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Title: High-angle deflection of the energetic electrons by a voluminous magnetic structure in near-normal intense laser-plasma interactions

The physics governing electron acceleration by a relativistically intense laser is not confined to the critical density surface; it also pervades the subcritical plasma in front of the target. Here particles can gain many times the ponderomotive energy from the overlying laser and strong fields can grow. Experiments using a high-contrast laser and a prescribed laser prepulse demonstrate that development of the preplasma has an unexpectedly strong effect on the most energetic, superponderomotive electrons. The presented two-dimensional particle-in-cell simulations reveal how strong, voluminous magnetic structures that evolve in the preplasma impact high-energy electrons more significantly than low-energy ones for longer pulse durations and how the common practice of tilting the target to a modest incidence angle can be enough to initiate strong deflection. In conclusion, the implications are that multiple angular spectral measurements are necessary to prevent misleading conclusions from past and future experiments.
Authors:
 [1] ;  [2] ;  [3] ;  [3] ;  [4] ;  [4] ;  [4] ;  [5] ;  [4] ;  [4] ;  [4] ;  [6] ;  [6] ;  [6] ;  [7] ;  [3] ;  [3]
  1. Univ. of California, San Diego, La Jolla, CA (United States); Univ. of Rochester, Rochester, NY (United States)
  2. Univ. of California, San Diego, La Jolla, CA (United States); Univ. of Texas, Austin, TX (United States)
  3. Univ. of California, San Diego, La Jolla, CA (United States)
  4. Univ. of Texas, Austin, TX (United States)
  5. Univ. of Texas, Austin, TX (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  6. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  7. General Atomics, San Diego, CA (United States)
Publication Date:
Grant/Contract Number:
AC02-76SF00515; NA0001858; EP/G054940/1; EP/G055165/1; EP/G056803/1; NA0002008
Type:
Accepted Manuscript
Journal Name:
Physical Review E
Additional Journal Information:
Journal Volume: 98; Journal Issue: 5; Journal ID: ISSN 2470-0045
Publisher:
American Physical Society (APS)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1490076
Alternate Identifier(s):
OSTI ID: 1481228

Peebles, J., Arefiev, A. V., Zhang, S., McGuffey, C., Spinks, M., Gordon, J., Gaul, E. W., Dyer, G., Martinez, M., Donovan, M. E., Ditmire, T., Park, J., Chen, H., McLean, H. S., Wei, M. S., Krasheninnikov, S. I., and Beg, F. N.. High-angle deflection of the energetic electrons by a voluminous magnetic structure in near-normal intense laser-plasma interactions. United States: N. p., Web. doi:10.1103/physreve.98.053202.
Peebles, J., Arefiev, A. V., Zhang, S., McGuffey, C., Spinks, M., Gordon, J., Gaul, E. W., Dyer, G., Martinez, M., Donovan, M. E., Ditmire, T., Park, J., Chen, H., McLean, H. S., Wei, M. S., Krasheninnikov, S. I., & Beg, F. N.. High-angle deflection of the energetic electrons by a voluminous magnetic structure in near-normal intense laser-plasma interactions. United States. doi:10.1103/physreve.98.053202.
Peebles, J., Arefiev, A. V., Zhang, S., McGuffey, C., Spinks, M., Gordon, J., Gaul, E. W., Dyer, G., Martinez, M., Donovan, M. E., Ditmire, T., Park, J., Chen, H., McLean, H. S., Wei, M. S., Krasheninnikov, S. I., and Beg, F. N.. 2018. "High-angle deflection of the energetic electrons by a voluminous magnetic structure in near-normal intense laser-plasma interactions". United States. doi:10.1103/physreve.98.053202.
@article{osti_1490076,
title = {High-angle deflection of the energetic electrons by a voluminous magnetic structure in near-normal intense laser-plasma interactions},
author = {Peebles, J. and Arefiev, A. V. and Zhang, S. and McGuffey, C. and Spinks, M. and Gordon, J. and Gaul, E. W. and Dyer, G. and Martinez, M. and Donovan, M. E. and Ditmire, T. and Park, J. and Chen, H. and McLean, H. S. and Wei, M. S. and Krasheninnikov, S. I. and Beg, F. N.},
abstractNote = {The physics governing electron acceleration by a relativistically intense laser is not confined to the critical density surface; it also pervades the subcritical plasma in front of the target. Here particles can gain many times the ponderomotive energy from the overlying laser and strong fields can grow. Experiments using a high-contrast laser and a prescribed laser prepulse demonstrate that development of the preplasma has an unexpectedly strong effect on the most energetic, superponderomotive electrons. The presented two-dimensional particle-in-cell simulations reveal how strong, voluminous magnetic structures that evolve in the preplasma impact high-energy electrons more significantly than low-energy ones for longer pulse durations and how the common practice of tilting the target to a modest incidence angle can be enough to initiate strong deflection. In conclusion, the implications are that multiple angular spectral measurements are necessary to prevent misleading conclusions from past and future experiments.},
doi = {10.1103/physreve.98.053202},
journal = {Physical Review E},
number = 5,
volume = 98,
place = {United States},
year = {2018},
month = {11}
}

Works referenced in this record:

Ignition and high gain with ultrapowerful lasers
journal, May 1994
  • Tabak, Max; Hammer, James; Glinsky, Michael E.
  • Physics of Plasmas, Vol. 1, Issue 5, p. 1626-1634
  • DOI: 10.1063/1.870664