Overview of recent DiMES and MiMES PMI experiments in DIII-D

An overview of Plasma-Material Interactions (PMI) research at DIII-D tokamak over the last two years using the Divertor Material Evaluation Station (DiMES) and the Mid-plane Material Evaluation Sample (MiMES) is presented. Net/gross erosion and re-deposition of common and novel Plasma Facing Materials (PFMs) such as various grades of tungsten and W_f/W composites/alloys, SiC and other advanced materials are studied in the divertor. Comparisons of spectroscopy and post-mortem ion beam analysis are used to calibrate the S/XB coefficients for various spectral lines. DiMES is also used for studies of hydrogenic retention in various PFMs, dust production and transport, pellet launches, and effects of transients like edge-localized modes on PFMs and arc ignition. Experiments with controlled melting of W and Al (as proxy to Be) are performed/planned and results will be compared to MEMOS-U modeling. MiMES, located near the outboard mid-plane, is used primarily to house Collector Probes (CPs) in material migration experiments with ¹³C methane injection and studies of W leakage from a closed SAS-VW divertor. Comparisons of CP results with DIVIMP/MAFOT/3DLIM modeling will be presented.