External ion beam analysis of the TFTR bumper limiters

Following the 1988 operational campaign of the Tokamak Fusion Test Reactor (TFTR), 63 bumper-limiter tiles were removed for analysis. Each tile was analyzed ex vacuo for deuterium contamination. The total deuterium content was obtained using a new two-point approximation technique for exponential depth profiles. Several tiles were further analyzed to provide detailed two- and three-dimensional mapping and line scans down the sides of tiles for deuterium. Comparison of the deuterium data for the 1987 and 1988 campaigns indicates that deuterium deposition does not depend solely upon total integrated fueling. D fueling for the 1988 campaign was comparable to proposed fueling for future DT shot scenarios in TFTR. 1988 deuterium data lead to a tritium inventory estimate of ∝ 3 g T in the limiter of TFTR for this fueling level. Scans along the side edges of limiter tiles indicate that the edges retain high levels of deuterium and are thus an important factor in T inventory estimates. (orig.)