Pietrzyk, Z. A.Angioni, C.Behn, R.Coda, S.Goodman, T. P.Henderson, M. A.Hofmann, F.Sauter, O.2008-04-162008-04-162008-04-16200110.1103/PhysRevLett.86.1530https://infoscience.epfl.ch/handle/20.500.14299/21718WOS:000167010000034Current profile tailoring by electron cyclotron heating (ECH) and current drive (ECCD) is used to improve central electron energy confinement in the TCV tokamak. Counter-ECCD on axis alone achieves this goal in a transient manner only. A stable scenario is obtained by a two-step sequence of err-axis ECH, which stabilizes magnetohydrodynamics modes, and on-axis counter-ECCD, which generates a flat or inverted current profile. This high-confinement regime, with central temperatures up to 9 keV (at a. normalized beta (N) similar to 0.6), has been sustained for the entire duration of the heating pulse, or over 200 electron energy confinement times and 5 current redistribution times.text::journal::journal article::research article