Publications related to Comparison of linear and nonlinear plasma response models for non-axisymmetric perturbations

Plug-and-Play Decentralized Model Predictive Control for Linear Systems

Giancarlo Ferrari Trecate, Marcello Farina

In this paper we consider a linear system structured into physically coupled subsystems and propose a decentralized control scheme capable to guarantee asymptotic stability and satisfaction of constraints on system inputs and states. The design procedure i ...

2013

Edge Localized Mode Control in TCV

Jonathan Rossel

The Tokamak concept, based on magnetic confinement of a hydrogen plasma, is one of today's most promising paths to energy production by nuclear fusion. The experimental scenarios leading to the largest fusion rate are based on a high confinement plasma reg ...

EPFL2012

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

Kalman Filtering for a Generalized Class of Nonlinear Systems and a New Gaussian Quadrature Technique

The class of nonlinear systems treated in this technical note consists of the discrete time nonlinear systems that are formed by the interconnection of linear systems through static nonlinearities with few inputs. This special structure is exploited to red ...

Ieee-Inst Electrical Electronics Engineers Inc2012

Response of a resistive and rotating tokamak to external magnetic perturbations below the Alfvén frequency

Holger Reimerdes

Motivated by the recent experimental observation that plasma stability can be improved by external magnetic perturbations, the general problem of plasma response to external magnetic perturbations is investigated. Different (vacuum, ideal and resistive) pl ...

2011

Physics design of a saddle coil system for TCV

Yves Martin, Jean-Marc Moret, Jonathan Rossel

The upgrade project for TCV (Tokamak à Configuration Variable) includes the installation of a set of saddle coils, namely the saddle coil system (SCS), located and powered such as to create a helical magnetic perturbation. Using independent power supplies, ...

Elsevier2011

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

Macroscopic Stability of High Beta MAST plasmas

Jonathan Graves, Wilfred Anthony Cooper

The high-beta capability of the spherical tokamak, coupled with a suite of world-leading diagnostics on MAST, has facilitated significant improvements in the understanding of performance-limiting core instabilities in high performance plasmas. For instance ...

IOP2011

Frictionless electrostatic rotary stepper micromotor for microrobotic applications

Marc Stranczl

We present the modeling and experimental characterization of a monolithic 3-phase rotary stepper micromotor which employs a flexure suspension to guide the rotor. The monolithic structure avoids any frictional contact during operation, providing a precise, ...

2011

Direct Measurements of the Damping of Alfvén Eigenmodes for an Assessment of their Stability Limits in Tokamak Plasmas

Theodoros Panis

Direct damping rate measurements of AEs are obtained using the active MHD spectroscopy system installed on the JET tokamak. The system was recently equipped with new antennas, designed to study especially the modes of intermediate toroidal mode number n, | ...

EPFL2010

Comparison of linear and nonlinear plasma response models for non-axisymmetric perturbations

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Plug-and-Play Decentralized Model Predictive Control for Linear Systems

Edge Localized Mode Control in TCV

Bifurcated Helical Core Equilibrium States in Tokamaks

Kalman Filtering for a Generalized Class of Nonlinear Systems and a New Gaussian Quadrature Technique

Response of a resistive and rotating tokamak to external magnetic perturbations below the Alfvén frequency

Physics design of a saddle coil system for TCV

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

Macroscopic Stability of High Beta MAST plasmas

Frictionless electrostatic rotary stepper micromotor for microrobotic applications

Direct Measurements of the Damping of Alfvén Eigenmodes for an Assessment of their Stability Limits in Tokamak Plasmas

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

Edge Localized Mode Control in TCV

Response of a resistive and rotating tokamak to external magnetic perturbations below the Alfvén frequency

Kalman Filtering for a Generalized Class of Nonlinear Systems and a New Gaussian Quadrature Technique

Direct Measurements of the Damping of Alfvén Eigenmodes for an Assessment of their Stability Limits in Tokamak Plasmas

Plug-and-Play Decentralized Model Predictive Control for Linear Systems

Physics design of a saddle coil system for TCV

Bifurcated Helical Core Equilibrium States in Tokamaks

Macroscopic Stability of High Beta MAST plasmas

Frictionless electrostatic rotary stepper micromotor for microrobotic applications