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


Journal Article

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 16O(γ→,γ)16O was performed. © 2003 Elsevier B.V. All rights reserved.

Full Text

Duke Authors

Cited Authors

  • Ahmed, MW; Feldman, G; Litvinenko, VN; Nelson, SO; Norum, BE; Perdue, B; Pinayev, IV; Sawatzky, B; Tonchev, AP; Wu, Y; Weller, HR

Published Date

  • January 11, 2004

Published In

Volume / Issue

  • 516 / 2-3

Start / End Page

  • 440 - 444

International Standard Serial Number (ISSN)

  • 0168-9002

Digital Object Identifier (DOI)

  • 10.1016/j.nima.2003.08.166

Citation Source

  • Scopus