Session 1S - TFTR.
POSTER session, Monday morning, November 11
Exhibit Hall - Concourse Level, Adam's Mark
Significant improvements in supershot confinement have been achieved with wall conditioning by Li pellet injection. However the mechanism producing the improvement has yet to be demonstrated. To help guide models for understanding this mechanism, measurements have been made to study the Li-deposition profile on the inner bumper limiter and the relative influxes of Li and C from the limiter. Lithium pellets were injected into plasmas in which the high heat flux region of the plasma-limiter contact was located at a fixed poloidal angle. In the next shot the LiII light at 548.5 nm was imaged by a filtered TV camera as the plasma-limiter contact point was varied poloidally in time by changing the plasma major radius. The distribution of Li light intensity along the limiter surface is compared with profiles of the CII and H\alpha intensity and with model predictions.