Return To: Session PD - Post Deadline Papers
Prev Page: Session PD - Post Deadline Papers
Next Page: (PD/2) Full Absorption of 3rd Harmonic ECH in

(PD/1) Overview of Recent JET Results and Future Perspectives

J. Pamela¹⁾ and JET-EFDA Team^1)
 
1) EFDA Close Support Unit, Culham Science Centre, Abingdon, Oxon, OX14 3EA, UK

Abstract.  Recent JET results show progress in two directions: consolidation of the ITER reference scenario, the ELMy H-mode, and development of regimes with internal transport barriers (ITBs). The beneficial effect of high triangularity in ELMy H-mode - one of the features of the new ITER design, has been confirmed in particular to extend the operation limits. Indeed three different ELMy H-mode scenarios are shown to allow operation at or above the Greenwald density limit with limited or no confinement degradation: (1) operation at high triangularity (up to $\delta$ = 0.47) with controlled gas puffing; (2) operation well above the L-H transition threshold ( P_in > 2.5P_{L - H}) with controlled gas puffing; (3) impurity seeding. The level of confidence in the ITER ELMy H-mode reference scenario has therefore increased further and is high; research should now focus towards milder ELMs. A very significant progress in LHCD coupling has been achieved, with routine power in the 2-4 MW range. LHCD preheat allows to control efficiently the q profile, giving access to strongly reversed shear plasmas, with very broad ITBs on T_i, T_e and n_e, achieved at reduced power thresholds. ITBs are being developed, either towards high performance ( H$\beta_{\mathrm{N}}^{}$ $\sim$ 7.5 achieved) or towards steady state (full non-inductive current drive achieved during 1 second).

Read the full paper in PDF format.