The spherical torus or spherical tokamak (ST) is a member of the tokamak family with its
aspect ratio (A= R 0/a) reduced to A∼ 1.5, well below the normal tokamak operating range …

Since the first H-mode discharges in 2010, the duration of the H-mode state has been
extended and a significantly wider operational window of plasma parameters has been …

Density pumpout and edge-localized mode (ELM) suppression by applied n= 2 magnetic
fields in low-collisionality DIII-D plasmas are shown to be correlated with the magnitude of …

Theoretical guidance is needed on two disruption questions:(1) When is a tokamak
operating in a metastable state in which loss of control is credible (avoidance question)?(2) …

A small relaxation of the axisymmetric magnetic field of a tokamak into a non-axisymmetric
three-dimensional (3D) configuration can be effective to control magnetohydrodynamic …

The zero-frequency linear plasma response to static applied non-axisymmetric fields is
calculated using a resistive two-fluid model in diverted, toroidal geometry. Within this model …

A tokamak relies on the axisymmetric magnetic fields to confine fusion plasmas and aims to
deliver sustainable and clean energy. However, misalignments arise inevitably in the …

We describe the construction of stepped-pressure equilibria as extrema of a multi-region,
relaxed magnetohydrodynamic (MHD) energy functional that combines elements of ideal …

The application of static, non-axisymmetric, nonresonant magnetic fields (NRMFs) to high
beta DIII-D plasmas has allowed sustained operation with a quiescent H-mode (QH-mode) …

The sensitivity of tokamak plasmas to very small deviations from the axisymmetry of the
magnetic field| δ B→/B→|≈ 10-4 is well known. What was not understood until very recently …