Session RP1 - Poster Session VIII.
POSTER session, Thursday afternoon, October 30
Fran Hill Southeast Exhibit Hall, ACC
Extensive computer modeling for the Fusion Ignition Research Experiment (FIRE) design study focused on Be/W mixed-material erosion issues, combining several computer codes. Since the FIRE design calls for a beryllium first wall and tungsten divertor, Be can be sputtered and transported to the divertor, forming a Be/W mixture. The goal is to determine the amount of Be deposited on divertor surfaces and to model the mixture's erosion/redeposition properties. Sputtering is calculated from deuterium neutral fluxes (obtained from DEGAS2) and D^+ flux from the plasma. The ion flux includes both the diffusive flux from the UEDGE fluid code and approximations of convective (non-diffusive) transport. The sputtering of Be is determined by VFTRIM-3D. WBC+, part of Argonne's REDEP impurity transport package, calculates the transport of Be to the divertor. Results show that convective transport dominates, increasing Be sputtering to 8x10^21 s^-1, with 4x10^21 s^-1 reaching the divertor plates. The next step is analysis of the erosion properties of the Be/W mixed material with the ITMC code at ANL.