Abstract:
A gamma-ray beam produced by Compton scattering of a laser beam with a relativistic electron beam
has been used for nuclear physics research at the high intensity g-ray source (HIgS) facility at Duke
University. The success of many experiments using the gamma-ray beam critically depends on the
accurate knowledge of the gamma-ray beam energy distribution which is typically obtained by
unfolding a measured energy spectrum. Conventionally, the detector response function used in the
spectrum unfolding is simulated by a simple Monte Carlo code in which an isotropic gamma-ray event
generator is used. However, for a Compton scattered gamma-ray beam, this simulation method could
lead to an inaccurate detector response function, since it neglects the spatial and energy distributions of
the gamma-ray beam. In this paper, we will present a novel end-to-end gamma-ray spectrum
reconstruction method by completely modeling the process of the Compton gamma-ray beam
production, collimation, transportation and detection. Using this method, we have successfully
reconstructed the energy distribution of HIgS beams for nuclear physics research with a high degree
of accuracy.
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