Return To: Session OV/1 - Magnetic Fusion Overview 1
Prev Page: (OV/1-2) Recent Developments Towards Steady State Physics and
Next Page: (OV/1-4) Overview of JET Results

(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 T_e $\gtrsim$ T_i, 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, HH_y2 = 1.2 and high fusion triple product ( 3×10²⁰ m^{- 3}keVs) owing to increased N-NB power. In a reversed shear plasma, HH_y2 = 1.4 at n_e/n_GW = 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 T_e $\gtrsim$ T_i. 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.

Read the full paper in PDF format.