Return To: Session EX1 - Performance, Improved Modes, Alphas (Tuesday,
Prev Page: (EX1/1) Alpha Particle Studies During JET DT Experiments
Next Page: (EX1/3) Overview of RI-Mode Results on TEXTOR-94

(EX1/2) High Performance Experiments in JT-60U Reversed Shear Discharges

   
T. Fujita , Y. Kamada , S. Ishida , Y. Neyatani , T. Oikawa , S. Ide , S. Takeji , Y. Koide , A. Isayama , T. Fukuda , T. Hatae , Y. Ishii , T. Ozeki , H. Shirai  and the JT-60 Team 
 
Japan Atomic Energy Research Institute, Naka Fusion Research Establishment, Naka-machi, Naka-gun, Ibaraki-ken, 311-0193 Japan

Abstract
The operation of JT-60U  reversed shear  discharges has been extended to a high plasma current, low-q regime keeping a large radius of the internal transport barrier (ITB) and the record value of equivalent fusion multiplication factor in JT-60U, $\rm Q_{DT}^{eq} = 1.25$, has been achieved at 2.6 MA. Operational schemes to reach the low-q regime with good reproducibility have been developed. The reduction of $\rm Z_{eff}$ was obtained in the newly installed W-shaped pumped divertor. The beta limit  in the low-$\rm q_{min}$ regime, which limited the performance of L-mode  edge discharges, has been improved in H-mode  edge discharges with a broader pressure profile, which was obtained by power flow control with ITB degradation. Sustainment of ITB and improved confinement for 5.5 seconds has been demonstrated in an ELMy H reversed shear discharge.

     

Read the full paper in PDF format.