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Title: Betatron x-ray radiation from laser-plasma accelerators driven by femtosecond and picosecond laser systems

Abstract

A comparative experimental study of betatron x-ray radiation from laser wakefield acceleration in the blowout and self-modulated regimes is presented. Our experiments use picosecond duration laser pulses up to 150 J (self-modulated regime) and 60 fs duration laser pulses up to 10 J (blowout regime), for plasmas with electronic densities on the order of 1019 cm–3. In the self-modulated regime, where betatron radiation has been very little studied compared to the blowout regime, electrons accelerated in the wake of the laser pulse are subject to both the longitudinal plasma and transverse laser electrical fields. As a result, their motion within the wake is relatively complex; consequently, the experimental and theoretical properties of the x-ray source based on self-modulation differ from the blowout regime of laser wakefield acceleration. In our experimental configuration, electrons accelerated up to about 250 MeV and betatron x-ray spectra with critical energies of about 10–20 keV and photon fluxes between 108 and 1010 photons/eV Sr are reported. In conclusion, our experiments open the prospect of using betatron x-ray radiation for applications, and the source is competitive with current x-ray backlighting methods on multi-kilojoule laser systems.

Authors:
 [1];  [2]; ORCiD logo [3];  [4];  [1]; ORCiD logo [1];  [5]; ORCiD logo [6];  [7];  [1];  [1]; ORCiD logo [8]; ORCiD logo [9];  [6]; ORCiD logo [5];  [1];  [7]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of California, Los Angeles, CA (United States)
  3. Univ. of California, Los Angeles, CA (United States); Univ. of Rochester, Rochester, NY (United States). Lab. for Laser Energetics
  4. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of Texas, Austin, TX (United States)
  5. SLAC National Accelerator Lab., Stanford, CA (United States)
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
  7. Univ. of California, Los Angeles, CA (United States)
  8. Univ. de Lisboa, Lisbon (Portugal); Chalmers Univ. of Technology, Goteborg (Sweden)
  9. Univ. of California, Los Angeles, CA (United States); Univ. de Lisboa, Lisbon (Portugal); Stony Brook Univ., Stony Brook, NY (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1458731
Alternate Identifier(s):
OSTI ID: 1439758
Grant/Contract Number:  
AC02-76SF00515; AC02-05CH11231; AC52-07NA27344; NA0002950; SCW1575-1; 13-LW-076; 16-ERD-024
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 5; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Albert, F., Lemos, N., Shaw, J. L., King, P. M., Pollock, B. B., Goyon, C., Schumaker, W., Saunders, A. M., Marsh, K. A., Pak, A., Ralph, J. E., Martins, J. L., Amorim, L. D., Falcone, R. W., Glenzer, S. H., Moody, J. D., and Joshi, C. Betatron x-ray radiation from laser-plasma accelerators driven by femtosecond and picosecond laser systems. United States: N. p., 2018. Web. doi:10.1063/1.5020997.
Albert, F., Lemos, N., Shaw, J. L., King, P. M., Pollock, B. B., Goyon, C., Schumaker, W., Saunders, A. M., Marsh, K. A., Pak, A., Ralph, J. E., Martins, J. L., Amorim, L. D., Falcone, R. W., Glenzer, S. H., Moody, J. D., & Joshi, C. Betatron x-ray radiation from laser-plasma accelerators driven by femtosecond and picosecond laser systems. United States. doi:10.1063/1.5020997.
Albert, F., Lemos, N., Shaw, J. L., King, P. M., Pollock, B. B., Goyon, C., Schumaker, W., Saunders, A. M., Marsh, K. A., Pak, A., Ralph, J. E., Martins, J. L., Amorim, L. D., Falcone, R. W., Glenzer, S. H., Moody, J. D., and Joshi, C. Thu . "Betatron x-ray radiation from laser-plasma accelerators driven by femtosecond and picosecond laser systems". United States. doi:10.1063/1.5020997. https://www.osti.gov/servlets/purl/1458731.
@article{osti_1458731,
title = {Betatron x-ray radiation from laser-plasma accelerators driven by femtosecond and picosecond laser systems},
author = {Albert, F. and Lemos, N. and Shaw, J. L. and King, P. M. and Pollock, B. B. and Goyon, C. and Schumaker, W. and Saunders, A. M. and Marsh, K. A. and Pak, A. and Ralph, J. E. and Martins, J. L. and Amorim, L. D. and Falcone, R. W. and Glenzer, S. H. and Moody, J. D. and Joshi, C.},
abstractNote = {A comparative experimental study of betatron x-ray radiation from laser wakefield acceleration in the blowout and self-modulated regimes is presented. Our experiments use picosecond duration laser pulses up to 150 J (self-modulated regime) and 60 fs duration laser pulses up to 10 J (blowout regime), for plasmas with electronic densities on the order of 1019 cm–3. In the self-modulated regime, where betatron radiation has been very little studied compared to the blowout regime, electrons accelerated in the wake of the laser pulse are subject to both the longitudinal plasma and transverse laser electrical fields. As a result, their motion within the wake is relatively complex; consequently, the experimental and theoretical properties of the x-ray source based on self-modulation differ from the blowout regime of laser wakefield acceleration. In our experimental configuration, electrons accelerated up to about 250 MeV and betatron x-ray spectra with critical energies of about 10–20 keV and photon fluxes between 108 and 1010 photons/eV Sr are reported. In conclusion, our experiments open the prospect of using betatron x-ray radiation for applications, and the source is competitive with current x-ray backlighting methods on multi-kilojoule laser systems.},
doi = {10.1063/1.5020997},
journal = {Physics of Plasmas},
number = 5,
volume = 25,
place = {United States},
year = {2018},
month = {5}
}

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Figures / Tables:

FIG. 1 FIG. 1: (a) Blowout regime of LFWA, where the laser pulse length is ~half a plasma period; (b) self-modulated regime of LWFA, where the laser pulse length overlaps several plasma periods; (c)–(e) evolution of the laser pulse envelope (red) and the plasma wave amplitude (blue) in the self-modulated regime.

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      Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.