Maximum-J capability in a quasiaxisymmetric stellarator.
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.
Yokoyama
M
M
National Institute for Fusion Science, Toki 509-5292, Japan.
Itoh
K
K
Okamura
S
S
Matsuoka
K
K
Itoh
S I
SI