Background reduction in FEL-generated γ-ray beam experiments using giant high-peak power pulses
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment(2004)
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 ∼100μs, repeated every 50ms. The associated FEL photons were backscattered from 780MeV electrons to produce linearly polarized 40MeVγ-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 16O(γ→,γ)16O was performed.
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Key words
25.20.Dc,41.60.Cr,29.20.Dh,29.27.Hj,29.40.Vj
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