Publications related to Stability of a compact three-period stellarator with quasiaxial symmetry features

Residual stress and pinch contributions to momentum transport in JET neutral beam heated H-modes

NA broad survey of the experimental database of neutral beam heated baseline and hybrid scenarios in the JET tokamak with the C-wall was undertaken and has established the ubiquity of non-diffusive momentum transport mechanisms in externally driven, strong ...

2013

Plasma turbulence in the scrape-off layer of tokamak devices

Paolo Ricci

Plasma turbulence is explored in the scrape-off layer of tokamak devices using three-dimensional global two-fluid simulations. Two transport regimes are discussed: one in which the turbulent fluctuations saturate nonlinearly due to the Kelvin-Helmholtz ins ...

American Institute of Physics2013

Feedback control of the proximity to marginal RWM stability using active MHD spectroscopy

Holger Reimerdes

DIII-D experiments yield the first proof-of-principle results in feedback control of the proximity to the resistive wall mode (RWM) stability boundary using an active MHD spectroscopic stability measurement and neutral beam injection heating. In contrast t ...

2012

Bifurcated Helical Core Equilibrium States in Tokamaks

Olivier Sauter, Basil Duval, Stefano Coda, Jonathan Graves, Wilfred Anthony Cooper, Holger Reimerdes, Benoît Labit, Antoine Pochelon, David Pfefferlé, Federico David Halpern, Daniele Brunetti, Jonathan Rossel, Mattia Albergante

Tokamaks with weak to moderate reversed central shear in which the minimum rotational transform

q_{min}

is in the neighbourhood of unity can trigger bifurcated MagnetoHydrodynamic (MHD) equilibrium states, one of which is similar to a saturated ideal ...

2012

Pedestal Characteristics and MHD Stability of H-Mode Plasmas in TCV

Andreas Pitzschke

The tokamak à configuration variable (TCV) is unique in its ability to create a variety of plasma shapes and to heat the electron population in high density regimes using microwave power at the third harmonic of the electron cyclotron frequency. In the fra ...

EPFL2011

Real-Time Control of Tokamak Plasmas: from Control of Physics to Physics-Based Control

Federico Alberto Alfredo Felici

Stable, high-performance operation of a tokamak requires several plasma control problems to be handled simultaneously. Moreover, the complex physics which governs the tokamak plasma evolution must be studied and understood to make correct choices in contro ...

EPFL2011

Overview of physics results from NSTX

Holger Reimerdes, Mario Ludovico Podesta, Alessandro Bortolon, Anton Smirnov, Gang Yu, Maike Jaworski, Ji Hyun Kim, Bo Hu

In the last two experimental campaigns, the low aspect ratio NSTX has explored physics issues critical to both toroidal confinement physics and ITER. Experiments have made extensive use of lithium coatings for wall conditioning, correction of non-axisymmet ...

2011

The effects of sheared toroidal rotation on stability limits in tokamak plasmas

Jonathan Graves

Sheared toroidal rotation is found to increase the ideal external kink stability limit, thought to be the ultimate performance limit in fusion tokamaks. However, at rotation speeds approaching a significant fraction of the Alfv´en speed, the toroidal rotat ...

2011

MHD equilibrium and stability of tokamaks and RFP systems with 3D helical cores

Olivier Sauter, Jonathan Graves, Wilfred Anthony Cooper

Bifurcated magnetohydrodynamic (MHD) equilibrium states are computed for ITER hybrid scenario and RFX-mod SHAx configurations with very flat or reversed core magnetic shear conditions. In the ITER studies, the minimum inverse rotational transform qmin is n ...

IOP Publishing2011

Extremely Shaped Plasmas to Improve the Tokamak Concept

Francesco Piras

Energy is essential for human existence and our future depends on plentiful and accessible sources of energy. The world population is fast growing and the average energy used per capita increases. One of the greatest challenges for human beings is that of ...

EPFL2011

Stability of a compact three-period stellarator with quasiaxial symmetry features

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Residual stress and pinch contributions to momentum transport in JET neutral beam heated H-modes

Plasma turbulence in the scrape-off layer of tokamak devices

Feedback control of the proximity to marginal RWM stability using active MHD spectroscopy

Bifurcated Helical Core Equilibrium States in Tokamaks

Pedestal Characteristics and MHD Stability of H-Mode Plasmas in TCV

Real-Time Control of Tokamak Plasmas: from Control of Physics to Physics-Based Control

Overview of physics results from NSTX

The effects of sheared toroidal rotation on stability limits in tokamak plasmas

MHD equilibrium and stability of tokamaks and RFP systems with 3D helical cores

Extremely Shaped Plasmas to Improve the Tokamak Concept

Pedestal Characteristics and MHD Stability of H-Mode Plasmas in TCV

Real-Time Control of Tokamak Plasmas: from Control of Physics to Physics-Based Control

Extremely Shaped Plasmas to Improve the Tokamak Concept

Residual stress and pinch contributions to momentum transport in JET neutral beam heated H-modes

MHD equilibrium and stability of tokamaks and RFP systems with 3D helical cores

Plasma turbulence in the scrape-off layer of tokamak devices

Feedback control of the proximity to marginal RWM stability using active MHD spectroscopy

The effects of sheared toroidal rotation on stability limits in tokamak plasmas

Bifurcated Helical Core Equilibrium States in Tokamaks

Overview of physics results from NSTX