Robust avoidance of edge-localized modes alongside gradient formation in the negative triangularity tokamak edge

AO Nelson, L Schmitz, C Paz-Soldan, KE Thome… - Physical Review Letters, 2023 - APS
In a series of high performance diverted discharges on DIII-D, we demonstrate that strong
negative triangularity (NT) shaping robustly suppresses all edge-localized mode (ELM) …

Orchestrating TRANSP simulations for interpretative and predictive tokamak modeling with OMFIT

BA Grierson, X Yuan, M Gorelenkova… - Fusion Science and …, 2018 - Taylor & Francis
TRANSP simulations are being used in the OMFIT workflow manager to enable a machine-
independent means of experimental analysis, postdictive validation, and predictive time …

CAKE: consistent automatic kinetic equilibrium reconstruction

ZA Xing, D Eldon, AO Nelson, MA Roelofs… - Fusion Engineering and …, 2021 - Elsevier
Magnetohydrodynamic equilibrium reconstructions with kinetic constraints are an essential
input of many tokamak stability and transport analysis workflows. The reconstructions …

The effect of plasma shape and neutral beam mix on the rotation threshold for RMP-ELM suppression

C Paz-Soldan, R Nazikian, L Cui, BC Lyons… - Nuclear …, 2019 - iopscience.iop.org
Varying the neutral beam injection (NBI) mix reveals a clear pedestal-top rotation threshold
for edge localized mode (ELM) suppression by resonant magnetic perturbations (RMPs) …

Time-dependent experimental identification of inter-ELM microtearing modes in the tokamak edge on DIII-D

AO Nelson, FM Laggner, A Diallo, D Smith… - Nuclear …, 2021 - iopscience.iop.org
In a series of discharges on the DIII-D tokamak, fast vertical plasma jogs are used to induce
current perturbations in the steep gradient region of the H-mode edge. These current …

Main ion and impurity edge profile evolution across the L-to H-mode transition on DIII-D

SR Haskey, BA Grierson, C Chrystal… - Plasma Physics and …, 2018 - iopscience.iop.org
Detailed measurements of the main ion (${D}^{+} $) and impurity ion (${C}^{6+} $) evolution
during the development of the H-mode pedestal across an L–H transition show significant …

[HTML][HTML] Active spectroscopy measurements of the deuterium temperature, rotation, and density from the core to scrape off layer on the DIII-D tokamak

SR Haskey, BA Grierson, L Stagner… - Review of Scientific …, 2018 - pubs.aip.org
Main-ion charge exchange recombination spectroscopy (MICER) uses the neutral beam
induced D α spectrum to measure the local deuterium ion (D+) temperature, rotation, and …

Central ion cyclotron emission in the DIII-D tokamak

KE Thome, DC Pace, RI Pinsker… - Nuclear …, 2019 - iopscience.iop.org
Collective ion cyclotron emission (ICE) at the ion cyclotron frequency and its harmonics is a
potential passive diagnostic of the fast-ion distribution in fusion reactors. ICE is observed in …

Role of microtearing turbulence in DIII-D high bootstrap current fraction plasmas

X Jian, C Holland, J Candy, E Belli, V Chan… - Physical review …, 2019 - APS
We report on the first direct comparisons of microtearing turbulence simulations to
experimental measurements in a representative high bootstrap current fraction (f BS) …

Neural-network accelerated coupled core-pedestal simulations with self-consistent transport of impurities and compatible with ITER IMAS

O Meneghini, G Snoep, BC Lyons… - Nuclear …, 2020 - iopscience.iop.org
An integrated modeling workflow capable of finding the steady-state plasma solution with
self-consistent core transport, pedestal structure, current profile, and plasma equilibrium …