Error field detection in DIII-D by magnetic steering of locked modes

Locked modes and magnetic field errors in the Madison Symmetric Torus

In the Madison Symmetric Torus (MST) reversed-field pinch [Fusion Technol. 19, 13 1 ( 1991)] magnetic oscillations become stationary (locked) in the lab frame as a result of a process involving interactions between the modes, sawteeth, and field errors. Several helical modes become phase locked to each other to form a rotating localized disturbance, the disturbance locks to an impulsive field e...

extremal region detection guided by maxima of gradient magnitude

a problem of computer vision applications is to detect regions of interest under dif- ferent imaging conditions. the state-of-the-art maximally stable extremal regions (mser) detects affine covariant regions by applying all possible thresholds on the input image, and through three main steps including: 1) making a component tree of extremal regions’ evolution (enumeration), 2) obtaining region ...

Suppression of large edge-localized modes in high-confinement DIII-D plasmas with a stochastic magnetic boundary.

A stochastic magnetic boundary, produced by an applied edge resonant magnetic perturbation, is used to suppress most large edge-localized modes (ELMs) in high confinement (H-mode) plasmas. The resulting H mode displays rapid, small oscillations with a bursty character modulated by a coherent 130 Hz envelope. The H mode transport barrier and core confinement are unaffected by the stochastic boun...

Stabilization of the Resistive Wall Mode in Diii–d by Plasma Rotation and Magnetic Feedback

Modification to the Toroidal Rotation Velocity and Radial Electric Field by Pellet Injection in DIII-D

The ability to modify and control the radial electric field and its radial derivative can lead to direct control of radial transport of plasma in a toroidal device. In the DIII-D tokamak, the injection of deuterium pellets is being investigated as a means of controlling the toroidal rotation velocity and the radial electric field, Er. Solid deuterium cylindrical pellets of 1.8mm and 2.7mm diame...