Enhanced confinement and quasi-single-helicity regimes induced by poloidal current drive.
Enhanced confinement regimes with quasihelical symmetry are reproducibly obtained in the modified reversed field pinch eXperiment (RFX)-mod by reducing the level of internal chaos through the combination of a smooth magnetic boundary (through a virtual shell scheme) and the oscillating poloidal current drive technique. The plasma moves from a chaotic multiple helicity towards a quasi-single-helicity regime with a magnetic island showing high temperature and soft x-ray emissivity. The chaos reduction involves also the plasma outside the island allowing for a global enhanced confinement with an improvement up to 50%.
Terranova
D
D
Consorzio RFX, Associazione Euratom-ENEA sulla Fusione-Corso Stati Uniti, 4, I-35127 Padova, Italy.
Alfier
A
A
Bonomo
F
F
Franz
P
P
Innocente
P
P
Pasqualotto
R
R