113 citations · 632 across the 18 of their papers we have counts for
18 papers
Gaussian Process Regression models for the properties of micro-tearing modes in spherical tokamak
William Hornsby, Ander Gray, James Buchanan +9
Spherical tokamaks (STs) have many desirable features that make them an attractive choice for a future fusion power plant. Power plant viability is intrinsically related to plasma…
Electromagnetic gyrokinetic instabilities in STEP
Daniel Kennedy, Maurizio Giacomin, Francis J Casson +4
We present herein the results of a linear gyrokinetic analysis of electromagnetic microinstabilites in the conceptual high-, reactor-scale, tight-aspect-ratio tokamak STEP (Sphe…
On electromagnetic turbulence and transport in STEP
Maurizio Giacomin, Daniel Kennedy, Francis J Casson +4
In this work, we present first-of-their-kind nonlinear local gyrokinetic simulations of electromagnetic turbulence at mid-radius in the burning plasma phase of the conceptual high-…
Integrated modelling and multiscale gyrokinetic validation study of ETG turbulence in a JET hybrid H-mode scenario
J Citrin, S Maeyama, C Angioni +11
Previous studies with first-principle-based integrated modelling suggested that ETG turbulence may lead to an anti-GyroBohm isotope scaling in JET high-performance hybrid H-mode sc…
Application of Gaussian process regression to plasma turbulent transport model validation via integrated modelling
Aaron Ho, Jonathan Citrin, Fulvio Auriemma +7
This paper outlines an approach towards improved rigour in tokamak turbulence transport model validation within integrated modelling. Gaussian process regression (GPR) techniques w…
Neural network surrogate of QuaLiKiz using JET experimental data to populate training space
Aaron Ho, Jonathan Citrin, Clarisse Bourdelle +5
Within integrated tokamak plasma modelling, turbulent transport codes are typically the computational bottleneck limiting their routine use outside of post-discharge analysis. Neur…
Multiple-isotope pellet cycles captured by turbulent transport modelling in the JET tokamak
M. Marin, J. Citrin, L. Garzotti +8
For the first time the pellet cycle of a multiple-isotope plasma is successfully reproduced with reduced turbulent transport modelling, within an integrated simulation framework. F…
Fast modeling of turbulent transport in fusion plasmas using neural networks
Karel Lucas van de Plassche, Jonathan Citrin, Clarisse Bourdelle +7
We present an ultrafast neural network (NN) model, QLKNN, which predicts core tokamak transport heat and particle fluxes. QLKNN is a surrogate model based on a database of 300 mill…
Tractable flux-driven temperature, density, and rotation profile evolution with the quasilinear gyrokinetic transport model QuaLiKiz
J Citrin, C Bourdelle, F J Casson +14
Quasilinear turbulent transport models are a successful tool for prediction of core tokamak plasma profiles in many regimes. Their success hinges on the reproduction of local nonli…
On seed island generation and the non-linear self-consistent interaction of the tearing mode with electromagnetic gyro-kinetic turbulence
William Hornsby, Pierluigi Migliano, Rico Buchholz +4
The multi-scale interaction of self-consistently driven magnetic islands with electromagnetic turbulence is studied within the three dimensional, toroidal gyro-kinetic framework. I…
The linear tearing instability in three dimensional, toroidal gyrokinetic simulations
William Hornsby, Pierluigi Migliano, Rico Bucholz +5
Linear gyro-kinetic simulations of the classical tearing mode in three-dimensional toroidal geometry were performed using the global gyro kinetic turbulence code, GKW . The results…
Effect of turbulence on electron cyclotron current drive and heating in ITER
F. J. Casson, E. Poli, C. Angioni +2
Non-linear local electromagnetic gyrokinetic turbulence simulations of the ITER standard scenario H-mode are presented for the q=3/2 and q=2 surfaces. The turbulent transport is ex…
Nonlinear seed island generation by three-dimensional electromagnetic, gyrokinetic turbulence
William Hornsby, Pierluigi Migliano, Rico Buchholz +4
Turbulence is shown to be critical to the onset and evolution of the neoclassical tearing mode, affecting both its growth and rotation. The interaction is here studied for the firs…
Angular momentum transport modeling: achievements of a gyrokinetic quasi-linear approach
P. Cottier, C. Bourdelle, Y. Camenen +5
QuaLiKiz, a model based on a local gyrokinetic eigenvalue solver is expanded to include momentum flux modeling in addition to heat and particle fluxes. Essential for accurate momen…
Analysis of Lithium Driven Electron Density Peaking in FTU Liquid Lithium Limiter Experiments
G. Szepesi, M. Romanelli, F. Militello +7
The impact of lithium impurities on the microstability and turbulent transport characteristics in the core of a typical FTU Liquid Lithium Limiter (LLL)(Mazzitelli et al., Nucl. Fu…
Toroidal momentum transport in a tokamak caused by symmetry breaking parallel derivatives
Tobias Sung, Rico Buchholz, Francis Casson +5
A new mechanism for toroidal momentum transport in a tokamak is investigated using the gyro-kinetic model. First, an analytic model is developed through the use of the ballooning t…
Ion temperature gradient instability at sub-Larmor radius scales with non-zero ballooning angle
Pierluigi Migliano, Yann Camenen, Francis Casson +2
Linear gyro-kinetic stability calculations predict unstable toroidal Ion Temperature Gradient modes with normalised poloidal wave vectors well above one () for standard…
Validation of gyrokinetic modelling of light impurity transport including rotation in ASDEX Upgrade
F. J. Casson, R. M. McDermott, C. Angioni +9
Upgraded spectroscopic hardware and an improved impurity concentration calculation allow accurate determination of boron density in the ASDEX Upgrade tokamak. A database of boron m…