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Title: Self-modulated laser wakefield accelerators as x-ray sources

Abstract

The development of a directional, small-divergence, and short-duration picosecond x-ray probe beam with an energy greater than 50 keV is desirable for high energy density science experiments. We therefore explore through particle-in-cell (PIC) computer simulations the possibility of using x-rays radiated by betatron-like motion of electrons from a self-modulated laser wakefield accelerator as a possible candidate to meet this need. Two OSIRIS 2D PIC simulations with mobile ions are presented, one with a normalized vector potential a0 = 1.5 and the other with an a0 = 3. We find that in both cases direct laser acceleration (DLA) is an important additional acceleration mechanism in addition to the longitudinal electric field of the plasma wave. Together these mechanisms produce electrons with a continuous energy spectrum with a maximum energy of 300 MeV for a0 = 3 case and 180 MeV in the a0 = 1.5 case. Forward-directed x-ray radiation with a photon energy up to 100 keV was calculated for the a0 = 3 case and up to 12 keV for the a0 = 1.5 case. The x-ray spectrum can be fitted with a sum of two synchrotron spectra with critical photon energies of 13 and 45 keV for the a0more » of 3 and critical photon energies of 0.3 and 1.4 keV for a0 of 1.5 in the plane of polarization of the laser. The full width at half maximum divergence angle of the x-rays was 62 × 1.9 mrad for a0 =3and77×3.8mradfora0 =1.5.« less

Authors:
 [1];  [2];  [1];  [1];  [1];  [3];  [3];  [1]
  1. Univ. of California, Los Angeles, CA (United States)
  2. Inst. of Superior Tecnico (IST), Lisbon (Portugal).
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Univ. of California, Los Angeles, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1258645
Grant/Contract Number:  
NA0002950
Resource Type:
Accepted Manuscript
Journal Name:
Plasma Physics and Controlled Fusion
Additional Journal Information:
Journal Volume: 58; Journal Issue: 3; Journal ID: ISSN 0741-3335
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; betatron radiation; laser wakefield acceleration; direct laser acceleration; particle- in-cell codes; laser–plasma interaction; self-modulation instability; Raman forward scattering

Citation Formats

Lemos, Nuno, Martins, J. L., Tsung, Frank, Shaw, Jessica, Marsh, Kenneth, Albert, Felicie, Pollock, B. B., and Joshi, Chan. Self-modulated laser wakefield accelerators as x-ray sources. United States: N. p., 2016. Web. doi:10.1088/0741-3335/58/3/034018.
Lemos, Nuno, Martins, J. L., Tsung, Frank, Shaw, Jessica, Marsh, Kenneth, Albert, Felicie, Pollock, B. B., & Joshi, Chan. Self-modulated laser wakefield accelerators as x-ray sources. United States. doi:10.1088/0741-3335/58/3/034018.
Lemos, Nuno, Martins, J. L., Tsung, Frank, Shaw, Jessica, Marsh, Kenneth, Albert, Felicie, Pollock, B. B., and Joshi, Chan. Wed . "Self-modulated laser wakefield accelerators as x-ray sources". United States. doi:10.1088/0741-3335/58/3/034018. https://www.osti.gov/servlets/purl/1258645.
@article{osti_1258645,
title = {Self-modulated laser wakefield accelerators as x-ray sources},
author = {Lemos, Nuno and Martins, J. L. and Tsung, Frank and Shaw, Jessica and Marsh, Kenneth and Albert, Felicie and Pollock, B. B. and Joshi, Chan},
abstractNote = {The development of a directional, small-divergence, and short-duration picosecond x-ray probe beam with an energy greater than 50 keV is desirable for high energy density science experiments. We therefore explore through particle-in-cell (PIC) computer simulations the possibility of using x-rays radiated by betatron-like motion of electrons from a self-modulated laser wakefield accelerator as a possible candidate to meet this need. Two OSIRIS 2D PIC simulations with mobile ions are presented, one with a normalized vector potential a0 = 1.5 and the other with an a0 = 3. We find that in both cases direct laser acceleration (DLA) is an important additional acceleration mechanism in addition to the longitudinal electric field of the plasma wave. Together these mechanisms produce electrons with a continuous energy spectrum with a maximum energy of 300 MeV for a0 = 3 case and 180 MeV in the a0 = 1.5 case. Forward-directed x-ray radiation with a photon energy up to 100 keV was calculated for the a0 = 3 case and up to 12 keV for the a0 = 1.5 case. The x-ray spectrum can be fitted with a sum of two synchrotron spectra with critical photon energies of 13 and 45 keV for the a0 of 3 and critical photon energies of 0.3 and 1.4 keV for a0 of 1.5 in the plane of polarization of the laser. The full width at half maximum divergence angle of the x-rays was 62 × 1.9 mrad for a0 =3and77×3.8mradfora0 =1.5.},
doi = {10.1088/0741-3335/58/3/034018},
journal = {Plasma Physics and Controlled Fusion},
number = 3,
volume = 58,
place = {United States},
year = {2016},
month = {2}
}

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Cited by: 7 works
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Figures / Tables:

Figure 1 Figure 1: Layout of the 2D PIC simulation in the speed-of-light frame within a box that was 500 x 150 μm with 30000 x 1024 cells. The laser had an a0 = 1.5 or 3 and was focused 100 μm into the 200 μm density up-ramp in a region ofmore » fully-ionized He plasma. The density ramp was followed by a 3000 μm constant density region ending in a 200 μm density down ramp.« less

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    Works referencing / citing this record:

    Effects of laser polarization and wavelength on hybrid laser wakefield and direct acceleration
    journal, August 2018

    • Zhang, Xi; Wang, T.; Khudik, V. N.
    • Plasma Physics and Controlled Fusion, Vol. 60, Issue 10
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