EAST lower tungsten divertor concept and technics development

The EAST upper divertor was updated to tungsten divertor in 2014, but the lower divertor was still left carbon divertor. The upper divertor heat load exhausting capability can be up to 10MW/m² , but only 2MW/m² for the lower divertor. To meet the device high performance plasma operation and high plasma heating power. The lower divertor planed to be updated to tungsten divertor. The lower tungsten divertor concept design started from 2016. Considering plasma configurations, neuter particles exhausting, field expansion, cost reduction and so on, geometry of lower divertor was optimized and will be different from upper tungsten divertor geometry.