Welcome to LEGS
The Laser Electron Gamma-ray Source (LEGS) at Brookhaven National Laboratory produces beams of tagged gamma-rays up to 470 MeV by backscattering laser light from 2.8 GeV electrons circulating a storage ring of the National Synchrotron Light Source at BNL.
The gamma-ray beam rate reaches up to 6 MHz in a beam spot of 2 cm by 1 cm.
The chief characteristic which distinguishes the LEGS beam from other sources of gamma-rays is its high degree of polarization, typically greater than 90%.
The beam is tagged, with an energy resolution of 3 MeV and an efficiency of 100%, by detecting the scattered electrons in a spectrometer incorporated into the storage ring.
Linear or circular polarized beams are available and any polarization states may be sampled during data taking.
Research at LEGS is focused around sensitive tests of models describing the internal structure of protons, neutrons and light nuclei, particularly properties associated with their spin, through measurements of scattering and reactions with polarized photons on polarized targets.
Reports from Recent Runs
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