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Title: Performance of indirectly driven capsule implosions on the National Ignition Facility using adiabat-shaping

Abstract

A series of indirectly driven capsule implosions has been performed on the National Ignition Facility to assess the relative contributions of ablation-front instability growth vs. fuel compression on implosion performance. Laser pulse shapes for both low and high-foot pulses were modified to vary ablation-front growth and fuel adiabat, separately and controllably. Three principal conclusions are drawn from this study: (1) It is shown that reducing ablation-front instability growth in low-foot implosions results in a substantial (3-10X) increase in neutron yield with no loss of fuel compression. (2) It is shown that reducing the fuel adiabat in high-foot implosions results in a significant (36%) increase in fuel compression together with a small (10%) increase in neutron yield. (3) Increased electron preheat at higher laser power in high-foot implosions, however, appears to offset the gain in compression achieved by adiabat-shaping at lower power. These results taken collectively bridge the space between the higher compression low-foot results and the higher yield high-foot results.

Authors:
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  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. General Atomics, San Diego, CA (United States)
  3. Univ. of Rochester, NY (United States). Lab. for Laser Energetics
  4. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
Publication Date:
Research Org.:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1259782
Alternate Identifier(s):
OSTI ID: 1420669
Report Number(s):
LLNL-PROC-680487
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: 23; Journal Issue: 5; Conference: Presented at: International Fusion Sciences and Applications 2015, Seattle, WA, United States, Sep 20 - Sep 25, 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; neutrons; holraum; gold; radiosurgery; backscattering

Citation Formats

Robey, H. F., Smalyuk, V. A., Milovich, J. L., Döppner, T., Casey, D. T., Baker, K. L., Peterson, J. L., Bachmann, B., Berzak Hopkins, L. F., Bond, E., Caggiano, J. A., Callahan, D. A., Celliers, P. M., Cerjan, C., Clark, D. S., Dixit, S. N., Edwards, M. J., Gharibyan, N., Haan, S. W., Hammel, B. A., Hamza, A. V., Hatarik, R., Hurricane, O. A., Jancaitis, K. S., Jones, O. S., Kerbel, G. D., Kroll, J. J., Lafortune, K. N., Landen, O. L., Ma, T., Marinak, M. M., MacGowan, B. J., MacPhee, A. G., Pak, A., Patel, M., Patel, P. K., Perkins, L. J., Sayre, D. B., Sepke, S. M., Spears, B. K., Tommasini, R., Weber, C. R., Widmayer, C. C., Yeamans, C., Giraldez, E., Hoover, D., Nikroo, A., Hohenberger, M., and Gatu Johnson, M. Performance of indirectly driven capsule implosions on the National Ignition Facility using adiabat-shaping. United States: N. p., 2016. Web. doi:10.1063/1.4944821.
Robey, H. F., Smalyuk, V. A., Milovich, J. L., Döppner, T., Casey, D. T., Baker, K. L., Peterson, J. L., Bachmann, B., Berzak Hopkins, L. F., Bond, E., Caggiano, J. A., Callahan, D. A., Celliers, P. M., Cerjan, C., Clark, D. S., Dixit, S. N., Edwards, M. J., Gharibyan, N., Haan, S. W., Hammel, B. A., Hamza, A. V., Hatarik, R., Hurricane, O. A., Jancaitis, K. S., Jones, O. S., Kerbel, G. D., Kroll, J. J., Lafortune, K. N., Landen, O. L., Ma, T., Marinak, M. M., MacGowan, B. J., MacPhee, A. G., Pak, A., Patel, M., Patel, P. K., Perkins, L. J., Sayre, D. B., Sepke, S. M., Spears, B. K., Tommasini, R., Weber, C. R., Widmayer, C. C., Yeamans, C., Giraldez, E., Hoover, D., Nikroo, A., Hohenberger, M., & Gatu Johnson, M. Performance of indirectly driven capsule implosions on the National Ignition Facility using adiabat-shaping. United States. https://doi.org/10.1063/1.4944821
Robey, H. F., Smalyuk, V. A., Milovich, J. L., Döppner, T., Casey, D. T., Baker, K. L., Peterson, J. L., Bachmann, B., Berzak Hopkins, L. F., Bond, E., Caggiano, J. A., Callahan, D. A., Celliers, P. M., Cerjan, C., Clark, D. S., Dixit, S. N., Edwards, M. J., Gharibyan, N., Haan, S. W., Hammel, B. A., Hamza, A. V., Hatarik, R., Hurricane, O. A., Jancaitis, K. S., Jones, O. S., Kerbel, G. D., Kroll, J. J., Lafortune, K. N., Landen, O. L., Ma, T., Marinak, M. M., MacGowan, B. J., MacPhee, A. G., Pak, A., Patel, M., Patel, P. K., Perkins, L. J., Sayre, D. B., Sepke, S. M., Spears, B. K., Tommasini, R., Weber, C. R., Widmayer, C. C., Yeamans, C., Giraldez, E., Hoover, D., Nikroo, A., Hohenberger, M., and Gatu Johnson, M. 2016. "Performance of indirectly driven capsule implosions on the National Ignition Facility using adiabat-shaping". United States. https://doi.org/10.1063/1.4944821. https://www.osti.gov/servlets/purl/1259782.
@article{osti_1259782,
title = {Performance of indirectly driven capsule implosions on the National Ignition Facility using adiabat-shaping},
author = {Robey, H. F. and Smalyuk, V. A. and Milovich, J. L. and Döppner, T. and Casey, D. T. and Baker, K. L. and Peterson, J. L. and Bachmann, B. and Berzak Hopkins, L. F. and Bond, E. and Caggiano, J. A. and Callahan, D. A. and Celliers, P. M. and Cerjan, C. and Clark, D. S. and Dixit, S. N. and Edwards, M. J. and Gharibyan, N. and Haan, S. W. and Hammel, B. A. and Hamza, A. V. and Hatarik, R. and Hurricane, O. A. and Jancaitis, K. S. and Jones, O. S. and Kerbel, G. D. and Kroll, J. J. and Lafortune, K. N. and Landen, O. L. and Ma, T. and Marinak, M. M. and MacGowan, B. J. and MacPhee, A. G. and Pak, A. and Patel, M. and Patel, P. K. and Perkins, L. J. and Sayre, D. B. and Sepke, S. M. and Spears, B. K. and Tommasini, R. and Weber, C. R. and Widmayer, C. C. and Yeamans, C. and Giraldez, E. and Hoover, D. and Nikroo, A. and Hohenberger, M. and Gatu Johnson, M.},
abstractNote = {A series of indirectly driven capsule implosions has been performed on the National Ignition Facility to assess the relative contributions of ablation-front instability growth vs. fuel compression on implosion performance. Laser pulse shapes for both low and high-foot pulses were modified to vary ablation-front growth and fuel adiabat, separately and controllably. Three principal conclusions are drawn from this study: (1) It is shown that reducing ablation-front instability growth in low-foot implosions results in a substantial (3-10X) increase in neutron yield with no loss of fuel compression. (2) It is shown that reducing the fuel adiabat in high-foot implosions results in a significant (36%) increase in fuel compression together with a small (10%) increase in neutron yield. (3) Increased electron preheat at higher laser power in high-foot implosions, however, appears to offset the gain in compression achieved by adiabat-shaping at lower power. These results taken collectively bridge the space between the higher compression low-foot results and the higher yield high-foot results.},
doi = {10.1063/1.4944821},
url = {https://www.osti.gov/biblio/1259782}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 5,
volume = 23,
place = {United States},
year = {Fri Apr 01 00:00:00 EDT 2016},
month = {Fri Apr 01 00:00:00 EDT 2016}
}

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