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Title: Reduced fast electron transport in shock-heated plasma in multilayer targets due to self-generated magnetic fields

Abstract

Fast electron transport has been studied in cold solid density CH, cold CH foam (200 mg / cm 3), and CH plasma (40 eV 30 mg/cm 3) targets—the latter created by shocking the CH foam with a 1.2 kJ long pulse laser and allowing it to expand. The fast electrons were produced using the OMEGA EP laser pulse (800 J, 8 ps) incident on a Au flat target. With the CH plasma, the fluence of fast electrons reaching a Cu foil at the far side of the transport was reduced significantly (25 × weaker peak K $α$ emission). Particle-in-cell simulations using the osiris code modeled fast electron transport in the unshocked foam and plasma cases assuming fixed ionization and including source generation, transport in Au and CH layers, Coulomb collisions, and refluxing. Simulations indicate two main mechanisms which alter electron energy transport through the target between the foam and plasma cases, both due to the magnetic field: a collimating field in the CH region, caused by the resistivity of the return current and more prevalent in the foam; and an insulating field at the Au-CH interface, present only with the plasma.

Authors:
 [1];  [2];  [1];  [1];  [3];  [3];  [4];  [2];  [5];  [5];  [1]
  1. Univ. of California, San Diego, CA (United States). Center for Energy Research
  2. Univ. of California, Los Angeles, CA (United States). Dept. of Physics and Astronomy
  3. General Atomics, San Diego, CA (United States)
  4. Univ. of Rochester, NY (United States). Lab. for Laser Energetics
  5. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1513098
Alternate Identifier(s):
OSTI ID: 1471155
Report Number(s):
LLNL-JRNL-771446
Journal ID: ISSN 2470-0045; PLEEE8; 961421
Grant/Contract Number:  
AC52-07NA27344; FG52-09NA29033; FC02-04ER54789; FG02-05ER54834; NA0002953
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review E
Additional Journal Information:
Journal Volume: 98; Journal Issue: 3; Journal ID: ISSN 2470-0045
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

McGuffey, C., May, J., Yabuuchi, T., Sawada, H., Wei, M. S., Stephens, R. B., Stoeckl, C., Mori, W. B., McLean, H. S., Patel, P. K., and Beg, F. N. Reduced fast electron transport in shock-heated plasma in multilayer targets due to self-generated magnetic fields. United States: N. p., 2018. Web. doi:10.1103/PhysRevE.98.033208.
McGuffey, C., May, J., Yabuuchi, T., Sawada, H., Wei, M. S., Stephens, R. B., Stoeckl, C., Mori, W. B., McLean, H. S., Patel, P. K., & Beg, F. N. Reduced fast electron transport in shock-heated plasma in multilayer targets due to self-generated magnetic fields. United States. doi:10.1103/PhysRevE.98.033208.
McGuffey, C., May, J., Yabuuchi, T., Sawada, H., Wei, M. S., Stephens, R. B., Stoeckl, C., Mori, W. B., McLean, H. S., Patel, P. K., and Beg, F. N. Mon . "Reduced fast electron transport in shock-heated plasma in multilayer targets due to self-generated magnetic fields". United States. doi:10.1103/PhysRevE.98.033208. https://www.osti.gov/servlets/purl/1513098.
@article{osti_1513098,
title = {Reduced fast electron transport in shock-heated plasma in multilayer targets due to self-generated magnetic fields},
author = {McGuffey, C. and May, J. and Yabuuchi, T. and Sawada, H. and Wei, M. S. and Stephens, R. B. and Stoeckl, C. and Mori, W. B. and McLean, H. S. and Patel, P. K. and Beg, F. N.},
abstractNote = {Fast electron transport has been studied in cold solid density CH, cold CH foam (200 mg / cm3), and CH plasma (40 eV 30 mg/cm3) targets—the latter created by shocking the CH foam with a 1.2 kJ long pulse laser and allowing it to expand. The fast electrons were produced using the OMEGA EP laser pulse (800 J, 8 ps) incident on a Au flat target. With the CH plasma, the fluence of fast electrons reaching a Cu foil at the far side of the transport was reduced significantly (25 × weaker peak K $α$ emission). Particle-in-cell simulations using the osiris code modeled fast electron transport in the unshocked foam and plasma cases assuming fixed ionization and including source generation, transport in Au and CH layers, Coulomb collisions, and refluxing. Simulations indicate two main mechanisms which alter electron energy transport through the target between the foam and plasma cases, both due to the magnetic field: a collimating field in the CH region, caused by the resistivity of the return current and more prevalent in the foam; and an insulating field at the Au-CH interface, present only with the plasma.},
doi = {10.1103/PhysRevE.98.033208},
journal = {Physical Review E},
number = 3,
volume = 98,
place = {United States},
year = {2018},
month = {9}
}

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