Symmetry control in subscale near-vacuum hohlraums

Turnbull, D.; Berzak Hopkins, L. F.; Le Pape, S.; Divol, L.; Meezan, N.; Landen, O. L.; Ho, D. D.; Mackinnon, A.; Zylstra, A. B.; Rinderknecht, H. G.; Sio, H.; Petrasso, R. D.; Ross, J. S.; Khan, S.; Pak, A.; Dewald, E. L.; Callahan, D. A.; Hurricane, O.; Hsing, W. W.; Edwards, M. J.

doi:10.1063/1.4950825

Title: Symmetry control in subscale near-vacuum hohlraums

Journal Article · Wed May 18 00:00:00 EDT 2016 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4950825· OSTI ID:1377764

Turnbull, D. ^[1];

^[1]; Le Pape, S. ^[1]; Divol, L. ^[1]; Meezan, N. ^[1];

^[1]; Ho, D. D. ^[1]; Mackinnon, A. ^[2];

^[3];

^[4]; Sio, H. ^[5];

^[5]; Ross, J. S. ^[1]; Khan, S. ^[1]; Pak, A. ^[1]; Dewald, E. L. ^[1];

^[1]; Hurricane, O. ^[1]; Hsing, W. W. ^[1]; Edwards, M. J. ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Controlling the symmetry of indirect-drive inertial confinement fusion implosions remains a key challenge. Increasing the ratio of the hohlraum diameter to the capsule diameter (case-to-capsule ratio, or CCR) facilitates symmetry tuning. By varying the balance of energy between the inner and outer cones as well as the incident laser pulse length, we demonstrate the ability to tune from oblate, through round, to prolate at a CCR of 3.2 in near-vacuum hohlraums at the National Ignition Facility, developing empirical playbooks along the way for cone fraction sensitivity of various laser pulse epochs. Radiation-hydrodynamic simulations with enhanced inner beam propagation reproduce most experimental observables, including hot spot shape, for a majority of implosions. In conclusion, specular reflections are used to diagnose the limits of inner beam propagation as a function of pulse length.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1377764

Alternate ID(s):: OSTI ID: 1253821

Report Number(s):: LLNL-JRNL-687080

Journal Information:: Physics of Plasmas, Vol. 23, Issue 5; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 31 works

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Symmetry control of an indirectly driven high-density-carbon implosion at high convergence and high velocity Divol, L.; Pak, A.; Berzak Hopkins, L. F. Physics of Plasmas, Vol. 24, Issue 5 https://doi.org/10.1063/1.4982215	journal	May 2017
Simulation of self-generated magnetic fields in an inertial fusion hohlraum environment Farmer, W. A.; Koning, J. M.; Strozzi, D. J. Physics of Plasmas, Vol. 24, Issue 5 https://doi.org/10.1063/1.4983140	journal	May 2017
Performance of beryllium targets with full-scale capsules in low-fill 6.72-mm hohlraums on the National Ignition Facility Simakov, A. N.; Wilson, D. C.; Yi, S. A. Physics of Plasmas, Vol. 24, Issue 5 https://doi.org/10.1063/1.4983141	journal	May 2017
Variable convergence liquid layer implosions on the National Ignition Facility Zylstra, A. B.; Yi, S. A.; Haines, B. M. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5016349	journal	May 2018
Comparison of plastic, high density carbon, and beryllium as indirect drive NIF ablators Kritcher, A. L.; Clark, D.; Haan, S. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5018000	journal	May 2018
Visualizing deceleration-phase instabilities in inertial confinement fusion implosions using an “enhanced self-emission” technique at the National Ignition Facility Pickworth, L. A.; Hammel, B. A.; Smalyuk, V. A. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5025188	journal	May 2018
First demonstration of improved capsule implosions by reducing radiation preheat in uranium vs gold hohlraums Dewald, E. L.; Tommasini, R.; Meezan, N. B. Physics of Plasmas, Vol. 25, Issue 9 https://doi.org/10.1063/1.5039385	journal	September 2018
Development of new platforms for hydrodynamic instability and asymmetry measurements in deceleration phase of indirectly driven implosions on NIF Pickworth, L. A.; Hammel, B. A.; Smalyuk, V. A. Physics of Plasmas, Vol. 25, Issue 8 https://doi.org/10.1063/1.5039744	journal	August 2018
Beryllium capsule implosions at a case-to-capsule ratio of 3.7 on the National Ignition Facility Zylstra, A. B.; Yi, S. A.; MacLaren, S. Physics of Plasmas, Vol. 25, Issue 10 https://doi.org/10.1063/1.5041285	journal	October 2018
Experimental study of energy transfer in double shell implosions Merritt, E. C.; Sauppe, J. P.; Loomis, E. N. Physics of Plasmas, Vol. 26, Issue 5 https://doi.org/10.1063/1.5086674	journal	May 2019
Approaching a burning plasma on the NIF Hurricane, O. A.; Springer, P. T.; Patel, P. K. Physics of Plasmas, Vol. 26, Issue 5 https://doi.org/10.1063/1.5087256	journal	May 2019
Maintaining low-mode symmetry control with extended pulse shapes for lower-adiabat Bigfoot implosions on the National Ignition Facility Hohenberger, M.; Casey, D. T.; Thomas, C. A. Physics of Plasmas, Vol. 26, Issue 11 https://doi.org/10.1063/1.5121435	journal	November 2019
Indirect drive ignition at the National Ignition Facility Meezan, N. B.; Edwards, M. J.; Hurricane, O. A. Plasma Physics and Controlled Fusion, Vol. 59, Issue 1 https://doi.org/10.1088/0741-3335/59/1/014021	journal	October 2016
Toward a burning plasma state using diamond ablator inertially confined fusion (ICF) implosions on the National Ignition Facility (NIF) Hopkins, L. Berzak; LePape, S.; Divol, L. Plasma Physics and Controlled Fusion, Vol. 61, Issue 1 https://doi.org/10.1088/1361-6587/aad97e	journal	November 2018
Beyond alpha-heating: driving inertially confined fusion implosions toward a burning-plasma state on the National Ignition Facility Hurricane, O. A.; Callahan, D. A.; Springer, P. T. Plasma Physics and Controlled Fusion, Vol. 61, Issue 1 https://doi.org/10.1088/1361-6587/aaed71	journal	November 2018
Progress of indirect drive inertial confinement fusion in the United States Kline, J. L.; Batha, S. H.; Benedetti, L. R. Nuclear Fusion, Vol. 59, Issue 11 https://doi.org/10.1088/1741-4326/ab1ecf	journal	July 2019

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