077-05/rs Liquid Metal Discussion Session  Summarized special conference call for liquid surfaces – written summary and presentations online

077-05/rs  Discussion on whether we adequately know the temperature limitations of liquid surfaces in divertor, particularly lithium –Done extensively in ALPS with the tools of the times, good estimates provided (Brooks) –Not yet tested in a large devise, opportunity to do this in NSTX now at least for lithium in regime evaporation ~ ion flux  We don’t have a clear winner in the fast vs thin system debate –MHD a dominant issue still for fast –Temperature limitations and power handling issue for thin  Should we revisit and extend any of this work –Small group study of questions – fast vs thin, power vs particles –Implications of power conversion / power cycle compatibility –Support NSTX particularly investigating lithium temp limits –Study of potential for thin, capillary restrained, conduction dominated layers from a power reactor perspective Revisiting ALPS conclusions…

077-05/rs Feel of the group and Tungsten  Roughly a ~2/1 ratio of people thought at least some minor effort increase on liquid surfaces was warranted  What is the real ratio of work 90/10 or 75/25 on liquid surfaces (from funded PFC programs or from general PFC contributors)  Question from Gene, are we doing enough on tungsten –which is our real main line demo material, and ITER relevant –More coordinate between plasma / surface materials people and structural / irradiation damage material people and wider nano-materials expertise –Many comments that the nano expertise already available in the group, but many said more participation by irradiation damage material people would be welcome addition.. 3