Elements of H-mode pedestal structure

RJ Groebner, S Saarelma - Plasma Physics and Controlled …, 2023 - iopscience.iop.org
This paper reviews current understanding of key physics elements that control the H-mode
pedestal structure, which exists at the boundary of magnetically confined plasmas. The …

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) …

Simultaneous access to high normalized density, current, pressure, and confinement in strongly-shaped diverted negative triangularity plasmas

C Paz-Soldan, C Chrystal, P Lunia, AO Nelson… - Nuclear …, 2024 - iopscience.iop.org
Strongly-shaped diverted negative triangularity (NT) plasmas in the DIII-D tokamak
demonstrate simultaneous access to high normalized density, current, pressure, and …

Prospects for H-mode inhibition in negative triangularity tokamak reactor plasmas

AO Nelson, C Paz-Soldan, S Saarelma - Nuclear Fusion, 2022 - iopscience.iop.org
Instability to high toroidal mode number (n) ballooning modes has been proposed as the
primary gradient-limiting mechanism for tokamak equilibria with negative triangularity …

[HTML][HTML] A survey of pedestal magnetic fluctuations using gyrokinetics and a global reduced model for microtearing stability

MT Curie, JL Larakers, DR Hatch, AO Nelson… - Physics of …, 2022 - pubs.aip.org
This article presents a global reduced model for slab-like microtearing modes (MTMs) in the
H-mode pedestal, which reproduces distinctive features of experimentally observed …

On electromagnetic turbulence and transport in STEP

M Giacomin, D Kennedy, FJ Casson… - Plasma Physics and …, 2024 - iopscience.iop.org
In this work, we present first-of-their-kind nonlinear local gyrokinetic (GK) simulations of
electromagnetic turbulence at mid-radius in the burning plasma phase of the conceptual …

Three-dimensional inhomogeneity of electron-temperature-gradient turbulence in the edge of tokamak plasmas

JF Parisi, FI Parra, CM Roach, MR Hardman… - Nuclear …, 2022 - iopscience.iop.org
Nonlinear multiscale gyrokinetic simulations of a Joint European Torus edge pedestal are
used to show that electron-temperature-gradient (ETG) turbulence has a rich three …

Gyrokinetic analysis of inter-edge localized mode transport mechanisms in a DIII-D pedestal

MR Halfmoon, DR Hatch, MT Kotschenreuther… - Physics of …, 2022 - pubs.aip.org
In this study, gyrokinetic simulations are used to study pedestal fluctuations for DIII-D
discharge 174082 using the GENE code. Nonlinear local simulations indicate that electron …

Micro-tearing mode dominated electron heat transport in DIII-D H-mode pedestal

J Chen, X Jian, DL Brower, SR Haskey, Z Yan… - Nuclear …, 2023 - iopscience.iop.org
A new, comprehensive set of evidence reveals that Micro-Tearing Modes (MTMs) dominate
pedestal electron heat transport in an H-mode experiment in the DIII-D tokamak. The …

Classification of Edge Instabilities at Globus-M2 Tokamak

VV Solokha, GS Kurskiev, AY Yashin… - Plasma Physics …, 2023 - Springer
Among the peripheral instabilities observed at the Globus-M2 tokamak, two types of edge
localized modes (ELMs) are brought into focus: ELMs synchronized and desynchronized …