In-flight observations of low-mode ρR asymmetries in NIF implosions
Abstract
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.
- Authors:
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[2];
[3];
[3];
[3]
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- 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)
- Publication Date:
- Research Org.:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center, High Energy Density Physics Div.
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1178796
- Grant/Contract Number:
- NA0001857
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 22; Journal Issue: 5; Conference: Rochester, NY (United States), 22-24 Apr 2015; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
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., and Zacharias, R. In-flight observations of low-mode ρR asymmetries in NIF implosions. United States: N. p., 2015.
Web. doi:10.1063/1.4918355.
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. In-flight observations of low-mode ρR asymmetries in NIF implosions. United States. https://doi.org/10.1063/1.4918355
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., and Zacharias, R. Fri .
"In-flight observations of low-mode ρR asymmetries in NIF implosions". United States. https://doi.org/10.1063/1.4918355. https://www.osti.gov/servlets/purl/1178796.
@article{osti_1178796,
title = {In-flight observations of low-mode ρR asymmetries in NIF implosions},
author = {Zylstra, A. B. and Frenje, J. A. and Seguin, F. H. and Rygg, J. R. and Kritcher, A. and Rosenberg, M. J. and Rinderknecht, H. G. and Hicks, D. G. and Friedrich, S. and Bionta, R. and Meezan, N. B. and Olson, R. and Atherton, J. and Barrios, M. and Bell, P. and Benedetti, R. and Berzak Hopkins, L. and Betti, R. and Bradley, D. and Callahan, D. and Casey, D. and Collins, G. and Dewald, E. L. and Dixit, S. and Doppner, T. and Edwards, M. J. and Gatu Johnson, M. and Glenn, S. and Grim, G. and Hatchett, S. and Jones, O. and Khan, S. and Kilkenny, J. and Kline, J. and Knauer, J. and Kyrala, G. and Landen, O. and LePape, S. and Li, C. K. and Lindl, J. and Ma, T. and Mackinnon, A. and Manuel, M. J.-E. and Meyerhofer, D. and Moses, E. and Nagel, S. R. and Nikroo, A. and Parham, T. and Pak, A. and Petrasso, R. D. and Prasad, R. and Ralph, J. and Robey, H. F. and Ross, J. S. and Sangster, T. C. and Sepke, S. and Sinenian, N. and Sio, H. W. and Spears, B. and Tommasini, R. and Town, R. and Weber, S. and Wilson, D. and Yeamans, C. and Zacharias, R.},
abstractNote = {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.},
doi = {10.1063/1.4918355},
journal = {Physics of Plasmas},
number = 5,
volume = 22,
place = {United States},
year = {Fri May 01 00:00:00 EDT 2015},
month = {Fri May 01 00:00:00 EDT 2015}
}
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