Publication

NEGATIVE TRIANGULARITY TOKAMAK OPERATION IN TCV

Olivier Sauter, Stefano Coda, Basil Duval, Laurent Villard, Stephan Brunner
2023

Abstract

TCV experiments and novel theoretical studies have addressed key questions regarding the operational space of negative triangularity (NT) plasmas in view of an L-mode NT reactor, in terms of stability, performance properties and core-edge integration. We show that reducing the top triangularity (δtop) to more negative values induces an H-L back transition, confirming the direct dependence between H-mode existence and access to 2nd ballooning stability region. We also show that the X-point δ can prohibit H-mode access if sufficiently negative. Using these conditions to stay in L-mode, we show the sustainment of a stationary high βN NT plasma, with H98y2 > 1, using real-time β control with NBI as an actuator. This plasma has Ti > Te over the whole profile. Gyrokinetic simulations show that the benefit of NT might be lost for aspect ratio

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https://infoscience.epfl.ch/entities/publication/c52f8c0a-52c5-4141-9635-698b8e5ac6ce

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Olivier Sauter, Stefano Coda, Basil Duval, Laurent Villard, Stephan Brunner
2023

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/c52f8c0a-52c5-4141-9635-698b8e5ac6ce

About this result

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