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(OV/1-3) Overview of JT-60U Results toward High Integrated Performance in Reactor-Relevant Regime

T. Fujita1), JT-60 Team
1) Japan Atomic Energy Research Institute, Naka Fusion Research Establishment, Naka-machi, Naka-gun, Ibaraki-ken, Japan

Abstract.  Toward steady sustainment of high integrated performance, we have developed weak magnetic shear (high $ \beta_{p}^{}$ mode) and reversed magnetic shear plasmas. As a large-sized tokamak equipped with a variety of devices for heating, current drive and profile/shape control, JT-60U has high ability to approach the conditions required in reactors: low values of normalized Larmor radius and collisionality, high temperatures with Te $ \gtrsim$ Ti, etc. This paper reviews recent JT-60U results with the emphasis on the projection to the reactor-relevant regime. Full non-inductive current drive has been achieved in a 1.8 MA high $ \beta_{\mathrm{p}}^{}$ H-mode plasma with $ \beta_{\rm N}^{}$ = 2.4, HHy2 = 1.2 and high fusion triple product ( 3×1020 m- 3keVs) owing to increased N-NB power. In a reversed shear plasma, HHy2 = 1.4 at ne/nGW = 0.8 under the full non-inductive current drive has been achieved with injection of LHRF and N-NB. In box-type ITBs with reversed shear, barriers for ions and electrons were sustained in a regime with Te $ \gtrsim$ Ti. The pedestal pressure was doubled with increased total poloidal beta in pellet-injected high triangularity plasmas with type I and II ELMs. Stable existence of current hole was demonstrated.

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IAEA 2003