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

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 & fuel adiabat, separately and controllably. Two principal conclusions are drawn from this study: 1) It is shown that an increase in laser picket energy reduces ablation-front instability growth in low-foot implosions resulting in a substantial (3-10X) increase in neutron yield with no loss of fuel compression. 2.) It is shown that a decrease in laser trough power reduces the fuel adiabat in high-foot implosions results in a significant (36%) increase in fuel compression together with no reduction in neutron yield. 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:
Report Number(s):
LLNL-PROC-680487
Journal ID: ISSN 1070-664X
Grant/Contract Number:
AC52-07NA27344
Type:
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)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; neutrons; holraum; gold; radiosurgery; backscattering
OSTI Identifier:
1259782
Alternate Identifier(s):
OSTI ID: 1420669

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., 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. 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., and Gatu Johnson, M.. 2016. "Performance of indirectly driven capsule implosions on the National Ignition Facility using adiabat-shaping". United States. doi: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 & fuel adiabat, separately and controllably. Two principal conclusions are drawn from this study: 1) It is shown that an increase in laser picket energy reduces ablation-front instability growth in low-foot implosions resulting in a substantial (3-10X) increase in neutron yield with no loss of fuel compression. 2.) It is shown that a decrease in laser trough power reduces the fuel adiabat in high-foot implosions results in a significant (36%) increase in fuel compression together with no reduction in neutron yield. 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},
journal = {Physics of Plasmas},
number = 5,
volume = 23,
place = {United States},
year = {2016},
month = {4}
}

Works referenced in this record:

Direct-drive laser fusion: Status and prospects
journal, May 1998
  • Bodner, Stephen E.; Colombant, Denis G.; Gardner, John H.
  • Physics of Plasmas, Vol. 5, Issue 5, p. 1901-1918
  • DOI: 10.1063/1.872861