Abstract:
A gamma-ray beam produced by Compton scattering of a laser beam with an electron beam can be used
to measure the electron beam parameters. In several published works, a simple fitting model has been
applied to determine the electron beam energy and energy spread without considering the gamma beam
collimation and electron beam emittance effects. This fitting model is rederived in this work, and the
underlying assumptions and resultant limitations are discussed. To overcome these limitations, a new
fitting model is proposed, which takes into account the collimation and emittance effects. Using the new
model and a gamma-ray beam produced at the high intensity g-ray sources facility at Duke University, we
have successfully determined the electron beam energy with a relative uncertainty of about 3 x10^-5
around 460 MeVas well as the electron beam energy spread.We also experimentally demonstrated for the
first time that a small relative energy change (about 4 x 10^-5) of the electron beam by varying the storage
ring dipole field can be directly detected using the Compton scattering technique.
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