Intensity Upgrade to the TRIUMF 500 MeV Large-Area Neutron Beam

The TRIUMF BL1B neutron and proton facility has been upgraded with improved shielding of the neutron-production converter to provide higher neutron intensities. The facility can provide both collimated beams for device testing and large-area beams for systems testing. FLUKA calculations were performed to optimize the shielding and to determine the neutron energy spectrum and transverse profiles. Activation measurements were done to confirm the neutron flux at different positions.