9 papers
Overview of Enhanced D-alpha and Quasi Continuous Exhaust H-modes at DIII-D
N. Leuthold, Z. Li, M. Faitsch +19
We review the Enhanced D-alpha (EDA) and Quasi-continuous Exhaust (QCE) H-modes that have recently been achieved in the DIII-D tokamak. These scenarios are free of large type-I edg…
Demonstration of H-mode Error Field Identification in a Single Discharge via Island Healing
E. M. Bursch, A. Xie, J. L. Barr +15
Non-disruptive compass scan error field identification via island healing is demonstrated on KSTAR in a single H-mode discharge. This method can allow for up to a 75% reduction in…
Assessing the effect of error field penetration during plasma current ramp-up in the DIII-D tokamak
C. F. B. Zimmermann, E. M. Bursch, C. Paz-Soldan +4
This work provides evidence that established error field penetration threshold scalings remain applicable during plasma current ramp-up. In dedicated DIII-D experiments with impose…
Coordinate-invariant flux-surface Fourier analysis in tokamaks
Matthew Pharr, Evan Bursch, Nikolas Logan +3
The Fourier spectra of resonant quantities in tokamaks depend on the choice of magnetic coordinates, and an area weighting of the Fourier integrand preserves the resonant coefficie…
Improved n=1 Empirical Error Field Penetration Threshold Scaling with Ohmic and L-Mode Conventional Tokamak Plasma Discharges
E. M. Bursch, J. K. Park, N. C. Logan +12
This paper presents an updated n=1 error field penetration threshold scaling, which increases fit quality compared to previous error field scaling laws, is produced from an expande…
Quantifying resonant drive in resistive perturbed tokamak equilibria
Matthew Pharr, Nikolas Logan, Carlos Paz-Soldan +1
Resonant drive in tokamaks is routinely quantified using a variety of different metrics that target different aspects of a resonant response to an external perturbation. Two of the…
Tearing Stability Prediction Combining Toroidal Calculations With a Two-Fluid Slab Layer
D. A. Burgess, N. C. Logan, J. -K. Park +1
A new classical TM stability simulation workflow has been developed that solves the resistive inner-layer equations in a plasma slab to yield a linear, quasi-toroidal TM growth rat…
Highest Fusion Performance without Harmful Edge Energy Bursts in Tokamak
SangKyeun Kim, Ricardo Shousha, SeongMoo Yang +20
The path of tokamak fusion and ITER is maintaining high-performance plasma to produce sufficient fusion power. This effort is hindered by the transient energy burst arising from th…
Quantification of locked mode instability triggered by a change in confinement
M. Peterka, J. Seidl, T. Markovic +24
This work presents the first analysis of the disruptive locked mode (LM) triggered by the dynamics of a confinement change. It shows that, under certain conditions, the LM threshol…