Samenvatting
Quasi-steady operation has been achieved at JET in the high-confinement
regime with internal transport barriers (ITBs). The ITB has been
maintained up to 11 s. This duration, much larger than the energy
confinement time, is already approaching a current resistive time. The
high-performance phase is limited only by plant constraints. The radial
profiles of the thermal electron and ion pressures have steep gradients
typically at mid-plasma radius. A large fraction of non-inductive
current (above 80%) is sustained throughout the high-performance phase
with a poloidal beta exceeding unity. The safety factor profile plays an
important role in sustaining the ITB characteristics. In this regime
where the self-generated bootstrap current (up to 1.0 MA) represents 50%
of the total current, the resistive evolution of the non-monotonic
q-profile is slowed down by using off-axis lower-hybrid current drive.
Originele taal-2 | Engels |
---|---|
Pagina's (van-tot) | 1057-1086 |
Tijdschrift | Plasma Physics and Controlled Fusion |
Volume | 44 |
Nummer van het tijdschrift | 7 |
DOI's | |
Status | Gepubliceerd - 1 jul. 2002 |
Extern gepubliceerd | Ja |