Negative Triangularity Tokamak as Fusion Energy System

Fusion energy development is quite successful in both getting equivalent energy breakevencondition in large tokamak and clarifying many important physics in the magnetically confinedplasma to proceed to a fusion experimental reactor, ITER. Now, fusion research has to solvethe power handling toward fusion demonstration power reactor (DEMO). A tokamak plasma withstrongly negative triangularity may o er such an opportunity as an innovative concept. Experimentaland theoretical works at CRPP-EPFL shows promising results for negative triangularity tokamak. In this paper, we review the current understanding of such configuration in both physicaland technological aspects.