Photoneutron Production on HERMES III Using an Intense Bremsstrahlung Source

An intense reusable source of pulsed photoneutrons has been developed for HERMES III, delivering 0.5 to 1x10/sup 14/ n/pulse with an average kinetic-energy of 1. 8 to 1. 3 MeV, respectively, over a useful area of 150 cm/sup 2/ in a pulse width on the order of 15 ns. Corresponding to this source, a numerical model has been developed that predicts characteristics that are in agreement with measurements.