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Title: Enhanced hot-electron production and strong-shock generation in hydrogen-rich ablators for shock ignition

Abstract

Experiments were performed with CH, Be, C, and SiO 2 ablators interacting with high-intensity UV laser radiation (5 × 10 15 W/cm 2, λ = 351 nm) to determine the optimum material for hot-electron production and strong-shock generation. Significantly more hot electrons are produced in CH (up to ~13% instantaneous conversion efficiency), while the amount is a factor of ~2 to 3 lower in the other ablators. A larger hot-electron fraction is correlated with a higher effective ablation pressure. As a result, the higher conversion efficiency in CH is attributed to stronger damping of ion-acoustic waves because of the presence of light H ions.

Authors:
 [1]; ORCiD logo [1];  [2];  [1];  [3];  [1];  [1];  [1];  [1];  [4]; ORCiD logo [1];  [1]; ORCiD logo [5]; ORCiD logo [6]; ORCiD logo [1];  [7];  [8];  [8];  [8]; ORCiD logo [8] more »;  [9] « less
  1. Univ. of Rochester, Rochester, NY (United States)
  2. Univ. of Rochester, Rochester, NY (United States); Univ. of Science and Technology of China, Hefei (People's Republic of China)
  3. Univ. of Rochester, Rochester, NY (United States); CEA, DAM, DIF, Arpajon (France)
  4. Univ. of Rochester, Rochester, NY (United States); Chinese Academy of Engineering Physics, Mianyang (People's Republic of China)
  5. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  6. CEA, DAM, DIF, Arpajon (France); Univ. de Bordeaux CNRS-CEA, Talence (France)
  7. Univ. of California-San Diego, La Jolla, CA (United States)
  8. Univ. de Bordeaux CNRS-CEA, Talence (France)
  9. General Atomics, San Diego, CA (United States)
Publication Date:
Research Org.:
Univ. of Rochester, Rochester, NY (United States). Lab. for Laser Energetics
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1417651
Alternate Identifier(s):
OSTI ID: 1411997
Report Number(s):
2017-62, 1367
Journal ID: ISSN 1070-664X; 2017-62, 2323, 1367; TRN: US1801097
Grant/Contract Number:  
NA0001944; FC02-04ER54789
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 12; 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

Citation Formats

Theobald, W., Bose, A., Yan, R., Betti, R., Lafon, M., Mangino, D., Christopherson, A. R., Stoeckl, C., Seka, W., Shang, W., Michel, D. T., Ren, C., Nora, R. C., Casner, A., Peebles, J., Beg, F. N., Ribeyre, X., Llor Aisa, E., Colaitis, A., Tikhonchuk, V., and Wei, M. S. Enhanced hot-electron production and strong-shock generation in hydrogen-rich ablators for shock ignition. United States: N. p., 2017. Web. doi:10.1063/1.4986797.
Theobald, W., Bose, A., Yan, R., Betti, R., Lafon, M., Mangino, D., Christopherson, A. R., Stoeckl, C., Seka, W., Shang, W., Michel, D. T., Ren, C., Nora, R. C., Casner, A., Peebles, J., Beg, F. N., Ribeyre, X., Llor Aisa, E., Colaitis, A., Tikhonchuk, V., & Wei, M. S. Enhanced hot-electron production and strong-shock generation in hydrogen-rich ablators for shock ignition. United States. doi:10.1063/1.4986797.
Theobald, W., Bose, A., Yan, R., Betti, R., Lafon, M., Mangino, D., Christopherson, A. R., Stoeckl, C., Seka, W., Shang, W., Michel, D. T., Ren, C., Nora, R. C., Casner, A., Peebles, J., Beg, F. N., Ribeyre, X., Llor Aisa, E., Colaitis, A., Tikhonchuk, V., and Wei, M. S. Fri . "Enhanced hot-electron production and strong-shock generation in hydrogen-rich ablators for shock ignition". United States. doi:10.1063/1.4986797. https://www.osti.gov/servlets/purl/1417651.
@article{osti_1417651,
title = {Enhanced hot-electron production and strong-shock generation in hydrogen-rich ablators for shock ignition},
author = {Theobald, W. and Bose, A. and Yan, R. and Betti, R. and Lafon, M. and Mangino, D. and Christopherson, A. R. and Stoeckl, C. and Seka, W. and Shang, W. and Michel, D. T. and Ren, C. and Nora, R. C. and Casner, A. and Peebles, J. and Beg, F. N. and Ribeyre, X. and Llor Aisa, E. and Colaitis, A. and Tikhonchuk, V. and Wei, M. S.},
abstractNote = {Experiments were performed with CH, Be, C, and SiO2 ablators interacting with high-intensity UV laser radiation (5 × 1015 W/cm2, λ = 351 nm) to determine the optimum material for hot-electron production and strong-shock generation. Significantly more hot electrons are produced in CH (up to ~13% instantaneous conversion efficiency), while the amount is a factor of ~2 to 3 lower in the other ablators. A larger hot-electron fraction is correlated with a higher effective ablation pressure. As a result, the higher conversion efficiency in CH is attributed to stronger damping of ion-acoustic waves because of the presence of light H ions.},
doi = {10.1063/1.4986797},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 12,
volume = 24,
place = {United States},
year = {2017},
month = {12}
}

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Works referenced in this record:

Shock Ignition: A New Approach to High Gain Inertial Confinement Fusion on the National Ignition Facility
journal, July 2009


Shock ignition of thermonuclear fuel with high areal densities
journal, May 2008

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