Publications by Holger Reimerdes

Bifurcated Helical Core Equilibrium States in Tokamaks

Olivier Sauter, Basil Duval, Stefano Coda, Jonathan Graves, Wilfred Anthony Cooper, Holger Reimerdes, Benoît Labit, Antoine Pochelon, Trach-Minh Tran, David Pfefferlé, Federico David Halpern, Daniele Brunetti

Tokamaks with weak to moderate reversed central shear in which the minimum inverse rotational transform (safety factor) qmin is in the neighbourhood of unity can trigger bifurcated magnetohydrodynamic equilibrium states, one of which is similar to a satura ...

IOP Publishing2013

Non-linear magnetic perturbations during edge-localized modes in TCV dominated by low n mode components

Olivier Sauter, Holger Reimerdes, Hartmut Zohm

Edge-localized modes (ELMs) are instabilities in the edge of tokamak plasmas in the high confinement regime (H-mode). Despite beneficial aspects of ELMs, in a future device the size of the energy loss per ELM must be controlled, in order to avoid intolerab ...

Iop Publishing Ltd2013

Fast seeding of NTMs by sawtooth crashes in TCV and their preemption using ECRH

Olivier Sauter, Basil Duval, Timothy Goodman, Jonathan Graves, Duccio Testa, Holger Reimerdes, Antoine Pochelon

Many tokamaks have observed that sawteeth of sufficient duration may trigger neoclassical tearing modes (NTMs) that lead to plasma performance degradation. In this paper, TCV's ability to accurately control the period of individual sawteeth is exploited, u ...

Iop Publishing Ltd2013

Power distribution in the snowflake divertor in TCV

Basil Duval, Stefano Coda, Holger Reimerdes, Benoît Labit, Federico Nespoli, Wouter Vijvers

TCV experiments demonstrate the basic power exhaust properties of the snowflake (SF) plus and SF minus divertor configurations by measuring the heat fluxes at each of their four divertor legs. The measurements indicate an enhanced transport into the privat ...

Iop Publishing Ltd2013

Resonant features of energy and particle transport during application of resonant magnetic perturbation fields at TEXTOR and DIII-D

Holger Reimerdes

In this paper, results of a direct comparison of TEXTOR and DIII-D experiments with resonant magnetic perturbation (RMP) fields are presented. This comparison of resistive L-mode plasmas at TEXTOR with highly conductive H-mode plasmas at DIII-D is useful t ...

2012

Optimization of the snowflake diverted equilibria in the TCV tokamak

Olivier Sauter, Yves Martin, Laurent Villard, Jean-Marc Moret, Holger Reimerdes, Antoine Pochelon, Francesco Piras, Andrei Martynov

In support of the TCV experimental campaign aiming at studying H-mode plasmas with snowﬂake (SF) divertor, free boundary equilibrium and stability studies were performed with the SPIDER and KINX codes. Due to the high ﬂexibility of plasma sha ...

European Physical Society2012

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

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

ELM pacing using modulated non-axisymmetric magnetic fields on DIII-D

Holger Reimerdes

Edge localized mode (ELM) pacing using modulated n = 3 non-axisymmetric fields has been demonstrated on DIII-D over a wide range of conditions, including significant variations in temperature, β N, density and shape. At low collisionality, the pacing resul ...

2012

Changes in particle transport as a result of resonant magnetic perturbations in DIII-D

Holger Reimerdes

In this paper, we introduce the first direct perturbed particle transport measurements in resonant magnetic perturbation (RMP) H-mode plasmas. The perturbed particle transport increases as a result of application of RMP deep into the core. In the core, a l ...

American Institute of Physics2012

Holger Reimerdes

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Bifurcated Helical Core Equilibrium States in Tokamaks

Non-linear magnetic perturbations during edge-localized modes in TCV dominated by low n mode components

Fast seeding of NTMs by sawtooth crashes in TCV and their preemption using ECRH

Power distribution in the snowflake divertor in TCV

Resonant features of energy and particle transport during application of resonant magnetic perturbation fields at TEXTOR and DIII-D

Optimization of the snowflake diverted equilibria in the TCV tokamak

Bifurcated Helical Core Equilibrium States in Tokamaks

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

ELM pacing using modulated non-axisymmetric magnetic fields on DIII-D

Changes in particle transport as a result of resonant magnetic perturbations in DIII-D

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

Resonant features of energy and particle transport during application of resonant magnetic perturbation fields at TEXTOR and DIII-D

Bifurcated Helical Core Equilibrium States in Tokamaks

Non-linear magnetic perturbations during edge-localized modes in TCV dominated by low n mode components

Optimization of the snowflake diverted equilibria in the TCV tokamak

Fast seeding of NTMs by sawtooth crashes in TCV and their preemption using ECRH

Changes in particle transport as a result of resonant magnetic perturbations in DIII-D

Power distribution in the snowflake divertor in TCV

ELM pacing using modulated non-axisymmetric magnetic fields on DIII-D

Bifurcated Helical Core Equilibrium States in Tokamaks