Surface impurity removal from DIII-D graphite tiles by boron carbide grit blasting

R.L. Lee, M.A. Hollerbach, K.L. Holtrop, A.G. Kellman, P.L. Taylor, W.P. West
15th IEEE/NPSS Symposium. Fusion Engineering  
major tasks involved the removal of accumulated metallic impurities from the surface of the graphite armor tiles. During the latter half of 1992, the DIII-D tokamak at Scanning electron microscope (SEM) photographs of tiles General Atomics (GA) underwent several modifications of its removed from DIII-D revealed that most of the Ni, Cr, and Fe interior. One of the major tasks involved the removal of impurities were within the top 20 laln. of the tile surface. accumulated metallic impurities from
more » ... lic impurities from the surface of the hnpurity influx into the discharges often results in degraded graphite tiles used to line tile plasma facing surfaces inside of plasma performance. The dominant metallic impurity in the the tokamak. Approximately 1500 graphite tiles and 100 plasma discharges was nickel, which is the major component boron nitride tiles from tile tokamak were cleaned to remove of tile Inconel vessel wall. Iron, chromium, copper, and 0 S 10 *Manuscript
doi:10.1109/fusion.1993.518533 fatcat:3leagj4irvhypntdwn7msfnpba