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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); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1332478
Alternate Identifier(s):
OSTI ID: 1258645
Report Number(s):
LLNL-JRNL-697677
Journal ID: ISSN 0741-3335
Grant/Contract Number:  
NA0002950; AC52-07NA27344
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; 42 ENGINEERING; particle-in-cell codes; laser-plasma interaction

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/1332478.
@article{osti_1332478,
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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