Session GP1 - Poster Session IV.
POSTER session, Tuesday afternoon, October 30
Exhibit Hall B,
The understanding of impurity transport in the edge plasmas is crucial for the design of future fusion reactors. Impurities in the core plasma can dilute the fuel and produce a significant amount of radiation, which will lead to the loss of input power. A system has been developed for studying impurity transport behavior in the edge plasma of Alcator C-Mod by viewing impurity emission patterns (plumes) generated by local gas injection.(S. Gangadhara, et al., J. Nucl. Mater., \textbf290-293) (2001) 598. Dispersal patterns of C^+1 and C^+2 ions have been observed for a wide range of local plasma conditions, including variations in density, temperature, parallel velocity and radial electric field. A database of impurity dispersal patterns is being assembled to correlate variations in the extent and asymmetry of these patterns along and across the field lines with local plasma conditions.