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

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 10 19 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 10 8 and 10 10 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:
Grant/Contract Number:
AC02-76SF00515; AC02-05CH11231; AC52-07NA27344; NA0002950; SCW1575-1; 13-LW-076; 16-ERD-024
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)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1458731
Alternate Identifier(s):
OSTI ID: 1439758