A spectrometer for ultrashort gamma-ray pulses with photon energies greater than 10 MeV

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Abstract
We present a design for a pixelated scintillator based gamma-ray spectrometer for non-linear inverse Compton scattering experiments. By colliding a laser wakefield accelerated electron beam with a tightly focused, intense laser pulse, gamma-ray photons up to 100 MeV energies and with few femtosecond duration may be produced. To measure the energy spectrum and angular distribution, a 33 × 47 array of cesium-iodide crystals was oriented such that the 47 crystal length axis was parallel to the gamma-ray beam and the 33 crystal length axis was oriented in the vertical direction. Using an iterative deconvolution method similar to the YOGI code, modeling of the scintillator response using GEANT4 and fitting to a quantum Monte Carlo calculated photon spectrum, we are able to extract the gamma ray spectra generated by the inverse Compton interaction.
Funding Information
  • National Science Foundation (1054164)
  • U.S. Department of War (W911NF-16-1-0044)
  • Knut och Alice Wallenbergs Stiftelse (2012-5644, 2013-4248)
  • U.S. Department of Energy (DE-NA0002372)
  • Science and Technology Facilities Council (ST/J002062/1, ST/P000835/1)
  • Engineering and Physical Sciences Research Council (EP/ M018555/1, EP/M018091/1, EP/M018156/1, EP/N027175/1, EP/P010059/1)
  • H2020 European Research Council (682399)
  • H2020 Marie Skłodowska-Curie Actions (701676)

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