Magnetic diagnostics are essential for the operation and understanding of a magnetic fusion
device. Magnetic data are used in real time to measure and control the current, shape, and …

The spherical tokamak (ST) is a leading candidate for a Fusion Nuclear Science Facility
(FNSF) due to its compact size and modular configuration. The National Spherical Torus …

Spherical tokamaks (STs) typically have lower magnetic fields than conventional tokamaks,
but similar mass densities. Suprathermal ions with relatively modest energies, in particular …

MAST plasmas with a safety factor above unity and a profile with either weakly reversed
shear or broad low-shear regions, regularly exhibit long-lived saturated ideal …

Abstract The National Spherical Torus Experiment (NSTX) has demonstrated the
advantages of low aspect ratio geometry in accessing high toroidal and normalized plasma …

Abstract The National Spherical Torus Experiment (NSTX) has undergone a major upgrade,
and the NSTX Upgrade (NSTX-U) Project was completed in the summer of 2015. NSTX-U …

The low-aspect ratio, low magnetic field and wide range of plasma beta of NSTX plasmas
provide new insight into the origins and effects of magnetic field errors. An extensive array of …

In this paper, we investigate the influences of shear flows on dynamic evolutions of the m/n=
2/1 double tearing mode (DTM), using three-dimensional, toroidal, and nonlinear resistive …

The accurate identification and control of plasma instabilities is important for successful
fusion experiments. First-principle simulations that can provide physics-based instability …

A motional Stark effect diagnostic has been utilized to reconstruct the parallel current density
profile<? format?> in a spherical-torus plasma for the first time. The measured current profile …