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Title: Hydro-instability growth of perturbation seeds from alternate capsule-support strategies in indirect-drive implosions on National Ignition Facility

Abstract

Hydrodynamic instability growth of the capsule support membranes (or “tents”) and fill tubes has been studied in spherical, glow discharge polymer plastic capsule implosions at the National Ignition Facility (NIF). In NIF implosions, the capsules are supported by tents because the nominal 10-μm thick fill tubes are not strong enough to support capsules by themselves. After it was recognized that the tents had a significant impact of implosion stability, new support methods were investigated, including thicker, 30-μm diameter fill tubes and cantilevered fill tubes, as described in this article. A new “sub-scale” version of the existing x-ray radiography platform was developed for measuring growing capsule perturbations in the acceleration phase of implosions. It was calibrated using hydrodynamic growth measurements of pre-imposed capsule modulations with Legendre modes of 60, 90, 110, and 140 at convergence ratios up to ~2.4. Subsequent experiments with 3-D perturbations have studied instability growth of 10-μm and 30-μm thick fill tubes to compare them with 30-nm thick tent perturbations at convergence ratios up to ~3. In other experiments, the perturbations from cantilevered fill tubes were measured and compared to the tent perturbations. The cantilevered fill tubes were supported by 12-μm thick SiC rods, offset by 100 μm,more » 200 μm, and 300 μm from the capsule surfaces. Based on these experiments, 30-μm thick fill tubes and 300-μm offset cantilevered fill tubes were recommended for further tests using layered deuterium-tritium implosions. In conclusion, the effects of x-ray shadowing during the drive and oxygen-induced perturbations during target assembly produced additional seeds for instabilities and were also measured in these experiments.« less

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1];  [1];  [1];  [1];  [1];  [2]; ORCiD logo [1];  [2]; ORCiD logo [2];  [1];  [1]; ORCiD logo [1];  [1];  [1];  [1];  [1];  [1]; ORCiD logo [1] more »;  [1];  [1];  [2] « less
  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:
1420290
Alternate Identifier(s):
OSTI ID: 1400427
Report Number(s):
LLNL-JRNL-733705
Journal ID: ISSN 1070-664X; TRN: US1801480
Grant/Contract Number:
AC52-07NA27344; NA0001808
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 10; 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

Martinez, D. A., Smalyuk, V. A., MacPhee, A. G., Milovich, J., Casey, D. T., Weber, C. R., Robey, H. F., Chen, K. -C., Clark, D. S., Crippen, J., Farrell, M., Felker, S., Field, J. E., Haan, S. W., Hammel, B. A., Hamza, A. V., Stadermann, M., Hsing, W. W., Kroll, J. J., Landen, O. L., Nikroo, A., Pickworth, L., and Rice, N. Hydro-instability growth of perturbation seeds from alternate capsule-support strategies in indirect-drive implosions on National Ignition Facility. United States: N. p., 2017. Web. doi:10.1063/1.4995568.
Martinez, D. A., Smalyuk, V. A., MacPhee, A. G., Milovich, J., Casey, D. T., Weber, C. R., Robey, H. F., Chen, K. -C., Clark, D. S., Crippen, J., Farrell, M., Felker, S., Field, J. E., Haan, S. W., Hammel, B. A., Hamza, A. V., Stadermann, M., Hsing, W. W., Kroll, J. J., Landen, O. L., Nikroo, A., Pickworth, L., & Rice, N. Hydro-instability growth of perturbation seeds from alternate capsule-support strategies in indirect-drive implosions on National Ignition Facility. United States. doi:10.1063/1.4995568.
Martinez, D. A., Smalyuk, V. A., MacPhee, A. G., Milovich, J., Casey, D. T., Weber, C. R., Robey, H. F., Chen, K. -C., Clark, D. S., Crippen, J., Farrell, M., Felker, S., Field, J. E., Haan, S. W., Hammel, B. A., Hamza, A. V., Stadermann, M., Hsing, W. W., Kroll, J. J., Landen, O. L., Nikroo, A., Pickworth, L., and Rice, N. Fri . "Hydro-instability growth of perturbation seeds from alternate capsule-support strategies in indirect-drive implosions on National Ignition Facility". United States. doi:10.1063/1.4995568.
@article{osti_1420290,
title = {Hydro-instability growth of perturbation seeds from alternate capsule-support strategies in indirect-drive implosions on National Ignition Facility},
author = {Martinez, D. A. and Smalyuk, V. A. and MacPhee, A. G. and Milovich, J. and Casey, D. T. and Weber, C. R. and Robey, H. F. and Chen, K. -C. and Clark, D. S. and Crippen, J. and Farrell, M. and Felker, S. and Field, J. E. and Haan, S. W. and Hammel, B. A. and Hamza, A. V. and Stadermann, M. and Hsing, W. W. and Kroll, J. J. and Landen, O. L. and Nikroo, A. and Pickworth, L. and Rice, N.},
abstractNote = {Hydrodynamic instability growth of the capsule support membranes (or “tents”) and fill tubes has been studied in spherical, glow discharge polymer plastic capsule implosions at the National Ignition Facility (NIF). In NIF implosions, the capsules are supported by tents because the nominal 10-μm thick fill tubes are not strong enough to support capsules by themselves. After it was recognized that the tents had a significant impact of implosion stability, new support methods were investigated, including thicker, 30-μm diameter fill tubes and cantilevered fill tubes, as described in this article. A new “sub-scale” version of the existing x-ray radiography platform was developed for measuring growing capsule perturbations in the acceleration phase of implosions. It was calibrated using hydrodynamic growth measurements of pre-imposed capsule modulations with Legendre modes of 60, 90, 110, and 140 at convergence ratios up to ~2.4. Subsequent experiments with 3-D perturbations have studied instability growth of 10-μm and 30-μm thick fill tubes to compare them with 30-nm thick tent perturbations at convergence ratios up to ~3. In other experiments, the perturbations from cantilevered fill tubes were measured and compared to the tent perturbations. The cantilevered fill tubes were supported by 12-μm thick SiC rods, offset by 100 μm, 200 μm, and 300 μm from the capsule surfaces. Based on these experiments, 30-μm thick fill tubes and 300-μm offset cantilevered fill tubes were recommended for further tests using layered deuterium-tritium implosions. In conclusion, the effects of x-ray shadowing during the drive and oxygen-induced perturbations during target assembly produced additional seeds for instabilities and were also measured in these experiments.},
doi = {10.1063/1.4995568},
journal = {Physics of Plasmas},
number = 10,
volume = 24,
place = {United States},
year = {Fri Oct 20 00:00:00 EDT 2017},
month = {Fri Oct 20 00:00:00 EDT 2017}
}

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