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Title: Hydrodynamic instability growth of three-dimensional modulations in radiation-driven implosions with “low-foot” and “high-foot” drives at the National Ignition Facility

Abstract

Hydrodynamic instability growth has been studied using three-dimensional (3-D) broadband modulations by comparing “high-foot” and “low-foot” spherical plastic (CH) capsule implosions at the National Ignition Facility (NIF). The initial perturbations included capsule outer-surface roughness and capsule-mounting membranes (“tents”) that were similar to those used in a majority of implosions on NIF. The tents with thicknesses of 31-nm, 46-nm, and 109-nm were used in the experiments. The outer-surface roughness in the “low-foot” experiment was similar to the standard specification, while it was increased by ~4 times in the “high-foot” experiment to compensate for the reduced growth. The ablation-front instability growth was measured using a Hydrodynamic Growth Radiography platform at a convergence ratio of 3. The dominant capsule perturbations, generated by the tent mountings, had measured perturbation amplitudes comparable to the capsule thickness with the “low-foot” drive. These tent perturbations were reduced by ~3 to 10 times in implosions with the “high-foot” drive. Unexpectedly, the measured perturbations with initially thinner tents were either larger or similar to the measured perturbations with thicker tents for both “high-foot” and “low-foot” drives. While the measured instability growth of 3-D broadband perturbations was also significantly reduced by ~5 to 10 times with the “high-foot” drive, comparedmore » to the “low-foot” drive, the growth mitigation was stronger than expected based on previous “growth-factor” results measured with two-dimensional modulations. Lastly, one of the hypotheses to explain the results is based on the 3-D modulations of the oxygen content in the bulk of the capsule having a stronger effect on the overall growth of capsule perturbations than the outer-surface capsule roughness.« less

Authors:
 [1];  [1];  [1];  [1];  [2]; ORCiD logo [1]; ORCiD logo [2];  [1];  [1]; ORCiD logo [1];  [1];  [1];  [2];  [1]; ORCiD logo [1]; ORCiD logo [1];  [1];  [1];  [2]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. General Atomics, San Diego, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1367963
Report Number(s):
LLNL-JRNL-718396
Journal ID: ISSN 1070-664X
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 4; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 70 PLASMA PHYSICS AND FUSION

Citation Formats

Smalyuk, V. A., Weber, C. R., Robey, H. F., Casey, D. T., Chen, K. -C., Clark, D. S., Farrell, M., Felker, S., Field, J. E., Haan, S. W., Hammel, B. A., Hamza, A. V., Hoover, D., Kroll, J. J., Landen, O. L., MacPhee, A. G., Martinez, D., Nikroo, A., and Rice, N. Hydrodynamic instability growth of three-dimensional modulations in radiation-driven implosions with “low-foot” and “high-foot” drives at the National Ignition Facility. United States: N. p., 2017. Web. doi:10.1063/1.4980002.
Smalyuk, V. A., Weber, C. R., Robey, H. F., Casey, D. T., Chen, K. -C., Clark, D. S., Farrell, M., Felker, S., Field, J. E., Haan, S. W., Hammel, B. A., Hamza, A. V., Hoover, D., Kroll, J. J., Landen, O. L., MacPhee, A. G., Martinez, D., Nikroo, A., & Rice, N. Hydrodynamic instability growth of three-dimensional modulations in radiation-driven implosions with “low-foot” and “high-foot” drives at the National Ignition Facility. United States. doi:10.1063/1.4980002.
Smalyuk, V. A., Weber, C. R., Robey, H. F., Casey, D. T., Chen, K. -C., Clark, D. S., Farrell, M., Felker, S., Field, J. E., Haan, S. W., Hammel, B. A., Hamza, A. V., Hoover, D., Kroll, J. J., Landen, O. L., MacPhee, A. G., Martinez, D., Nikroo, A., and Rice, N. Tue . "Hydrodynamic instability growth of three-dimensional modulations in radiation-driven implosions with “low-foot” and “high-foot” drives at the National Ignition Facility". United States. doi:10.1063/1.4980002. https://www.osti.gov/servlets/purl/1367963.
@article{osti_1367963,
title = {Hydrodynamic instability growth of three-dimensional modulations in radiation-driven implosions with “low-foot” and “high-foot” drives at the National Ignition Facility},
author = {Smalyuk, V. A. and Weber, C. R. and Robey, H. F. and Casey, D. T. and Chen, K. -C. and Clark, D. S. and Farrell, M. and Felker, S. and Field, J. E. and Haan, S. W. and Hammel, B. A. and Hamza, A. V. and Hoover, D. and Kroll, J. J. and Landen, O. L. and MacPhee, A. G. and Martinez, D. and Nikroo, A. and Rice, N.},
abstractNote = {Hydrodynamic instability growth has been studied using three-dimensional (3-D) broadband modulations by comparing “high-foot” and “low-foot” spherical plastic (CH) capsule implosions at the National Ignition Facility (NIF). The initial perturbations included capsule outer-surface roughness and capsule-mounting membranes (“tents”) that were similar to those used in a majority of implosions on NIF. The tents with thicknesses of 31-nm, 46-nm, and 109-nm were used in the experiments. The outer-surface roughness in the “low-foot” experiment was similar to the standard specification, while it was increased by ~4 times in the “high-foot” experiment to compensate for the reduced growth. The ablation-front instability growth was measured using a Hydrodynamic Growth Radiography platform at a convergence ratio of 3. The dominant capsule perturbations, generated by the tent mountings, had measured perturbation amplitudes comparable to the capsule thickness with the “low-foot” drive. These tent perturbations were reduced by ~3 to 10 times in implosions with the “high-foot” drive. Unexpectedly, the measured perturbations with initially thinner tents were either larger or similar to the measured perturbations with thicker tents for both “high-foot” and “low-foot” drives. While the measured instability growth of 3-D broadband perturbations was also significantly reduced by ~5 to 10 times with the “high-foot” drive, compared to the “low-foot” drive, the growth mitigation was stronger than expected based on previous “growth-factor” results measured with two-dimensional modulations. Lastly, one of the hypotheses to explain the results is based on the 3-D modulations of the oxygen content in the bulk of the capsule having a stronger effect on the overall growth of capsule perturbations than the outer-surface capsule roughness.},
doi = {10.1063/1.4980002},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 4,
volume = 24,
place = {United States},
year = {2017},
month = {4}
}

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