title: Particle-transport analysis in reversed field pinch helical states.
abstract: This Letter reports the result of a numerical study of particle transport in self-organized single helicity (SH) and quasi-SH reversed field pinch plasmas. Our code, benchmarked against experimental data, predicts a large improvement in particle transport for SH compared to the standard multiple helicity states. The contribution of neoclassical effects is noted. An estimate of the ambipolar electric field in helical states and in fully stochastic magnetic fields is given.
authors.affiliation: Consorzio RFX, Associazione EURATOM-ENEA sulla Fusione, Padova, Italy.
authors.forename: I
authors.initials: I
authors.lastname: Predebon
authors.forename: L
authors.initials: L
authors.lastname: Marrelli
authors.forename: R B
authors.initials: RB
authors.lastname: White
authors.forename: P
authors.initials: P
authors.lastname: Martin