Scrape-off layer plasmas for ITER with 2nd X-point and convective transport effects

Plasma fluxes to the divertor region in ITER near the magnetic separatrix have been modeled extensively in the past. The smaller, but potentially very important fluxes to the main chamber and outer divertor regions are the focus of the present paper. Two main additions to the usual transport modeling are investigated: namely, convective radial transport from intermittent, rapidly propagating ‘blob’ events, and inclusion of the magnetic flux-surface region beyond the second X-point that actually contacts the main-chamber wall. The two-dimensional fluid transport code UEDGE is use to model the plasma, while the energy spectrum of charge-exchange neutrals to the main chamber wall is calculated by the DEGAS 2 Monte Carlo code. Additionally, the spatial distribution of beryllium sputtered from the main chamber wall is determined in the fluid limit.

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