title: Maximum-J capability in a quasiaxisymmetric stellarator.
abstract: Maximum-J (J is the second adiabatic invariant) capability, i.e., the radial derivative of J has the same sign as that of pressure, is investigated in a quasiaxisymmetric (QA) stellarator to investigate improved confinement. Due to the existence of nonaxisymmetry of the magnetic field strength, a local maximum of J is created to cause the drift reversal. External controllability of the maximum-J condition is also demonstrated, by which the impact of magnetic configuration on turbulent transport can be studied.
authors.affiliation: National Institute for Fusion Science, Toki 509-5292, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Yokoyama
authors.forename: K
authors.initials: K
authors.lastname: Itoh
authors.forename: S
authors.initials: S
authors.lastname: Okamura
authors.forename: K
authors.initials: K
authors.lastname: Matsuoka
authors.forename: S I
authors.initials: SI
authors.lastname: Itoh