Hot Liner Divertor Concept
An evaluative analysis of the distinctive features of hot liner divertor concept is done to manifest main limitations determined by formation of dust and redeposited films. It is shown that the scenario of the concept is strongly restricted by the process of Be film formation on the surface of liner plates at temperature below 1300–1400 K°. Such a film formation results in appearing rather wide areas of PFC covered by chemically active Be. To protect this film formation the minimum temperature of liner plates should be more than 1300-1400 K°. Irradiation of this film during long pulse disruptions or ELMs leads to intensive Be dust formation which locates at the bottom of divertor volume. W dust formation and carbon collection beneath the liner plates depends mainly on the power load of the Vertical Target during off-normal events. It is shown that influence of these processes is minimal during short pulse disruptions.
KeywordsToxicity Dust Graphite Steam Helium
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