Time history prediction of direct-drive implosions on the Omega facility

Laffite, S.; Bourgade, J. L.; Caillaud, T.; Girard, F.; Landoas, O.; Lemaire, S.; Masse, L.; Masson-Laborde, P. E.; Philippe, F.; Reverdin, C.; Tassin, V.; Delettrez, J. A.; Glebov, V. Yu.; Marshall, F. J.; Michel, D. T.; Seka, W.; Frenje, J. A.; Joshi, T.; Mancini, R. C.; Legay, G.

doi:10.1063/1.4939833

Title: Time history prediction of direct-drive implosions on the Omega facility

Journal Article · Fri Jan 15 00:00:00 EST 2016 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4939833· OSTI ID:22493828

Laffite, S.; Bourgade, J. L.; Caillaud, T.; Girard, F.; Landoas, O.; Lemaire, S.; Masse, L.; Masson-Laborde, P. E.; Philippe, F.; Reverdin, C.; Tassin, V. ^[1]; Delettrez, J. A.; Glebov, V. Yu.; Marshall, F. J.; Michel, D. T.; Seka, W. ^[2]; Frenje, J. A. ^[3]; Joshi, T.; Mancini, R. C. ^[4]; Legay, G. ^[5]

CEA, DAM, DIF, F-91297 Arpajon (France)
Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299 (United States)
Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
Physics Department, University of Nevada, Reno, Nevada 89557 (United States)
CEA, CVA, 21120 Is-sur-Tille (France)

We present in this article direct-drive experiments that were carried out on the Omega facility [T. R. Boehly et al., Opt. Commun. 133, 495 (1997)]. Two different pulse shapes were tested in order to vary the implosion stability of the same target whose parameters, dimensions and composition, remained the same. The direct-drive configuration on the Omega facility allows the accurate time-resolved measurement of the scattered light. We show that, provided the laser coupling is well controlled, the implosion time history, assessed by the “bang-time” and the shell trajectory measurements, can be predicted. This conclusion is independent on the pulse shape. In contrast, we show that the pulse shape affects the implosion stability, assessed by comparing the target performances between prediction and measurement. For the 1-ns square pulse, the measured neutron number is about 80% of the prediction. For the 2-step 2-ns pulse, we test here that this ratio falls to about 20%.

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OSTI ID:: 22493828

Journal Information:: Physics of Plasmas, Vol. 23, Issue 1; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X

Country of Publication:: United States

Language:: English

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Cited By (2)

Weakly nonlinear incompressible Rayleigh-Taylor instability in spherical and planar geometries Zhang, J.; Wang, L. F.; Ye, W. H. Physics of Plasmas, Vol. 25, Issue 2 https://doi.org/10.1063/1.5017749	journal	February 2018
A simulation-based model for understanding the time dependent x-ray drive asymmetries and error bars in indirectly driven implosions on the National Ignition Facility Masse, L.; Clark, D.; MacLaren, S. Physics of Plasmas, Vol. 26, Issue 6 https://doi.org/10.1063/1.5092827	journal	June 2019

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46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
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