Spontaneous and driven reduced turbulence modes in the RFX reversed field pinch

The reversed field pinch (RFP) is a highly-sheared nearly force-free magnet ic field configuration, which is almost entirely self-generated, via a dyna mo process. A still open question is the level of turbulence entailed by th e dynamo and how it could be mitigated in order to improve plasma confineme nt. The paper addresses the issue, first discussing the properties of the m agnetic profiles of RFX in relation to other RFPs, then analysing some tran sient enhanced confinement modes which suggest that the improved confinemen t is due to a reduced dynamo action.