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

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

doi:10.1063/1.4939833

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

Journal Article · Thu Jan 14 00:00:00 EST 2016 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4939833· OSTI ID:1296678

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

CEA, DAM, DIF, Arpajon (France)
Univ. of Rochester, Rochester, NY (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Univ. of Nevada, Reno, NV (United States)
CEA, CVA, 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-resolvedmeasurement 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 measuredneutron number is about 80% of the prediction. Lastly, for the 2-step 2-ns pulse, we test here that this ratio falls to about 20%.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: CEA, France; USDOE

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1296678

Report Number(s):: LA-UR-15-28834

Journal Information:: Physics of Plasmas, Vol. 23, Issue 1; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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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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