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Title: Using a 2-shock 1D platform at NIF to measure the effect of convergence on mix and symmetry

Abstract

In this paper, we describe the use of a robust new 1-D like implosion platform at the National Ignition Facility [G. H. Miller et al., Opt. Eng. 43, 2841 (2004)] to study the effect of convergence on mix and shape. Previous experiments suggest that nuclear yields and ion temperature degrade with increased convergence [M. D. Cable et al., Phys. Rev. Lett. 73, 2316 (1994)] due to enhanced perturbation growth and mix, but little has been reported on the distortion of the shape with time. The 2-shock platform was developed [S. F. Khan et al., Phys. Plasmas 23, 042708 (2016)] to maintain a high degree of sphericity during the whole implosion phase and has a thick, uniformly doped (1% Si) plastic CH shell to minimize the effect of mixing due to hydrodynamic feed-through from the outer ablator surface. An inner layer of deuterated plastic (CD) and hydrogen-tritium (DT) gas fill allows for the measurement of DT neutrons produced by the mix between the gas and ablator. DD neutrons provide information about the hot, unmixed CD region. By changing the fill gas density while keeping the capsule diameter, ablator thickness, and Au hohlraum conditions fixed, the x-ray hot spot convergence ratio wasmore » varied from 14 to 22. We find that the atomic mix (DT yield) grows linearly as a function of convergence, but since Tion changes as well, it does not necessarily mean that the amount or extent of mix grows linearly as well. Lastly, we also find the DD yield, which is a measurement of the shell heating, saturates above a certain convergence.« less

Authors:
ORCiD logo [1];  [2];  [2]; ORCiD logo [2];  [2];  [2]; ORCiD logo [2];  [2]; ORCiD logo [1];  [2];  [2];  [2];  [2]; ORCiD logo [2];  [2]; ORCiD logo [2];  [2]; ORCiD logo [2];  [3];  [2] more »;  [2]; ORCiD logo [2]; ORCiD logo [2];  [2]; ORCiD logo [1]; ORCiD logo [2];  [2];  [2]; ORCiD logo [2];  [2];  [4];  [4] « less
+ Show Author Affiliations
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Lawrence Livermore National Laboratory, Livermore, California 94559, USA
  4. General Atomics, San Diego, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); General Atomics
OSTI Identifier:
1637583
Alternate Identifier(s):
OSTI ID: 1476128; OSTI ID: 1479936
Report Number(s):
LLNL-JRNL-793197; LA-UR-18-21677
Journal ID: ISSN 1070-664X; 992012; TRN: US2201640
Grant/Contract Number:  
AC52-07NA27344; AC52-06NA25396; NA0001808
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 10; 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; Bremsstrahlung; x-ray imaging; isotopes; nuclear symmetry energy; electromagnetic radiation detectors; plasma confinement; x-ray spectroscopy; tritium; Implosion; NIF; copnvergence

Citation Formats

Kyrala, George Amine, Pino, J. E., Khan, S. F., MacLaren, S. A., Salmonson, J. D., Ma, T., Masse, L., Tipton, R., Bradley, Paul Andrew, Rygg, J. R., Field, J. E., Tommasini, R., Ralph, J. E., Turnbull, D. P., Mackinnon, A. J., Benedetti, L. R., Bradley, D. K., Nagel, S., Celliers, P. M., Dewald, E., Dittrich, T. R., Berzak Hopkins, L., Izumi, N., Kervin, M. L., Kline, John L., Yeamans, C., Hatarik, R., Sayre, D., Hartouni, E. P., Pak, A., Chen, K. C., and Hoover, D. E. Using a 2-shock 1D platform at NIF to measure the effect of convergence on mix and symmetry. United States: N. p., 2018. Web. doi:10.1063/1.5038570.
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Kyrala, George Amine, Pino, J. E., Khan, S. F., MacLaren, S. A., Salmonson, J. D., Ma, T., Masse, L., Tipton, R., Bradley, Paul Andrew, Rygg, J. R., Field, J. E., Tommasini, R., Ralph, J. E., Turnbull, D. P., Mackinnon, A. J., Benedetti, L. R., Bradley, D. K., Nagel, S., Celliers, P. M., Dewald, E., Dittrich, T. R., Berzak Hopkins, L., Izumi, N., Kervin, M. L., Kline, John L., Yeamans, C., Hatarik, R., Sayre, D., Hartouni, E. P., Pak, A., Chen, K. C., & Hoover, D. E. Using a 2-shock 1D platform at NIF to measure the effect of convergence on mix and symmetry. United States. https://doi.org/10.1063/1.5038570
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Kyrala, George Amine, Pino, J. E., Khan, S. F., MacLaren, S. A., Salmonson, J. D., Ma, T., Masse, L., Tipton, R., Bradley, Paul Andrew, Rygg, J. R., Field, J. E., Tommasini, R., Ralph, J. E., Turnbull, D. P., Mackinnon, A. J., Benedetti, L. R., Bradley, D. K., Nagel, S., Celliers, P. M., Dewald, E., Dittrich, T. R., Berzak Hopkins, L., Izumi, N., Kervin, M. L., Kline, John L., Yeamans, C., Hatarik, R., Sayre, D., Hartouni, E. P., Pak, A., Chen, K. C., and Hoover, D. E. Mon . "Using a 2-shock 1D platform at NIF to measure the effect of convergence on mix and symmetry". United States. https://doi.org/10.1063/1.5038570. https://www.osti.gov/servlets/purl/1637583.
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@article{osti_1637583,
title = {Using a 2-shock 1D platform at NIF to measure the effect of convergence on mix and symmetry},
author = {Kyrala, George Amine and Pino, J. E. and Khan, S. F. and MacLaren, S. A. and Salmonson, J. D. and Ma, T. and Masse, L. and Tipton, R. and Bradley, Paul Andrew and Rygg, J. R. and Field, J. E. and Tommasini, R. and Ralph, J. E. and Turnbull, D. P. and Mackinnon, A. J. and Benedetti, L. R. and Bradley, D. K. and Nagel, S. and Celliers, P. M. and Dewald, E. and Dittrich, T. R. and Berzak Hopkins, L. and Izumi, N. and Kervin, M. L. and Kline, John L. and Yeamans, C. and Hatarik, R. and Sayre, D. and Hartouni, E. P. and Pak, A. and Chen, K. C. and Hoover, D. E.},
abstractNote = {In this paper, we describe the use of a robust new 1-D like implosion platform at the National Ignition Facility [G. H. Miller et al., Opt. Eng. 43, 2841 (2004)] to study the effect of convergence on mix and shape. Previous experiments suggest that nuclear yields and ion temperature degrade with increased convergence [M. D. Cable et al., Phys. Rev. Lett. 73, 2316 (1994)] due to enhanced perturbation growth and mix, but little has been reported on the distortion of the shape with time. The 2-shock platform was developed [S. F. Khan et al., Phys. Plasmas 23, 042708 (2016)] to maintain a high degree of sphericity during the whole implosion phase and has a thick, uniformly doped (1% Si) plastic CH shell to minimize the effect of mixing due to hydrodynamic feed-through from the outer ablator surface. An inner layer of deuterated plastic (CD) and hydrogen-tritium (DT) gas fill allows for the measurement of DT neutrons produced by the mix between the gas and ablator. DD neutrons provide information about the hot, unmixed CD region. By changing the fill gas density while keeping the capsule diameter, ablator thickness, and Au hohlraum conditions fixed, the x-ray hot spot convergence ratio was varied from 14 to 22. We find that the atomic mix (DT yield) grows linearly as a function of convergence, but since Tion changes as well, it does not necessarily mean that the amount or extent of mix grows linearly as well. Lastly, we also find the DD yield, which is a measurement of the shell heating, saturates above a certain convergence.},
doi = {10.1063/1.5038570},
journal = {Physics of Plasmas},
number = 10,
volume = 25,
place = {United States},
year = {Mon Oct 01 00:00:00 EDT 2018},
month = {Mon Oct 01 00:00:00 EDT 2018}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1063/1.5038570
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Cited by: 5 works
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Figures / Tables:

FIG. 1 FIG. 1 : The 2-Shock platform showing the size of the gold hohlraum used, 9.43 mm Length x 5.75 mm inner diameter, with a 3.11 mm diameter laser entrance hole (LEH) window. The capsule was mounted in the midplane of the hohlraum between two 40 nm thick tents. We alsomore » show a schematic diagram of the two types of capsules used, a baseline and a CD mix capsule.« less
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Works referenced in this record:

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    Works referencing / citing this record:

    Pushered single shell implosions for mix and radiation trapping studies using high-Z layers on National Ignition Facility
    journal, July 2019

    • Dewald, E. L.; Pino, J. E.; Tipton, R. E.
    • Physics of Plasmas, Vol. 26, Issue 7
    • DOI: 10.1063/1.5109426
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      Figures / Tables found in this record:

      FIG. 1 (p. 9)figure
      Table 1 (p. 10)table
      Table 2 (p. 11)table
      FIG. 2 (p. 12)figure
      FIG. 3 (p. 13)figure
      FIG. 4 (p. 13)figure
      FIG. 5 (p. 16)figure
      FIG. 6 (p. 17)figure
      FIG. 7 (p. 17)figure
      FIG. 8 (p. 19)figure
      Table 3 (p. 20)table
      FIG. 9 (p. 21)figure
      FIG. 10 (p. 22)figure
      FIG. 11 (p. 23)figure
      FIG. 12 (p. 25)figure
      FIG. 13 (p. 27)figure
      FIG. 14 (p. 27)figure
      FIG. 15 (p. 28)figure
      FIG. 16 (p. 29)figure
      FIG. 17 (p. 30)figure
      FIG. 18 (p. 31)figure
      Table 4 (p. 32)table
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