Abstract
A photoneutrons source based on the NSC KIPT LUE-40 electron linac was designed and constructed to study the effect of neutron and gamma radiation on the properties of materials used in high-energy physics (HEP) detectors. The source was used to irradiate the optical elements of the PLUME detector in LHCb experiment with the neutron fluency of 1014 cm-2. Ways to increase the neutron yield, in particular, by installing an additional high Z metal shell are shown. At electron energy of 85 MeV, the neutron yield exceeds 10-2 neutron over one electron.
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