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%. © 2007 The American Physical Society.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
Terranova, D., Alfier, A., Bonomo, F., Franz, P., Innocente, P., & Pasqualotto, R. (2007). Enhanced confinement and quasi-single-helicity regimes induced by poloidal current drive. Physical Review Letters, 99(9), -. . https://doi.org/10.1103/PhysRevLett.99.095001