Publications related to Drift Stabilisation of Ballooning Modes in an Inward-Shifted LHD Configuration

Stability of Tokamak and RFP Plasmas with an Extended Region of Low Magnetic Shear

It has been observed experimentally that magnetically confined plasmas, characterised by the safety factor q with a small or slightly inverted magnetic shear, have good confinement properties. Such plasmas typically have no internal transport barrier, oper ...

EPFL2015

Turbulent regimes in the tokamak scrape-off layer

Annamaria Mosetto

The tokamak scrape-off layer (SOL) is the plasma region characterized by open field lines that start and end on the vessel walls. The plasma dynamics in the SOL plays a crucial role in determining the overall performance of a tokamak, since it controls the ...

EPFL2014

Turbulent regimes in the tokamak scrape-off layer

Paolo Ricci, Joaquim Loizu Cisquella, Sébastien Jolliet, Federico David Halpern, Annamaria Mosetto

We identify the turbulent regimes in the tokamak scrape-off layer as a function of plasma resistivity, electron to ion mass ratio, safety factor, and magnetic shear. We find that two main instabilities drive turbulence in the SOL: Drift Waves, with their r ...

2013

Microphysics of Cosmic Plasmas: Hierarchies of Plasma Instabilities from MHD to Kinetic

Ivo Furno

In this article, we discuss the idea of a hierarchy of instabilities that can rapidly couple the disparate scales of a turbulent plasma system. First, at the largest scale of the system, L, current carrying flux ropes can undergo a kink instability. Second ...

Springer2013

A comprehensive study of electrostatic turbulence and transport in the laboratory basic plasma physics device TORPEX

Ambrogio Fasoli, Ivo Furno, Paolo Ricci, Benoît Labit, Christian Gabriel Theiler, Joaquim Loizu Cisquella, Fabio Avino, Kyle Gustafson, Alexandre Dominique Bovet, Davoud Iraji

TORPEX is a toroidal device located at the CRPP-EPFL in Lausanne. In TORPEX, a vertical magnetic field superposed on a toroidal field creates helicoidal field lines with both ends terminating on the torus vessel. The turbulence driven by magnetic curvature ...

2012

Boundary conditions for plasma fluid models at the magnetic presheath entrance

Paolo Ricci, Joaquim Loizu Cisquella, Sébastien Jolliet, Federico David Halpern

The proper boundary conditions at the magnetic presheath entrance for plasma fluid turbulence models based on the drift approximation are derived, focusing on a weakly collisional plasma sheath with Ti≪Te and a magnetic field oblique to a totally absorbing ...

American Institute of Physics2012

Global scrape-off layer electromagnetic fluid turbulence simulations

Paolo Ricci, Joaquim Loizu Cisquella, Sébastien Jolliet, Federico David Halpern, Annamaria Mosetto

Electromagnetic effects play a key role in tokamak edge turbulence. It has been suggested that the density limit and the L to H mode transition may both be due to an interplay between electromagnetic effects, diamagnetic flows and collisionality. (See, e.g ...

2012

Drift stabilization of ballooning modes in an inward-Shifted LHD configuration

Jonathan Graves, Wilfred Anthony Cooper, Lucie Brocher

A drift-magnetohydrodynamic theory is applied to a background anisotropic pressure equilibrium state to generate a drift corrected ballooning mode equation. The ratio of the mode frequency to the hot particle drift frequency constitutes the critical expans ...

Wiley-VCH2010

Drift stabilization of ballooning modes in a high-$\langle \beta \rangle$ LHD configuration

Jonathan Graves, Wilfred Anthony Cooper, Lucie Brocher

Ideal MHD yields at best inconclusive predictions about the stability of the LHD heliotron for

\langle \beta \rangle \geq 3\%

. We investigate the impact of the drift stabilization of ballooning modes for the inward shifted LHD configuration (vacuum magne ...

2010

Active excitation and damping rate measurement of intermediate-n Toroidal Alfvén Eigenmodes in JET, C-Mod and MAST plasmas

Ambrogio Fasoli, Duccio Testa, Theodoros Panis

The stability properties of Alfvén Eigenmodes (AEs) are investigated directly using external antenna excitation and detection of stable modes in a variety of plasma configurations in different devices. Dedicated methods to measure the AE damping rate separ ...

2010

Drift Stabilisation of Ballooning Modes in an Inward-Shifted LHD Configuration

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Stability of Tokamak and RFP Plasmas with an Extended Region of Low Magnetic Shear

Turbulent regimes in the tokamak scrape-off layer

Turbulent regimes in the tokamak scrape-off layer

Microphysics of Cosmic Plasmas: Hierarchies of Plasma Instabilities from MHD to Kinetic

A comprehensive study of electrostatic turbulence and transport in the laboratory basic plasma physics device TORPEX

Boundary conditions for plasma fluid models at the magnetic presheath entrance

Global scrape-off layer electromagnetic fluid turbulence simulations

Drift stabilization of ballooning modes in an inward-Shifted LHD configuration

Drift stabilization of ballooning modes in a high-$\langle \beta \rangle$ LHD configuration

Active excitation and damping rate measurement of intermediate-n Toroidal Alfvén Eigenmodes in JET, C-Mod and MAST plasmas

Turbulent regimes in the tokamak scrape-off layer

A comprehensive study of electrostatic turbulence and transport in the laboratory basic plasma physics device TORPEX

Global scrape-off layer electromagnetic fluid turbulence simulations

Turbulent regimes in the tokamak scrape-off layer

Stability of Tokamak and RFP Plasmas with an Extended Region of Low Magnetic Shear

Microphysics of Cosmic Plasmas: Hierarchies of Plasma Instabilities from MHD to Kinetic

Boundary conditions for plasma fluid models at the magnetic presheath entrance

Drift stabilization of ballooning modes in an inward-Shifted LHD configuration

Drift stabilization of ballooning modes in a high-$\langle \beta \rangle$ LHD configuration

Active excitation and damping rate measurement of intermediate-n Toroidal Alfvén Eigenmodes in JET, C-Mod and MAST plasmas