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Holger Reimerdes

Cette personne a quitté l’EPFL

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Publications associées (127)

Page 5 sur 7

Overview of physics results from MAST upgrade towards core-pedestal-exhaust integration

Olivier Sauter, Holger Reimerdes, Christian Gabriel Theiler, Federico Alberto Alfredo Felici, Matteo Vallar, Samuele Mazzi

Recent results from MAST Upgrade are presented, emphasising understanding the capabilities of this new device and deepening understanding of key physics issues for the operation of ITER and the design of future fusion power plants. The impact of MHD instab ...

IOP Publishing Ltd2024

The DTT device: Rationale for the choice of the parameters

Basil Duval, Holger Reimerdes

The main goal of the Divertor Tokamak Test facility (DTT) is to explore alternative power exhaust solutions for the next step after ITER, i.e., a demonstration power plant DEMO that will explore steady-state operation.The principal objective of DTT is to m ...

Elsevier Science Sa2017

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

Edge plasma turbulence simulations in detached regimes with the SOLEDGE3X code

Holger Reimerdes, Davide Mancini

Experimental results from several tokamaks suggest a strong impact of divertor density regimes on turbulent transport in the edge plasma. Reciprocally, the change in cross- field transport and Scrape-Off-Layer (SOL) width affects the access to density regi ...

Elsevier2024

Recent TCV results – innovative plasma shaping to improve plasma properties and insight

Olivier Sauter, Stefano Coda, Laurent Villard, Basil Duval, Timothy Goodman, Antoine Pochelon, Holger Reimerdes, Jean-Marc Moret, Stephan Brunner, Benoît Labit, Laurie Porte, Alberto Bottino, Alexander Karpushov, Sébastien Jolliet, Paolo Angelino, Alessandro Marinoni, Dávid Wágner, Jonathan Rossel, David Nicholas Wagner, Andreas Pitzschke

2012

Benchmark of a self-consistent dynamic 1D divertor model DIV1D using the 2D SOLPS-ITER code

Holger Reimerdes, Mirko Wensing

This paper presents DIV1D, a new 1D dynamic physics-based model of the divertor plasma under development to study and control the dynamics of detached plasmas. An innovative feature of DIV1D is that it mimics cross-field transport using an effective flux e ...

2022

Preliminary analysis of alternative divertors for DEMO

Paolo Ricci, Holger Reimerdes, Marco Wischmeier, Fabio Riva, Mirko Wensing

A physics and engineering analysis of alternative divertor configurations is carried out by examining benefits and problems by comparing the baseline single null solution with a Snowflake, an X- and a Super-X divertor. It is observed that alternative confi ...

Elsevier2021

H-mode access during plasma current ramp-up in TCV

Yves Martin, Ivo Furno, Holger Reimerdes, Benoît Labit, Roland Behn

A recent TCV experiment has investigated the dependence of the L H transition threshold power on the plasma current ramp-rate and the X-point height above the divertor target, which both have previously been seen to affect the transition behaviour. Systema ...

Iop Publishing Ltd2014

Overview of the TCV tokamak program: scientific progress and facility upgrades

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

IOP Publishing Ltd2017

European roadmap to the realization of fusion energy: Mission for solution on heat-exhaust systems

Holger Reimerdes

Horizon 2020 is the largest EU Research and Innovation programme to date. The European fusion research programme for Horizon 2020 is outlined in the "Roadmap to the realization of fusion energy" and published in 2012 [1]. As part of it, the European Fusion ...

Elsevier Science Sa2015

Effect of plasma geometry on divertor heat flux spreading: MONALISA simulations and experimental results from TCV

Holger Reimerdes, Benoît Labit, Christian Gabriel Theiler, Federico Nespoli, Roberto Maurizio

Safe ITER operations will rely on power spreading to keep the peak heat flux within divertor material constraints. A solid understanding and parameterization of heat flux profiles is therefore mandatory. This paper focuses on the impact of plasma geometry ...

Elsevier2017

X-point potential well formation in diverted tokamaks with unfavorable magnetic field direction

Basil Duval, Marco Wischmeier, Holger Reimerdes, Joaquim Loizu Cisquella, Mirko Wensing

Fluid simulations of the boundary of fusion plasmas predict the formation of an electric potential well in the vicinity of the X-point in detached divertor conditions with Bt in the unfavorable direction for H-mode access. This potential well arises when t ...

IOP Publishing Ltd2020

Numerical study of potential heat flux mitigation effects in the TCV snowflake divertor

Basil Duval, Holger Reimerdes, Benoît Labit, Marco Wischmeier, Wouter Vijvers

We report on EMC3-Eirene simulations of the plasma and neutral particle transport the TCV boundary layer of a series of snowflake (SF) equilibria characterized by the normalized poloidal flux coordinate rho(x2) of the secondary X-point x(2). We refer to a ...

2016

Enhanced (E)over-right-arrow x (B)over-right-arrow drift effects in the TCV snowflake divertor

Basil Duval, Holger Reimerdes, Benoît Labit, Wouter Vijvers

Measurements of various plasma parameters at the divertor targets of snowflake (SF) and conventional single-null configurations indicate an enhanced effect of the (E) over right arrow x (B) over right arrow drift in the scrape-off layer of plasmas in the S ...

IOP Publishing Ltd2015

An upper pressure limit for low-Z benign termination of runaway electron beams in TCV

Stefano Coda, Basil Duval, Holger Reimerdes, Umar Sheikh, Joan Decker, Claudia Colandrea, Luke Simons, Benjamin Alexandre Vincent, Martim Zurita, Marta Mariarmanda Pedrini

We present a model for the particle balance in the post-disruption runaway electron plateau phase of a tokamak discharge. The model is constructed with the help of, and applied to, experimental data from TCV discharges investigating the so-called 'low-Z be ...

IOP Publishing Ltd2025

A spectroscopic inference and SOLPS-ITER comparison of flux-resolved edge plasma parameters in detachment experiments on TCV

Basil Duval, Holger Reimerdes, Christian Gabriel Theiler, Kevin Henricus Annemarie Verhaegh, Mirko Wensing, Artur Perek

This work presents the use of a collisional-radiative model to infer plasma parameters from 2D emissivities of several deuterium Balmer lines. The emissivities were obtained by MANTIS, an absolutely calibrated, ten-camera imaging polychromator with

IOP Publishing Ltd2022

SOLPS-ITER validation with TCV L-mode discharges

Basil Duval, Patrick Blanchard, Holger Reimerdes, Christian Gabriel Theiler, Marco Wischmeier, Cedric Kar-Wai Tsui, Kevin Henricus Annemarie Verhaegh, Mirko Wensing, Marcelo Baquero Ruiz, Artur Perek, Hugo De Oliveira, Filippo Bagnato, Lorenzo Martinelli, Sophie Danielle Angelica Gorno, Claudia Colandrea

This work presents a quantitative test of SOLPS-ITER simulations against tokamak a configuration variable (TCV) L-mode experiments. These simulations account for drifts, currents, kinetic neutrals, and carbon impurities providing the most complete edge tra ...

2021

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

Initial TCV operation with a baffled divertor

Ambrogio Fasoli, Basil Duval, Jean-Marc Moret, Duccio Testa, Patrick Blanchard, Christian Gabriel Theiler, Davide Galassi, Holger Reimerdes, Umar Sheikh, Cedric Kar-Wai Tsui, Matthieu Toussaint, Roberto Maurizio, Mirko Wensing, Marcelo Baquero Ruiz, Artur Perek, Hugo De Oliveira, Filippo Bagnato, Lorenzo Martinelli, Sophie Danielle Angelica Gorno, Claudia Colandrea, Harshita Raj

The Tokamak à Configuration Variable (TCV) tokamak is in the midst of an upgrade to further its capability to investigate conventional and alternative divertor configurations. To that end, modular and removable gas baffles have been installed to decrease t ...

IOP Publishing Ltd2021

Effects of central electron cyclotron power on plasma rotation and on triggerless onset of NTMs in the TCV tokamak

Olivier Sauter, Basil Duval, Duccio Testa, Holger Reimerdes, Alexander Karpushov, Doohyun Kim, Dávid Wágner, Lucia Isabel Federspiel, Jonathan Rossel

Experiments on the TCV tokamak show that high power central electron cyclotron heating (ECH) and current drive (ECCD) produce significant direct modification of the plasma rotation profile, as well as the effect on the equilibrium current density. These ef ...

IOP Publishing Ltd2015