4.4 Article

Transition from ITG to MTM linear instabilities near pedestals of high density plasmas

Related references

Note: Only part of the references are listed.
Article Physics, Fluids & Plasmas

Identifying the microtearing modes in the pedestal of DIII-D H-modes using gyrokinetic simulations

Ehab Hassan et al.

Summary: This study presents a simulation of microtearing mode (MTM) in the H-mode pedestal of an ELMy H-mode DIII-D discharge. The simulations show distinct frequency bands in the magnetic spectrogram, which correspond closely with the MTMs centered at the peak of the omega* profile. The study highlights the importance of global treatment for accurately reproducing the detailed band gaps of the low-n fluctuations.

NUCLEAR FUSION (2022)

Article Physics, Fluids & Plasmas

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

M. T. Curie et al.

Summary: 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 magnetic fluctuations, such as chirping and discrete frequency bands at noncontiguous mode numbers. The key insight underlying this model is that MTM instability is enabled by the alignment of a rational surface with the peak in the profile of the diamagnetic frequency. A fast yet accurate reduced model for MTMs enables rapid interpretation of magnetic fluctuation data from a wide range of experimental conditions to help assess the role of MTM in the pedestal.

PHYSICS OF PLASMAS (2022)

Article Physics, Fluids & Plasmas

Pedestal magnetic turbulence measurements in ELMy H-mode DIII-D plasmas by Faraday-effect polarimetry

J. Chen et al.

Summary: Internal magnetic fluctuation measurements are used to identify turbulence associated with micro-tearing modes (MTM) in the DIII-D Edge-Localized-Mode (ELM)-y H-mode pedestal. These measurements provide unique constraints for developing physics understanding and validating models of the H-mode pedestal for future devices.

PHYSICS OF PLASMAS (2021)

Article Physics, Multidisciplinary

Role of Microtearing Turbulence in DIII-D High Bootstrap Current Fraction Plasmas

X. Jian et al.

PHYSICAL REVIEW LETTERS (2019)

Article Physics, Fluids & Plasmas

Self-consistent core-pedestal transport simulations with neural network accelerated models

O. Meneghini et al.

NUCLEAR FUSION (2017)

Review Nuclear Science & Technology

Comparative H-mode density limit studies in JET and AUG

A. Huber et al.

NUCLEAR MATERIALS AND ENERGY (2017)

Article Computer Science, Interdisciplinary Applications

A high-accuracy Euleriangyrokinetic solver for collisional plasmas

J. Candy et al.

JOURNAL OF COMPUTATIONAL PHYSICS (2016)

Article Physics, Fluids & Plasmas

Integrated modeling applications for tokamak experiments with OMFIT

O. Meneghini et al.

NUCLEAR FUSION (2015)

Article Physics, Fluids & Plasmas

Electromagnetic effects on turbulent transport in high-performance ASDEX Upgrade discharges

H. Doerk et al.

PHYSICS OF PLASMAS (2015)

Article Physics, Fluids & Plasmas

Recent progress towards an advanced spherical torus operating point in NSTX

S. P. Gerhardt et al.

NUCLEAR FUSION (2011)

Article Physics, Multidisciplinary

Electromagnetic Transport from Microtearing Mode Turbulence

W. Guttenfelder et al.

PHYSICAL REVIEW LETTERS (2011)

Article Physics, Fluids & Plasmas

An Eulerian method for the solution of the multi-species drift-kinetic equation

E. A. Belli et al.

PLASMA PHYSICS AND CONTROLLED FUSION (2009)

Article Physics, Fluids & Plasmas

Micro-tearing modes in the mega ampere spherical tokamak

D. J. Applegate et al.

PLASMA PHYSICS AND CONTROLLED FUSION (2007)

Review Physics, Fluids & Plasmas

Recent progress on the development and analysis of the ITPA global H-mode confinement database

D. C. McDonald et al.

NUCLEAR FUSION (2007)

Article Physics, Fluids & Plasmas

Impact of the α parameter on the microstability of internal transport barriers

C Bourdelle et al.

NUCLEAR FUSION (2005)

Review Physics, Fluids & Plasmas

Density limits in toroidal plasmas

M Greenwald

PLASMA PHYSICS AND CONTROLLED FUSION (2002)

Article Physics, Fluids & Plasmas

The ITER design

R Aymar et al.

PLASMA PHYSICS AND CONTROLLED FUSION (2002)

Article Physics, Fluids & Plasmas

The effect of plasma shape on H-mode pedestal characteristics on DIII-D

TH Osborne et al.

PLASMA PHYSICS AND CONTROLLED FUSION (2000)