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Ben McMillan

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Related publications (48)

Page 2 of 3

Quantum chaos? Genericity and nongenericity in the MHD spectrum of nonaxisymmetric toroidal plasmas

Ben McMillan

The eigenmode spectrum is a fundamental starting point for the analysis of plasma stability and the onset of turbulence, but the characterization of the spectrum even for the simplest plasma model, ideal magnetohydrodynamics (MHD), is not fully understood. ...

2007

Global Nonlinear Electromagnetic Simulations of Tokamak Turbulence

Laurent Villard, Stephan Brunner, Trach-Minh Tran, Alberto Bottino, Sébastien Jolliet, Ben McMillan, Thibaut Vernay

The particle-in-cell code ORB5 is a global gyrokinetic turbulence simulation code in tokamak geometry. It has been developed at CRPP, Lausanne, Switzerland, with major contributions from IPP, Garching, Germany, and IPP, Greifswald, Germany, under a long-st ...

Institute of Electrical and Electronics Engineers2010

Synergy between ion temperature gradient turbulence and neoclassical processes in global gyrokinetic particle-in-cell simulations

Laurent Villard, Stephan Brunner, Trach-Minh Tran, Alberto Bottino, Sébastien Jolliet, Ben McMillan, Thibaut Vernay

Based on the CYCLONE case, simulations of collisional electrostatic ion temperature gradient (ITG) microturbulence carried out with the global gyrokinetic particle-in-cell (PIC) code ORB5 are presented. Considering adiabatic electrons, an increase in ion h ...

American Institute of Physics (AIP)2012

Interaction of large scale flow structures with gyrokinetic turbulence

Laurent Villard, Alberto Bottino, Sébastien Jolliet, Ben McMillan, Thibaut Vernay

Shear flows have a profound influence on turbulence-driven transport in tokamaks. The introduction of arbitrary initial flow profiles into the code ORB5 [Jolliet et al., Comput. Phys. Commun. 177, 409 (2007)] allows the convenient study of how flows on all ...

American Institute of Physics2011

Long global gyrokinetic simulations: Source terms and particle noise control

Laurent Villard, Trach-Minh Tran, Alberto Bottino, Ben McMillan, Sébastien Jolliet, Paolo Angelino

In global gyrokinetic simulations it takes a long time for the turbulence to reach a quasisteady state, and quantitative predictions about the quasisteady state turbulence have been difficult to obtain computationally. In particular, global particle-in-cel ...

American Institute of Physics2008

Gyrokinetic transport relations for gyroscale turbulence

Laurent Villard, Alberto Bottino, Sébastien Jolliet, Ben McMillan, Thibaut Vernay

We derive explicit local transport relations for the global gyrokinetic formalism at arbitrary wavelength. This is an extension of the analysis in Scott et. al. 2010 where this was examined in the long-wavelength limit. Deriving a local expression for the ...

IOP Publishing2012

Quasi-steady and steady states in global gyrokinetic particle-in-cell simulations

Laurent Villard, Alberto Bottino, Ben McMillan, Sébastien Jolliet, Paolo Angelino, Thibaut Vernay

Collisionless delta-f gyrokinetic particle-in-cell simulations suffer from the entropy paradox, in which the entropy grows linearly in time while low-order moments are saturated. As a consequence, these simulations do not reach a steady state and are unsui ...

American Institute of Physics (AIP)2009

The role of plasma elongation on turbulent transport in magnetically confined plasmas

Laurent Villard, Trach-Minh Tran, Alberto Bottino, Ben McMillan, Sébastien Jolliet, Paolo Angelino

The theoretical study of plasma turbulence is of central importance to fusion research. Experimental evidence indicates that the confinement time results mainly from the turbulent transport of energy, the magnitude of which depends on the turbulent state r ...

American Physical Society2009

Global simulations of tokamak microturbulence: finite beta effects and collisions

Laurent Villard, Stephan Brunner, Trach-Minh Tran, Alberto Bottino, Sébastien Jolliet, Ben McMillan, Thibaut Vernay

In this paper, we present global nonlinear gyrokinetic simulations including finite beta effects and collisions in tokamak geometry. Global electromagnetic simulations using conventional delta-f particle in cell methods are very demanding, with respect to ...

Institute of Physics2011

Parallel and lower hybrid turbulence in low beta plasmas driven by strong parallel currents and the resulting parallel electron and perpendicular ion energization

Ben McMillan

In plasmas with strong field aligned currents, the most unstable mode is not always at parallel propagation, but may be at intermediate and very oblique angles. 2D particle simulations are performed in order to examine the interaction between the plasma wa ...

2007

A locked mode indicator for disruption prediction on JET and ASDEX upgrade

Jérémie Gérard Laurent, Olivier Sauter, Ambrogio Fasoli, Henri Weisen, Richard Pitts, Jonathan Graves, Stefano Coda, Basil Duval, Timothy Goodman, Yves Martin, Yann Camenen, Jan Horacek, Javier García Hernández, Marco Wischmeier, Jean-Marc Moret, Mikhail Maslov, Patrick Blanchard, Alessandro Pau, David Pfefferlé, Davide Galassi, Federico Alberto Alfredo Felici, Roland Behn, Antonio José Pereira de Figueiredo, Jonathan Marc Philippe Faustin, Liang Yao, Dalziel Joseph Wilson, Cristian Sommariva, Benoît Labit, Hamish William Patten, Samuel Lanthaler, Holger Reimerdes, Laurie Porte, Christian Gabriel Theiler, Alberto Bottino, Marc Gruber, Alexander Karpushov, Emiliano Fable, Ben McMillan, Andrea Scarabosio, Federico Nespoli, Kevin Henricus Annemarie Verhaegh, Antoine Pierre Emmanuel Alexis Merle, Umar Sheikh, Wouter Vijvers, Matteo Fontana, Yanis Andrebe, Cristian Galperti, Haomin Sun, Joan Decker, Cedric Kar-Wai Tsui, Doohyun Kim, Nicola Vianello, Pedro Andres Molina Cabrera, Anna Teplukhina, Thomas Binderup Jensen, Zhouji Huang, Jose Vicente Sanchez Mut, Attila Bencze, Dávid Wágner, Claudio Marini, Himank Anand, Dahye Choi, Hoang Bao Le, Miguel Filipe Silva Füglister, Anton Malygin, Mélanie Preynas, Mateusz Gospodarczyk

The aim of this paper is to present a signal processing algorithm that, applied to the raw Locked Mode signal, allows us to obtain a disruption indicator in principle exploitable on different tokamaks. A common definition of such an indicator for different ...

2019

Flux- and gradient-driven global gyrokinetic simulation of tokamak turbulence

Olivier Sauter, Laurent Villard, Stephan Brunner, Ben McMillan

The Eulerian gyrokinetic turbulence code GENE has recently been extended to a full torus code. Moreover, it now provides Krook-type sources for gradient-driven simulations where the profiles are maintained on average as well as localized heat sources for a ...

2011

System size effects on gyrokinetic turbulence

Laurent Villard, Alberto Bottino, Ben McMillan, Sébastien Jolliet

The scaling of turbulence-driven heat transport with system size in magnetically confined plasmas is reexamined using first-principles based numerical simulations. Two very different numerical methods are applied to this problem, in order to resolve a long ...

The American Physical Society2010

ELM-induced cold pulse propagation in ASDEX Upgrade

Olivier Sauter, Richard Pitts, Stefano Coda, Basil Duval, Timothy Goodman, Yves Martin, Yann Camenen, Jan Horacek, Javier García Hernández, Duccio Testa, Marco Wischmeier, Jean-Marc Moret, Patrick Blanchard, Alessandro Pau, Federico Alberto Alfredo Felici, Roland Behn, Antonio José Pereira de Figueiredo, Cristian Sommariva, Benoît Labit, Holger Reimerdes, Laurie Porte, Christian Gabriel Theiler, Marc Gruber, Alexander Karpushov, Emiliano Fable, Ben McMillan, Federico Nespoli, Kevin Henricus Annemarie Verhaegh, Antoine Pierre Emmanuel Alexis Merle, Umar Sheikh, Matteo Fontana, Yanis Andrebe, Cristian Galperti, Joan Decker, Dávid Wágner, Cedric Kar-Wai Tsui, Doohyun Kim, Nicola Vianello, Pedro Andres Molina Cabrera, Anna Teplukhina, Thomas Binderup Jensen, Zhouji Huang, Attila Bencze, Claudio Marini, Wouter Vijvers, Himank Anand, Dahye Choi, Hoang Bao Le, Anton Malygin, Mélanie Preynas

In ASDEX Upgrade, the propagation of cold pulses induced by type-I edge localized modes (ELMs) is studied using electron cyclotron emission measurements, in a dataset of plasmas with moderate triangularity. It is found that the edge safety factor or the pl ...

2019

Parallel filtering in global gyrokinetic simulations

Laurent Villard, Stephan Brunner, Trach-Minh Tran, Alberto Bottino, Ben McMillan, Sébastien Jolliet, Paolo Angelino, Thibaut Vernay

In this work, a Fourier solver [B.F. McMillan, S. Jolliet, A. Bottino, P. Angelino, T.M. Tran, L Villard, Comp. Phys. Commun. 181 (2010) 7151 is implemented in the global Eulerian gyrokinetic code GT5D [Y. Idomura, H. Urano, N. Aiba, S. Tokuda, Nucl. Fusio ...

Elsevier2012

Benchmark of a semi-Lagrangian and a Lagrangian code for gyrokinetic simulations

Laurent Villard, Trach-Minh Tran, Alberto Bottino, Ben McMillan, Sébastien Jolliet, Paolo Angelino

2007

Nonlinear low noise particle-in-cell simulations of electron temperature gradient driven turbulence

Laurent Villard, Trach-Minh Tran, Alberto Bottino, Sébastien Jolliet, Ben McMillan

In this Letter, it is shown that global, nonlinear, particle-in-cell (PIC) simulations of electron temperature driven turbulence recover the same level of transport as flux-tube codes when the level of statistical noise, associated with the PIC discretizat ...

American Institute of Physics2007

Validation of the ICRF antenna coupling code RAPLICASOL against TOPICA and experiments

Telmo David Ribeiro Da Costa, Pedro Filipe Varela Saraiva, Olivier Sauter, Stefano Coda, Basil Duval, Timothy Goodman, Patrick Blanchard, Richard Pitts, Yves Martin, Javier García Hernández, Bruno Marchand, Duccio Testa, Jean-Marc Moret, Alessandro Pau, Federico Alberto Alfredo Felici, Roland Behn, Benoît Labit, Jan Horacek, Yann Camenen, Holger Reimerdes, Laurie Porte, Christian Gabriel Theiler, Marco Wischmeier, Marc Gruber, Alexander Karpushov, Antonio José Pereira de Figueiredo, Alberto Bottino, Emiliano Fable, Patrycja Nowak-Sliwinska, Doohyun Kim, Federico Nespoli, Antoine Pierre Emmanuel Alexis Merle, Andrea Scarabosio, Umar Sheikh, Wouter Vijvers, Matteo Fontana, Yanis Andrebe, Cristian Galperti, Haomin Sun, Joan Decker, Zhouji Huang, Ben McMillan, Cedric Kar-Wai Tsui, Diego Carnevale, Janir Nuno Ramos Antunes Da Cruz, Nicola Vianello, Cristian Sommariva, Pedro Andres Molina Cabrera, Anna Teplukhina, Hoang Bao Le, Kevin Henricus Annemarie Verhaegh, Jennifer Kaitlyn Olsen, Jose Vicente Sanchez Mut, Dávid Wágner, Jose Felix Vega Stavro, Lorenzo Anton-Louis Talà, Claudio Marini, Pamela Solange Valdés Undurraga, Wei Zhang, Lenke Horváth, Attila Bencze, Himank Anand, Dahye Choi, Andrea Salmi, Raffaele Tito D'Agnolo, Erwan Fabrice Koch, Hugo Antoine Georges Arnichand, Thomas Binderup Jensen, Allan Svejstrup Nielsen, Michael Oliver Reinke, Pierre Jacquot, Stefano Mattei, Daniel Molina Romero, Ana Susnjara, Anton Malygin, Mélanie Preynas, Thomas Riedl, Mateusz Gospodarczyk, Pascal Morel, Wen Bin Chng

In this paper we validate the finite element code RAPLICASOL, which models radiofrequency wave propagation in edge plasmas near ICRF antennas, against calculations with the TOPICA code. We compare the output of both codes for the ASDEX Upgrade 2-strap ante ...

IOP Publishing Ltd2019

Noise control in global gyrokinetic particle simulations

Laurent Villard, Trach-Minh Tran, Alberto Bottino, Ben McMillan, Sébastien Jolliet, Paolo Angelino

2007

Diamagnetic drift stabilized ballooning modes in a 3D heliotron

Wilfred Anthony Cooper, Ben McMillan

An analysis of kinetic ballooning modes is presented, ray trajectories for the inward shifted Large Helical Device configuration at modest $$ and with an anisotropic pressure profile due to the hot particles are evaluated and an estimate of the margi ...

IOP Publishing2012