A new annular collimator system of SLEGS beamline at Shanghai Light Source

Basing on the inverse Compton scattering of 10640 nm photons from a 100 W CO2 laser on 3.5 GeV electrons from the Shanghai Light Source, Shanghai laser electron gamma source (SLEGS) produces gamma-rays in the energy range of 660 keV–21.7 MeV with a flux of 105–107 photons/s. A new annular collimator...

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Published inNuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms Vol. 519; pp. 9 - 14
Main Authors Hao, Z.R., Fan, G.T., Wang, H.W., Xu, H.H., Liu, L.X., Song, L.L., Hu, X.R., Li, X.X., Kuang, P., Jin, S.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 15.05.2022
Subjects
Annular collimator system
Geant4 simulation
Quasi monochromatic gamma-ray extending
Shanghai laser electron gamma source
Annular collimator system
Geant4 simulation
Shanghai laser electron gamma source
Quasi monochromatic gamma-ray extending
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Summary:Basing on the inverse Compton scattering of 10640 nm photons from a 100 W CO2 laser on 3.5 GeV electrons from the Shanghai Light Source, Shanghai laser electron gamma source (SLEGS) produces gamma-rays in the energy range of 660 keV–21.7 MeV with a flux of 105–107 photons/s. A new annular collimator system was designed to extend the low energy range of SLEGS to 100 keV. Gamma-ray beams in the extended range are quasimonochromatic and with a best possible bandwidth of 13.96% with the flux larger than 104 photons/s. The new annular collimator will expand the application areas, and constitutes a critical component of the SLEGS. The Geant4 simulations show that the annular collimator equipped at the experiment hutch is effective in extending energy range and turning bandwidths.
ISSN:0168-583X
1872-9584
DOI:10.1016/j.nimb.2022.02.010