Fig. 1. Arrangement of Fluka simulation

Fig. 2. Cross section of photonuclear reaction for different materials

Fig. 3. Comparison of neutron yields of different materials

Fig. 4. Neutron yield versus spread angle

Fig. 5. Neutron space distributions. (a) Neutron yield versus target thickness at different electron temperatures; (b) variation in B with target thickness

Fig. 6. Size of neutron source. Statistical distributions of (a) neutron generation position on XY plane and (b) different depths in target on YZ plane; (c) FWHM of distribution function on YZ plane when electron spread angles are 20°and 40°

Fig. 7. Normalized angular distributions of neutron flux. (a) Different materials; (b) different electron temperatures; (c) different radii of target; (d) neutron yield for different target radii

Fig. 8. Photoneutron spectra at different electron temperatures normalized by peak value

Fig. 9. Time distribution and revolution of neutrons. (a) Time distribution of normalized neutron production intensity; (b) revolution of neutron flux on rare surface of target