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Holger Reimerdes

Cette personne a quitté l’EPFL

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Publications associées (127)

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TCV heating and divertor upgrades

Ambrogio Fasoli, Basil Duval, Stefano Alberti, Jean-Marc Moret, Holger Reimerdes, Christian Gabriel Theiler, Alexander Karpushov, Matthieu Toussaint, Marcelo Baquero Ruiz, Dario Vaccaro

The operational range and the reactor relevance of the TCV experiments are being enhanced by two sets of major upgrades. The first includes the installation of neutral beam injection (NBI) and new electron cyclotron (EC) auxiliary heating sources, to reach ...

IOP Publishing Ltd2020

Exploring drift effects in TCV single-null plasmas with the UEDGE code

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

This paper explores the effects of particle drifts across the magnetic field in TCV single-null plasmas using the two-dimensional edge plasma transport code UEDGE. In particular, it aims to reproduce a double-peaked density target profile, a feature which ...

Institute of Physics2017

Overview of progress in European medium sized tokamaks towards an integrated plasma-edge/wall solution

Olivier Sauter, Basil Duval, Stefano Coda, Timothy Goodman, Yves Martin, Jean-Marc Moret, Duccio Testa, Patrick Blanchard, Holger Reimerdes, Benoît Labit, Christian Gabriel Theiler, Alessandro Pau, Federico Alberto Alfredo Felici, Cristian Sommariva, Laurie Porte, Alexander Karpushov, Marc Gruber, Antoine Pierre Emmanuel Alexis Merle, Joan Decker, Umar Sheikh, Cristian Galperti, Yanis Andrebe, Richard Pitts, Yann Camenen, Jan Horacek, Roland Behn, Javier García Hernández, Marco Wischmeier, Nicola Vianello, Federico Nespoli, Antonio José Pereira de Figueiredo, Emiliano Fable, Ben McMillan, Cedric Kar-Wai Tsui, Doohyun Kim, Kevin Henricus Annemarie Verhaegh, Wouter Vijvers, Anna Teplukhina, Zhouji Huang, Dávid Wágner, Claudio Marini, Thomas Binderup Jensen, Hoang Bao Le, Himank Anand, Attila Bencze

Integrating the plasma core performance with an edge and scrape-off layer (SOL) that leads to tolerable heat and particle loads on the wall is a major challenge. The new European medium size tokamak task force (EU-MST) coordinates research on ASDEX Upgrade ...

IOP Publishing Ltd2017

Understanding and suppressing the near Scrape-Oﬀ Layer heat flux feature in inboard-limited plasmas in TCV

Jan Horacek, Holger Reimerdes, Ivo Furno, Benoît Labit, Paolo Ricci, Christian Gabriel Theiler, Federico Nespoli, Cedric Kar-Wai Tsui, Roberto Maurizio

In inboard-limited plasmas, the Scrape-Oﬀ Layer (SOL) shows two regions: the near SOL, extending a few mm from the Last Closed Flux Surface (LCFS), characterized by a steep gradient of the parallel heat ﬂux radial proﬁle, and a far SOL, typically some cm w ...

International Atomic Energy Agency2017

Evidence for the Importance of Trapped Particle Resonances for Resistive Wall Mode Stability in High Beta Tokamak Plasmas

Holger Reimerdes

Active measurements of the plasma stability in tokamak plasmas reveal the importance of kinetic resonances for resistive wall mode stability. The rotation dependence of the magnetic plasma response to externally applied quasistatic n=1 magnetic fields clea ...

2011

New insights on divertor parallel flows,E x B drifts, and fluctuations from in situ, two-dimensional probe measurement in the Tokamak a Configuration Variable

Basil Duval, Holger Reimerdes, Christian Gabriel Theiler, Cedric Kar-Wai Tsui, Artur Perek, Hugo De Oliveira, Sophie Danielle Angelica Gorno

In situ, two-dimensional (2D) Langmuir probe measurements across a large part of the TCV outer divertor are reported in L-mode discharges with and without divertor baffles. This provides detailed insights into time averaged profiles, particle fluxes, and f ...

IOP Publishing Ltd2022

Impact of the plasma geometry on divertor power exhaust: experimental evidence from TCV and simulations with SolEdge2D and TOKAM3X

Holger Reimerdes, Christian Gabriel Theiler, Davide Galassi, Cedric Kar-Wai Tsui, Roberto Maurizio

A deep understanding of plasma transport at the edge of magnetically confined fusion plasmas is needed for the handling and control of heat loads on the machine first wall. Experimental observations collected on a number of tokamaks over the last three dec ...

2018

Numerical investigation of optimal divertor gas baffle closure on TCV

Stefano Coda, Benoît Labit, Holger Reimerdes, Christian Gabriel Theiler, Mirko Wensing, Davide Galassi

A first set of divertor gas baffles has recently been installed in the TCV tokamak. In order to explore the physics determining the benefits and limitations of divertor baffling and to guide the design of a possible second generation of baffles, the effect ...

2020

Power exhaust in the snowflake divertor for L- and H-mode TCV tokamak plasmas

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

The snowflake (SF) divertor is a plasma configuration that may enable tokamak operation at high performance and lower peak heat loads on the plasma-facing components than a standard single-null divertor. This paper reports on the results of experiments per ...

IOP Publishing Ltd2014

Access to an ELM-suppressed X-point radiator regime in TCV snowflake minus configurations

Yinghan Wang, Basil Duval, Holger Reimerdes, Christian Gabriel Theiler, Olivier Claude Martin Février, Guang-Yu Sun, Artur Perek, Curdin Tobias Wüthrich, Sophie Danielle Angelica Gorno, Luke Simons, Martim Zurita, Daniele Hamm, Ming Yin Kenneth Lee

TCV’s operating regime with an X-point radiator (XPR) has been broadened by changing the magnetic geometry. XPRs have properties that could make them an attractive power exhaust solution for fusion reactors. These include the conversion of a high fraction ...

Elsevier2024

Investigating the impact of the molecular charge-exchange rate on detached SOLPS-ITER simulations

Basil Duval, Holger Reimerdes, Christian Gabriel Theiler, Kevin Henricus Annemarie Verhaegh

Plasma-molecular interactions generate molecular ions which react with the plasma and contribute to detachment through molecular activated recombination (MAR), reducing the ion target flux, and molecular activated dissociation (MAD), both of which create e ...

IOP Publishing Ltd2023

Overview of the EUROfusion Tokamak Exploitation programme in support of ITER and DEMO

Pacôme Henryk Cécil Devleeshouver, Olivier Sauter, Stefano Coda, Basil Duval, Henri Weisen, Timothy Goodman, Duccio Testa, Jean-Marc Moret, Patrick Blanchard, Benoît Labit, Holger Reimerdes, Christian Gabriel Theiler, Federico Alberto Alfredo Felici, Alexander Karpushov, Antoine Pierre Emmanuel Alexis Merle, Umar Sheikh, Simon Van Mulders, Alessandro Pau, Cristian Galperti, Joan Decker, Marcelo Baquero Ruiz, Cedric Kar-Wai Tsui, Mengdi Kong, Matteo Vallar, Olivier Claude Martin Février, Davide Galassi, Guang-Yu Sun, Filippo Bagnato, Paulo Giovane Paschoali Pereira Puglia, Artur Perek, Claudia Colandrea, Sophie Danielle Angelica Gorno, Nicola Offeddu, Luke Simons, Aylwin Iantchenko, Lorenzo Martinelli, Oleg Krutkin, Dmytry Mykytchuk, Jesús Poley Sanjuán, Carl Mathias Paul Hoppe, Benjamin Alexandre Vincent, Umesh Kumar, Garance Hélène Salomé Durr-Legoupil-Nicoud, Massimo Carpita, Jean Arthur Cazabonne, Davide Mancini, Cassandre Ekta Contré, Stefano Marchioni, Samuele Mazzi, Gino Marceca, Renat Karimov, Elena Tonello, Yoeri Renier Johannes Poels, Michele Marin, Martim Zurita, Alessandro Balestri, Anton Jansen Van Vuuren, Francesco Pastore, Mackenzie Peter-Fulford Van Rossem, Emanuel Paul Huett, Nam Axel David Vu, Hari Raj, Antonia Frank, Aleksandr Listopad

Within the 9th European Framework programme, since 2021 EUROfusion is operating five tokamaks under the auspices of a single Task Force called ‘Tokamak Exploitation’. The goal is to benefit from the complementary capabilities of each machine in a coordinat ...

IOP Publishing Ltd2024

Thermal, electromagnetic and structural analysis of gas baffles for the TCV divertor upgrade

Dario Vaccaro, Basil Duval, Jean-Marc Moret, Holger Reimerdes, Christian Gabriel Theiler, Matthieu Toussaint

As part of an ongoing divertor upgrade of the TCV tokamak it is planned to add gas baffles to form a divertor chamber of variable closure. The baffles promise to increase the compression of neutral particles in the divertor and, thereby, extend the researc ...

Elsevier2019

Results from recent detachment experiments in alternative divertor configurations on TCV

Holger Reimerdes, Benoît Labit, Christian Gabriel Theiler, Umar Sheikh, Nicola Vianello, Federico Nespoli, Cedric Kar-Wai Tsui, Kevin Henricus Annemarie Verhaegh, Wouter Vijvers, Roberto Maurizio

Divertor detachment is explored on the TCV tokamak in alternative magnetic geometries. Starting from typical TCV single-null shapes, the poloidal flux expansion at the outer strikepoint is varied by a factor of 10 to investigate the X-divertor characterist ...

IOP Publishing Ltd2017

H-mode scrape-off layer power width in the TCV tokamak

Basil Duval, Benoît Labit, Holger Reimerdes, Christian Gabriel Theiler, Umar Sheikh, Roberto Maurizio

Obtaining acceptable conditions at the divertor targets of a next-step fusion experiment based on the tokamak concept is expected to be particularly challenging because of the small predicted value of the plasma power exhaust channel width. An increased co ...

IOP Publishing Ltd2021

The operational space for divertor power exhaust in DEMO with a super-X divertor

Holger Reimerdes, Marco Wischmeier, Mirko Wensing

SOLPS-ITER simulations of the European DEMO reactor with a Super-X divertor, which has larger major radius at the outer target and increased connection length, show an increased operational space for divertor power exhaust compared to the conventional sing ...

IOP Publishing Ltd2021

Improved heat and particle flux mitigation in high core confinement, baffled, alternative divertor configurations in the TCV tokamak

Basil Duval, Patrick Blanchard, Benoît Labit, Holger Reimerdes, Christian Gabriel Theiler, Umar Sheikh, Artur Perek, Matteo Vallar, Hugo De Oliveira, Filippo Bagnato, Sophie Danielle Angelica Gorno, Claudia Colandrea, Harshita Raj

Nitrogen seeded detachment has been achieved in the tokamak a configuration variable (TCV) in alternative divertor configurations (ADCs), namely X-divertor and X-point target, with and without baffles in H-mode plasmas with high core confinement. Both ADCs ...

IOP Publishing Ltd2022

Numerical study of divertor detachment in TCV H-mode scenarios

Holger Reimerdes, Christian Gabriel Theiler, Davide Galassi, Filippo Bagnato, Sophie Danielle Angelica Gorno

The effect of divertor closure and nitrogen seeding on the detachment process has been studied by performing 2D numerical simulations of tokamak a configuration variable (TCV) H-mode divertor scenarios with the SOLEDGE3X-EIRENE edge plasma transport code. ...

Iop Publishing Ltd2023

The DTT device: Power and particle exhaust

Holger Reimerdes

The possible scenarios at full power of the DTT (Divertor Test Tokamak) device with the standard single null (SN) and X divertor (XD) configurations have been analysed for the aspect of safely handling the power to be exhausted on the divertor targets. In ...

Elsevier Science Sa2017

SOLPS-ITER simulations of the TCV divertor upgrade

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

The effect of the upcoming TCV divertor upgrade on the distribution of neutrals and the onset of detachment is studied using 2D transport code simulations. The divertor upgrade is centered around the installation of a gas baffle to form a divertor chamber ...

2019