A linac that can accelerate either positrons or electrons is now operating at Lawrence Radiation Laboratory, Livermore. The accelerator can produce variable‐energy beams of up to 100‐MeV electrons or 80‐MeV positrons. The positrons are used to produce a high‐intensity monochromatic photon beam that will explore photonuclear processes over a wide energy range. The electrons will primarily be used for neutron‐physics studies through creation of a pulsed neutron source.

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