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Title: Impact of pre-plasma on fast electron generation and transport from short pulse, high intensity lasers

Abstract

Previous experiments and modeling examining the impact of an underdense, pre-formed plasma in laser-plasma interactions have shown that the fast electrons are generated with energies higher than predicted by ponderomotive scaling. In this paper, we report on experiments using the Texas Petawatt high intensity (150 fs, 1.5 × 1020 W cm-2) laser pulse, which were conducted to examine the mechanism for accelerating these high energy electrons. These experiments gauge the impact a controlled low density pre-formed plasma has on electron generation with a shorter time scale than previous experiments, 150–180 fs. Electron temperatures measured via magnetic spectrometer on experiment were found to be independent of preformed plasma. Supplemental computational results using 1D PIC simulations predict that super-ponderomotive electrons are generated inside a potential well in the pre-plasma. Finally, however, while the potential well is established around 150 fs, the electrons require at least an additional 50 fs to be trapped and heated inside it.

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [3];  [3];  [3];  [4];  [4];  [4];  [4];  [4];  [4];  [4];  [4];  [1];  [1]
+ Show Author Affiliations
  1. Univ. of California, San Diego, CA (United States). Center for Energy Research
  2. General Atomics, San Diego, CA (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. Univ. of Texas, Austin, TX (United States). Physics Dept.
Publication Date:
Research Org.:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Univ. of California, San Diego, CA (United States); Univ. of Texas, Austin, TX (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
OSTI Identifier:
1458693
Alternate Identifier(s):
OSTI ID: 1238833
Report Number(s):
LLNL-JRNL-737084
Journal ID: ISSN 0029-5515; 888284; TRN: US1901509
Grant/Contract Number:  
AC52-07NA27344; NA0001858
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 56; Journal Issue: 1; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; laser plasma interaction; inertial confinement fusion; pre-plasma

Citation Formats

Peebles, J., McGuffey, C., Krauland, C. M., Jarrott, L. C., Sorokovikova, A., Wei, M. S., Park, J., Chen, H., McLean, H. S., Wagner, C., Spinks, M., Gaul, E. W., Dyer, G., Hegelich, B. M., Martinez, M., Donovan, M., Ditmire, T., Krasheninnikov, S. I., and Beg, F. N. Impact of pre-plasma on fast electron generation and transport from short pulse, high intensity lasers. United States: N. p., 2015. Web. doi:10.1088/0029-5515/56/1/016007.
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Peebles, J., McGuffey, C., Krauland, C. M., Jarrott, L. C., Sorokovikova, A., Wei, M. S., Park, J., Chen, H., McLean, H. S., Wagner, C., Spinks, M., Gaul, E. W., Dyer, G., Hegelich, B. M., Martinez, M., Donovan, M., Ditmire, T., Krasheninnikov, S. I., & Beg, F. N. Impact of pre-plasma on fast electron generation and transport from short pulse, high intensity lasers. United States. https://doi.org/10.1088/0029-5515/56/1/016007
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Peebles, J., McGuffey, C., Krauland, C. M., Jarrott, L. C., Sorokovikova, A., Wei, M. S., Park, J., Chen, H., McLean, H. S., Wagner, C., Spinks, M., Gaul, E. W., Dyer, G., Hegelich, B. M., Martinez, M., Donovan, M., Ditmire, T., Krasheninnikov, S. I., and Beg, F. N. Wed . "Impact of pre-plasma on fast electron generation and transport from short pulse, high intensity lasers". United States. https://doi.org/10.1088/0029-5515/56/1/016007. https://www.osti.gov/servlets/purl/1458693.
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@article{osti_1458693,
title = {Impact of pre-plasma on fast electron generation and transport from short pulse, high intensity lasers},
author = {Peebles, J. and McGuffey, C. and Krauland, C. M. and Jarrott, L. C. and Sorokovikova, A. and Wei, M. S. and Park, J. and Chen, H. and McLean, H. S. and Wagner, C. and Spinks, M. and Gaul, E. W. and Dyer, G. and Hegelich, B. M. and Martinez, M. and Donovan, M. and Ditmire, T. and Krasheninnikov, S. I. and Beg, F. N.},
abstractNote = {Previous experiments and modeling examining the impact of an underdense, pre-formed plasma in laser-plasma interactions have shown that the fast electrons are generated with energies higher than predicted by ponderomotive scaling. In this paper, we report on experiments using the Texas Petawatt high intensity (150 fs, 1.5 × 1020 W cm-2) laser pulse, which were conducted to examine the mechanism for accelerating these high energy electrons. These experiments gauge the impact a controlled low density pre-formed plasma has on electron generation with a shorter time scale than previous experiments, 150–180 fs. Electron temperatures measured via magnetic spectrometer on experiment were found to be independent of preformed plasma. Supplemental computational results using 1D PIC simulations predict that super-ponderomotive electrons are generated inside a potential well in the pre-plasma. Finally, however, while the potential well is established around 150 fs, the electrons require at least an additional 50 fs to be trapped and heated inside it.},
doi = {10.1088/0029-5515/56/1/016007},
journal = {Nuclear Fusion},
number = 1,
volume = 56,
place = {United States},
year = {Wed Dec 02 00:00:00 EST 2015},
month = {Wed Dec 02 00:00:00 EST 2015}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1088/0029-5515/56/1/016007
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Cited by: 4 works
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Figures / Tables:

FIG. 1 FIG. 1: (a) Diagram of experimental setup on TPW; a short pulse laser drives the interaction (red) while a controlled coincident long pulse beam (green) generates a simulated pre-plasma. (b) Setup of Cu-Kα imaging system. A tungsten beam block shields direct x-ray radiation while the crystal reflects 8.06 keV x-raysmore » to an image plate across the chamber.« less
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    Works referencing / citing this record:

    Beyond the ponderomotive limit: Direct laser acceleration of relativistic electrons in sub-critical plasmas
    journal, April 2016

    • Arefiev, A. V.; Khudik, V. N.; Robinson, A. P. L.
    • Physics of Plasmas, Vol. 23, Issue 5
    • DOI: 10.1063/1.4946024

    Enhanced proton acceleration in an applied longitudinal magnetic field
    journal, October 2016

    High-angle deflection of the energetic electrons by a voluminous magnetic structure in near-normal intense laser-plasma interactions
    journal, November 2018

    Enhanced proton acceleration in an applied longitudinal magnetic field
    text, January 2016

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