Measurements of core and pusher conditions in surrogate capsule implosions on the OMEGA laser system

Bradley, D. K.; Delettrez, J. A.; Epstein, R.; Town, R. P. J.; Verdon, C. P.; Yaakobi, B.; Regan, S. P.; Marshall, F. J.; Boehly, T. R.; Knauer, J. P.; Meyerhofer, D. D.; Smalyuk, V. A.; Seka, W.; Haynes, Donald A.; Gunderson, Michael A.; Junkel, Gwyneth; Hooper, C. F.; Bell, P. M.; Ognibene, T. J.; Lerche, R. A.

doi:10.1063/1.872858

Cited by 36 publications

(13 citation statements)

References 29 publications

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“…[1][2][3][4][5][6] The temperature of the warm part of the shell can be measured from the spectral shape of 1sϪ2p absorption lines in warm titanium, and the minimum shell temperature can be measured from the spectral shift of the titanium K edge. 2,6 The shell areal density can be determined from the titanium 1sϪ2p and K-edge absorption.…”

Section: Introductionmentioning

confidence: 99%

Compressed-shell integrity measurements in spherical implosion experiments

et al. 2001

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The shell integrity near peak compression of spherical implosions using the 60-beam, 30-kJ UV OMEGA laser system [Opt. Commun. 133, 495 (1997)] has been measured. Hot core emission backlights a shell with a thin titanium-doped layer that is imaged at x-ray photon energies above and below the titanium K edge. The x-ray intensity ratio between the two images is related to perturbations in the cold, or absorbing, part of the shell. The measured cold-shell areal-density modulations, integrated over the time of peak compression, are of the order of 25% to 50% with nonuniformity spectra peaked at spatial wavelengths of 30 to 50 μm and with the smallest detectable nonuniformity features extending down to spatial wavelengths of 12 to 15 μm. Hot-shell areal-density modulations of the emitting part of the shell (inner edge) are of the order of 13% to 20%. The measured shell modulations are in agreement with the results of two-dimensional simulations that include initial shell perturbations, imprinted shell modulations due to nonuniformities in a single laser beam, and a beam-to-beam energy imbalance in the laser drive.

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Section: Introductionmentioning

confidence: 99%

Compressed-shell integrity measurements in spherical implosion experiments

et al. 2001

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“…[40][41][42][43] Figure 2 shows an illustration of the generic experimental setup common to all four of the Omega experiments discussed in this report. The target package differs from experiment to experiment.…”

Section: Configuration Of the Experimental Testbedmentioning

confidence: 99%

An experimental testbed for the study of hydrodynamic issues in supernovae

et al. 2001

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More than a decade after the explosion of supernova 1987A, unresolved discrepancies still remain in attempts to numerically simulate the mixing processes initiated by the passage of a very strong shock through the layered structure of the progenitor star. Numerically computed velocities of the radioactive 56 Ni and 56 Co, produced by shock-induced explosive burning within the silicon layer, for example, are still more than 50% too low as compared with the measured velocities. To resolve such discrepancies between observation and simulation, an experimental testbed has been designed on the Omega Laser for the study of hydrodynamic issues of importance to supernovae ͑SNe͒. In this paper, results are presented from a series of scaled laboratory experiments designed to isolate and explore several issues in the hydrodynamics of supernova explosions. The results of the experiments are compared with numerical simulations and are generally found to be in reasonable agreement.

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“…A great deal of work has already been done in this area, most of it in planar geometry, [6][7][8][9][10][11][12][13][14][15] although some has been done in both cylindrical 16 -20 and spherical [21][22][23][24] geometries. Recent theoretical work has investigated both RM 25 and RT 26 in convergent geometries.…”

Section: Introductionmentioning

confidence: 99%

Observation and simulation of plasma mix after reshock in a convergent geometry

et al. 2004

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Experiments to study the effect of a second, counterpropagating shock on the growth of hydrodynamic instabilities in a convergent, compressible system have been performed on the Omega Laser [T. R. Boehly et al., Opt. Commun. 133, 495 (1997)] at the University of Rochester. Direct laser illumination of a cylindrical target launches a strong shock across hydrodynamically unstable interfaces formed between an epoxy ablator material on the outside, a buried aluminum marker layer and low-density CH foam on the inside. The Richtmyer–Meshkov instability mixes the marker into the two adjacent materials. Of particular interest is what happens when the mixing region is reshocked by using a second, coaxial central cylinder to reflect the incident shock back into the mixing region. These experiments have been extensively modeled, in two dimensions, using the hydrocodes NYM [P. D. Roberts et al., J. Phys. D 13, 1957 (1980)], PETRA [D. L. Youngs, Physica D 12, 32 (1984)], and RAGE [R. M. Baltrusaitis et al., Phys. Fluids 8, 2471 (1996)]. Good agreement is shown between the simulations and experimental data.

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Measurements of core and pusher conditions in surrogate capsule implosions on the OMEGA laser system

Cited by 36 publications

References 29 publications

Compressed-shell integrity measurements in spherical implosion experiments

Compressed-shell integrity measurements in spherical implosion experiments

An experimental testbed for the study of hydrodynamic issues in supernovae

Observation and simulation of plasma mix after reshock in a convergent geometry

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