Advanced divertor programme results from DIII-D

A summary of DIII-D boundary and divertor experiments directed at solving the scientific and technical problems of high power, long pulse tokamak divertors is presented. Single null poloidal divertors were studied in the standard DIII-D open divertor configuration and in interaction with the toroidally symmetric ring biasing electrode and exhaust gas collection plenum. New results are reported for: scrape-off layer (SOL) transport; SOL density and impurity influx; SOL density and divertor bias; ELM particle and energy content; ELMing SOL transport; open radiative divertor; passive exhaust gas collection; divertor bias and exhaust gas collection; and divertor bias and H-mode threshold. The paper concludes with future plans for divertor research at DIII-D. (author). 12 refs, 4 figs