Publications related to Equilibrium pressure limits in stellarators

Effect of the tangential NBI current drive on the stability of pressure and energetic particle driven MHD modes in LHD plasma

The aim of the present study is to analyze the stability of the pressure gradient driven modes (PM) and Alfven eigenmodes (AE) in the large helical device (LHD) plasma if the rotational transform profile is modified by the current drive of the tangential n ...

IOP PUBLISHING LTD2020

Anisotropy and shaping effects on the stability boundaries of infernal ideal MHD modes in tokamak hybrid plasmas

Jonathan Graves, Wilfred Anthony Cooper, Daniele Brunetti

Anisotropy and some limiting toroidal flow effects on the stability of nearly resonant ideal magnetohydrodynamic modes in hybrid shaped tokamak plasmas are investigated within the ideal MHD infernal mode framework. Such effects are found to alter the plasm ...

2020

Nonlinear dynamics of energetic-particle driven geodesic acoustic modes in ASDEX Upgrade

Laurent Villard, Emmanuel Lanti, Alberto Bottino, Noé Thomas Elie Ohana, Emanuele Poli

Turbulence in tokamaks generates radially sheared zonal flows. Their oscillatory counterparts, geodesic acoustic modes (GAMs), appear due to the action of the magnetic field curvature. The GAMs can be driven unstable by an anisotropic energetic particle (E ...

AMER INST PHYSICS2020

Experimental verification of X-point potential well formation in unfavorable magnetic field direction

Basil Duval, Holger Reimerdes, Christian Gabriel Theiler, Joaquim Loizu Cisquella, Sophie Danielle Angelica Gorno, Claudia Colandrea, Marco Wischmeier, Cedric Kar-Wai Tsui, Mirko Wensing, Hugo De Oliveira

Recent TCV experiments confirm the predicted formation of an electric potential well, below the magnetic X-point, in configurations with unfavorable

B_t

field direction (ion

\nabla B

drift away from the divertor), that substantially reshapes the typica ...

2020

Persistent random walks of charged particles across magnetic field lines

Ambrogio Fasoli, Ivo Furno, Paolo Ricci, Marcelo Baquero Ruiz, Fabian Manke

We investigate the time evolution of the mean location and variance of a charged particle subject to random collisions that are Poisson distributed. The particle moves on a plane and is subject to a magnetic field applied perpendicular to the plane, so it ...

AMER PHYSICAL SOC2020

Nonlinear gyrokinetic PIC simulations in stellarators with the code EUTERPE

Laurent Villard, Eduardo Sanchez, Alberto Bottino

In this work, the first nonlinear particle-in-cell simulations carried out in a stellarator with the global gyrokinetic code EUTERPE using adiabatic electrons and realistic plasma parameters are reported. Several studies are conducted with the aim of enabl ...

CAMBRIDGE UNIV PRESS2020

How eigenmode self-interaction affects zonal flows and convergence of tokamak core turbulence with toroidal system size

Stephan Brunner, Justin Richard Ball, Gabriele Merlo, Julien Stanislas Pierre Dominski, Ajay Chandrarajan Jayalekshmi

Self-interaction is the process by which a microinstability eigenmode that is extended along the direction parallel to the magnetic field interacts non-linearly with itself. This effect is particularly significant in gyrokinetic simulations accounting for ...

2020

A new mechanism for filament disconnection at the X-point: poloidal shear in radial E × B velocity

Federico Nespoli, Davide Galassi

Plasma filaments generated by turbulence in the scrape-off layer are sometimes observed in experi- ments and simulations to disconnect from the target plate in the vicinity of the X-point, resulting in a “quiescent zone” with reduced fluctuations, possibly ...

2020

A Variable Structure Control Scheme Proposal for the Tokamak a Configuration Variable

Olivier Sauter, Ambrogio Fasoli, Basil Duval, Stefano Coda, Timothy Goodman, Jonathan Graves, Yves Martin, Jean-Marc Moret, Ivo Furno, Duccio Testa, Minh Quang Tran, Paolo Ricci, Patrick Blanchard, Holger Reimerdes, Benoît Labit, Jean-Philippe Hogge, Christian Gabriel Theiler, Alessandro Pau, Federico Alberto Alfredo Felici, Laurie Porte, Alexander Karpushov, Antoine Pierre Emmanuel Alexis Merle, Joan Decker, Xavier Llobet, Umar Sheikh, Cristian Galperti, Christian Schlatter, Yanis Andrebe, Rémy Jacquier, Mengdi Kong, Francesco Carpanese, Henri Weisen, Yann Camenen, Jan Horacek, Marco Wischmeier, Nicola Vianello, Federico Nespoli, Fabio Riva, Cedric Kar-Wai Tsui, Kevin Henricus Annemarie Verhaegh, Wouter Vijvers, Anna Teplukhina, Roberto Maurizio, Zhouji Huang, Francesco Sciortino, Claudio Marini, Hoang Bao Le, Oulfa Chellaï, Himank Anand, Josef Kamleitner, Joyeeta Sinha, Bernhard Sieglin, Gergely Papp

Fusion power is the most significant prospects in the long-term future of energy in the sense that it composes a potentially clean, cheap, and unlimited power source that would substitute the widespread traditional nonrenewable energies, reducing the geogr ...

2019

MHD Stability and Energy Principle for Two-Dimensional Equilibria without Assumption of Nested Magnetic Surfaces

Laurent Villard, Andrei Martynov

Abandoning the assumption of nested magnetic surfaces in tokamak plasma expands the field of research and opens up new approaches for both theoretical and experimental plasma physics. The computer code KINX for calculations of the ideal MHD stability was d ...

PLEIADES PUBLISHING INC2019

Equilibrium pressure limits in stellarators

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Effect of the tangential NBI current drive on the stability of pressure and energetic particle driven MHD modes in LHD plasma

Anisotropy and shaping effects on the stability boundaries of infernal ideal MHD modes in tokamak hybrid plasmas

Nonlinear dynamics of energetic-particle driven geodesic acoustic modes in ASDEX Upgrade

Experimental verification of X-point potential well formation in unfavorable magnetic field direction

Persistent random walks of charged particles across magnetic field lines

Nonlinear gyrokinetic PIC simulations in stellarators with the code EUTERPE

How eigenmode self-interaction affects zonal flows and convergence of tokamak core turbulence with toroidal system size

A new mechanism for filament disconnection at the X-point: poloidal shear in radial E × B velocity

A Variable Structure Control Scheme Proposal for the Tokamak a Configuration Variable

MHD Stability and Energy Principle for Two-Dimensional Equilibria without Assumption of Nested Magnetic Surfaces

Effect of the tangential NBI current drive on the stability of pressure and energetic particle driven MHD modes in LHD plasma

Anisotropy and shaping effects on the stability boundaries of infernal ideal MHD modes in tokamak hybrid plasmas

How eigenmode self-interaction affects zonal flows and convergence of tokamak core turbulence with toroidal system size

A Variable Structure Control Scheme Proposal for the Tokamak a Configuration Variable

A new mechanism for filament disconnection at the X-point: poloidal shear in radial E × B velocity

MHD Stability and Energy Principle for Two-Dimensional Equilibria without Assumption of Nested Magnetic Surfaces

Nonlinear dynamics of energetic-particle driven geodesic acoustic modes in ASDEX Upgrade

Persistent random walks of charged particles across magnetic field lines

Experimental verification of X-point potential well formation in unfavorable magnetic field direction

Nonlinear gyrokinetic PIC simulations in stellarators with the code EUTERPE