Calculations of Scenarios with Negative Triangularity for the T-15MD Tokamak

Abstract

Investigation of discharges with a negative triangularity plasma configuration is carried out on various tokamaks: TCV, D-IIID, and ASDEX-U. Negative triangularity (NT) experiments in the TCV show a reduction in electron heat transport by a factor of two compared with the positive triangularity D-shaped configurations. Recent experiments on DIII-D with a NT configuration showed improved confinement compared to the positive triangularity (PT) D-shaped plasmas over a range of auxiliary heating powers and, in particular, for the case T_e ~ T_i. In addition, it was found that the NT-shaped plasma has the capability to achieve significant normalized β. The purpose of this study is a computational confirmation of the possibility of implementing scenarios with NT discharges in the ohmic heating mode in the T-15MD tokamak with its standard poloidal system. Simulation results show that the poloidal system of the T-15MD tokamak is rather flexible for study of scenarios with D-shaped NT. It is proposed to expand the research program in the T-15MD by including in it the study of scenarios with NT.