In-flight observations of low-mode ρR asymmetries in NIF implosions

Zylstra, A. B.; Frenje, J. A.; Seguin, F. H.; Rygg, J. R.; Kritcher, A.; Rosenberg, M. J.; Rinderknecht, H. G.; Hicks, D. G.; Friedrich, S.; Bionta, R.; Meezan, N. B.; Olson, R.; Atherton, J.; Barrios, M.; Bell, P.; Benedetti, R.; Berzak Hopkins, L.; Betti, R.; Bradley, D.; Callahan, D.; Casey, D.; Collins, G.; Dewald, E. L.; Dixit, S.; Doppner, T.; Edwards, M. J.; Gatu Johnson, M.; Glenn, S.; Grim, G.; Hatchett, S.; Jones, O.; Khan, S.; Kilkenny, J.; Kline, J.; Knauer, J.; Kyrala, G.; Landen, O.; LePape, S.; Li, C. K.; Lindl, J.; Ma, T.; Mackinnon, A.; Manuel, M. J.-E.; Meyerhofer, D.; Moses, E.; Nagel, S. R.; Nikroo, A.; Parham, T.; Pak, A.; Petrasso, R. D.; Prasad, R.; Ralph, J.; Robey, H. F.; Ross, J. S.; Sangster, T. C.; Sepke, S.; Sinenian, N.; Sio, H. W.; Spears, B.; Tommasini, R.; Town, R.; Weber, S.; Wilson, D.; Yeamans, C.; Zacharias, R.

doi:10.1063/1.4918355

Title: In-flight observations of low-mode ρR asymmetries in NIF implosions

Journal Article · Fri May 01 00:00:00 EDT 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4918355· OSTI ID:1178796

Zylstra, A. B. ^[1];

^[2]; Seguin, F. H. ^[1]; Rygg, J. R. ^[3]; Kritcher, A. ^[3]; Rosenberg, M. J. ^[2]; Rinderknecht, H. G. ^[1];

^[3]; Friedrich, S. ^[3]; Bionta, R. ^[3]; Meezan, N. B. ^[3]; Olson, R. ^[4]; Atherton, J. ^[3]; Barrios, M. ^[3]; Bell, P. ^[3]; Benedetti, R. ^[3];

^[3]; Betti, R. ^[5]; Bradley, D. ^[3];

^[3] more »

Massachusetts Institute of Technology, Cambridge, MA (United States). Plasma Science and Fusion Center, High Energy Density Physics Div.
Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts (United States)
Lawrence Livermore National Laboratory, Livermore, California (United States)
Los Alamos National Laboratory, Los Alamos, New Mexico (United States)
Laboratory for Laser Energetics, University of Rochester, Rochester, New York (United States)
Lawrence Livermore National Laboratory,Livermore, California (United States)
General Atomics, San Diego, California (United States)

Charged-particle spectroscopy is used to assess implosion symmetry in ignition-scale indirect-drive implosions for the first time. Surrogate D₃He gas-filled implosions at the National Ignition Facility produce energetic protons via D+₃He fusion that are used to measure the implosion areal density (ρR) at the shock-bang time. By using protons produced several hundred ps before the main compression bang, the implosion is diagnosed in-flight at a convergence ratio of 3-5 just prior to peak velocity. This isolates acceleration-phase asymmetry growth. For many surrogate implosions, proton spectrometers placed at the north pole and equator reveal significant asymmetries with amplitudes routinely ≳10%, which are interpreted as l=2 Legendre modes. With significant expected growth by stagnation, it is likely that these asymmetries would degrade the final implosion performance. X-ray self-emission images at stagnation show asymmetries that are positively correlated with the observed in-flight asymmetries and comparable in magnitude, contradicting growth models; this suggests that the hot-spot shape does not reflect the stagnated shell shape or that significant residual kinetic energy exists at stagnation. More prolate implosions are observed when the laser drive is sustained (“no-coast”), implying a significant time-dependent asymmetry in peak drive.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center, High Energy Density Physics Div.

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0001857

OSTI ID:: 1178796

Journal Information:: Physics of Plasmas, Vol. 22, Issue 5; Conference: Rochester, NY (United States), 22-24 Apr 2015; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 21 works

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