Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering

Variable Energy Gamma (VEGA) System at ELI-NP

The Variable Energy Gamma (VEGA) System is a dedicated system for delivering gamma-ray beams to users. The construction of the VEGA System was awarded to Lyncean Technologies Inc. and its delivery, installation and acceptance are scheduled to be completed in early 2023.

The system will deliver gamma-rays with energy continuously variable from 1 MeV up to 19.5 MeV covering the energy range relevant for low-energy nuclear physics and astrophysics studies, as well as applied research in materials science, management of nuclear materials, and life sciences. The beams will be quasi-monochromatic by having a relative energy bandwidth better than 0.5%, high intensity with a spectral density higher than 0.5 x 104 photons/eV/s and high degree of linear polarization at more than 95%. With these parameters, the VEGA System will be the most advanced gamma-ray source in the world having about one order of magnitude higher gamma-ray flux and at least a factor of two smaller relative bandwidth than the current state-of-the-art.

    VEGA main parameters:

  • Maximum Photon Energy ≥ 19.5 MeV
  • Tunability of the Photon Energy Steplessly variable
  • Linear Polarization of Gamma-Ray Beam ≥ 95%
  • Divergence at Full Width Half Maximum (FWHM) of Beam Spot ≤ 1.5 x 10-4 rad
  • Average Relative Bandwidth of Gamma-Ray Beam (FWHM) ≤ 5.0 x 10-3
  • Total Photon Flux ≥ 1.0 x 1011 1/s
  • Time-Average Spectral Density at Peak Energy≥ 5.0 x 103 1/(s eV)
  • Average Spectral Off-Peak Gamma-Ray Background Density ≤ 1.0 x 10-2 1/(s eV)
  • Angular Spectral Flux Density ≥ 1.0 x 109 1/(s mrad2 0.1%W)

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