Scenario development for high βp low torque plasma with qmin above 2 and large-radius internal transport barrier in DIII-D

A recent experiment on DIII-D, which was conducted by the joint research team from DIII-D and EAST, has extended the previous high β p , high q min regime, which has been tested in the 2013 DIII-D/EAST joint experiment, to inductive operation at higher plasma current ( I p = 0.8 MA) and significantly higher normalized fusion performance ( G = H 89 β N / q 95 2 = 0.16 ). The experiment aims at exploring high performance scenario with q m i n > 2 and reduced torque for long pulse operation, which can be potentially extrapolated to EAST. The effort was largely motivated by the interest in developing a feasible scenario for long-pulse high performance operation with low torque on EAST. Very high confinement, H 89 = 3.5 or H 98 , y 2 = 2.1 with β N ∼ 3.0 , has been achieved transiently in this experiment together with q m i n > 2 and reduced NBI torque ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scr