GFA Accelerator Seminars

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

by Dr Elias Gerstmayr (SLAC)


We present a design for a pixelated scintillator based gamma-ray spectrometer [1] that was successfully fielded on an all-optical inverse Compton scattering experiment [2]. Here it measured up to 100 MeV gamma-ray photon energies emitted in the collision of a laser wakefield accelerated electron beam with a tightly focused, intense laser pulse. We were able to extract the gamma-ray spectra generated by modelling the scintillator response in GEANT4 and fitting photon spectra from a quantum Monte Carlo code.

[1] KT Behm et al., Review of Scientific Instruments 89 (2018)

[2] J Cole et al., Physical Review X 8 (2018)

For details, contact Pavle Juranic