Background reduction in FEL-generated γ-ray beam experiments using giant high-peak power pulses

Abstract

A new method to eliminate beam-uncorrelated background in photonuclear experiments has been developed at the High Intensity Gamma-Ray Source (HIγS). Background suppression of over 3 orders-of-magnitude has been achieved by using a gain modulation technique to generate giant high-peak power (GHPP) pulses in the OK-4/ Duke storage ring FEL. The time structure of these laser pulses was tuned so that their duration was ∼100 μs , repeated every 50 ms . The associated FEL photons were backscattered from 780 MeV electrons to produce linearly polarized 40 MeV γ -rays having the same time structure as the FEL pulses. As an initial test of the technique, a nearly background-free measurement of the analyzing power in the Compton scattering reaction 16 O( γ → , γ) 16 O was performed.