RT Journal Article ID 227a4b7c295474b3 A1 Cekmer, Ozgur A1 Sargsyan, Khachik A1 Blondel, Sophie A1 Najm, Habib N. A1 Bernholdt, David E. A1 Wirth, Brian D. T1 UNCERTAINTY QUANTIFICATION FOR INCIDENT HELIUM FLUX IN PLASMA-EXPOSED TUNGSTEN JF International Journal for Uncertainty Quantification JO IJUQ YR 2018 FD 2018-07-06 VO 8 IS 5 SP 429 OP 446 K1 nuclear fusion K1 plasma-facing components K1 uncertainty quantification K1 Bayesian inference K1 model error AB In this work, the surface response of a tungsten plasma-facing component was simulated by a cluster-dynamics code, Xolotl, with a focus on quantifying the impact of uncertainty in one of the input parameters to Xolotl, namely, the incident helium flux. The simulated conditions involve a tungsten surface exposed to 100 eV helium ion implantations with a flux of either 4 × 1022 or 4 × 1025 He m-2s-1. Two sources were used to describe the implanted helium depth distribution in tungsten, either molecular dynamics (MD) or a binary collision approximation code, the stopping and range of ions in matter (SRIM). The aim of this work is to evaluate and examine uncertain predictions on the helium retention based on these two different modeling methodologies that either neglect electronic energy loss or the crystalline structure of the solid, respectively. An embedded model-form error approach was pursued here in order to arrive at predictions that account for variability due to the two different data sources, and the impact of this model-form uncertainty in incident helium flux on Xolotl output was presented for the two implantation fluxes. PB Begell House LK https://www.dl.begellhouse.com/journals/52034eb04b657aea,5c1dbad0790f1b32,227a4b7c295474b3.html