Simulation of the implantation of recoils and displacement production in the 316 stainless steel mercury-container vessel at SNS

In this study, the focus is on the possible effect of mercury and transmute d atom recoils that are implanted into the wall of the stainless steel cont ainer vessel at SNS. Two computer codes were used: Los Alamos high energy t ransport (LAHET) and the stopping and range of ions in matter (SRIM). LAHET provided information of the energy distribution of the recoils upon bombar dment. Also, SRIM simulated the transport of recoils through the mercury la yer adjacent to the stainless steel wall and into the wall itself, and prov ided recoil and displacement concentration profiles in the wall. The calcul ated recoil and displacement concentrations in the near-surface region of t he wall appear to be quite significant. The recoil and displacement concent rations per year at the surface are determined to be about 0.0015 recoil at oms/wall atom and about 17 dpa at the center of an incident proton beam. Th ese concentrations fall to about one-half of the surface values at a penetr ation distance of about 0.1 mum, and the concentrations become negligibly s mall at 0.5 mum and beyond. (C) 2001 Elsevier Science B.V. All rights reser ved.