Report on Radiation Damage Effects in a Titanium Target Under Photon Irradiation

[摘要] Following the same approach as with the W-Re targets [l], we have calculated the damage induced by photon irradiation (22.1 MeV average energy) in titanium targets. Stefan Roesler calculated, using FLUKA [2] the spallation products, neutrons and fission products from the interaction of the photons with the titanium target. Using these initial values of energies and positions, we calculated the number of defects produced per incoming photon. It should be noted that the threshold displacement energy for defect production of Titanium as measured experimentally is between 21 and 30 eV [3]. We used a value of 25eV. This is a much lower value than for the case of W-alloys (90 eV) which implies a larger defect production for the same deposited energy in the case of Titanium. The number of defects for different neutron energies was calculated using SPECTER [4] Figure 1(a) shows the number of defects as a function of energy for the case of Ti as compared to W, in Figure 1(b). The number of defects is much larger in the Ti case due to the low threshold displacement energy as explained.

[发布日期] 2002-08-30 [发布机构] Lawrence Livermore National Laboratory

[关键词] Spallation Fragments;Photons;Irradiation;36 Materials Science;Production