measurements are consistent with the predicted increase in the rocket efficiency of 28% for Be and 5% for C compared to a CH ablator.

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Demonstration of the Improved Rocket Efficiency in Direct-Drive Implosions Using Different Ablator Materials

et al. 2013

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“…on the electron energy deposition. In fact, this diagnostic technique appears to be somewhat complementary to more conventional methods [6] such as target self-emission recording as giving access to the characteristics of higher-density and lowertemperature regions. Measurements give evidence that for a target with given wall thickness an irradiance threshold exists for the explosive-pusher regime.…”

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confidence: 99%