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Christian Gabriel Theiler

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Related publications (153)

Experimental Studies of the Snowflake Divertor in TCV

Basil Duval, Holger Reimerdes, Benoît Labit, Christian Gabriel Theiler, Wouter Vijvers, Federico Nespoli, Cedric Kar-Wai Tsui, Umar Sheikh, Kevin Henricus Annemarie Verhaegh

To address the risk that, in a fusion reactor, the conventional single-null divertor (SND) configuration may not be able to handle the power exhaust, alternative divertor configurations, such as the Snowflake divertor (SFD), are investigated in TCV. The ex ...

Elsevier Science Bv2017

Modification of SOL profiles and fluctuations with line-average density and divertor flux expansion in TCV

Holger Reimerdes, Benoît Labit, Christian Gabriel Theiler, Wouter Vijvers, Cedric Kar-Wai Tsui, Kevin Henricus Annemarie Verhaegh, Nicola Vianello

A set of Ohmic density ramp experiments addressing the role of parallel connection length in modifying scrape off layer (SOL) properties has been performed on the TCV tokamak. The parallel connection length has been modified by varying the poloidal flux ex ...

IOP Publishing Ltd2017

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

Patrick Blanchard, Stefano Alberti, Basil Duval, Ambrogio Fasoli, Timothy Goodman, Xavier Llobet, Yves Martin, Jean-Marc Moret, Olivier Sauter, Minh Quang Tran, Henri Weisen, Ivo Furno, Holger Reimerdes, Jean-Philippe Hogge, Stefano Coda, Christian Schlatter, Marco Wischmeier, Jan Horacek, Alexander Karpushov, Laurie Porte, Yanis Andrebe, Yann Camenen, Jonathan Graves, Duccio Testa, Benoît Labit, Rémy Jacquier, Paolo Ricci, Christian Gabriel Theiler, Federico Alberto Alfredo Felici, Fabio Riva, Wouter Vijvers, Josef Kamleitner, Hoang Bao Le, Zhouji Huang, Himank Anand, Falk Hans Braunmüller, Joyeeta Sinha, Claudio Marini, Antoine Pierre Emmanuel Alexis Merle, Federico Nespoli, Oulfa Chellaï, , , , , , , , , , , , , , ,

Physics and performance of the I-mode regime over an expanded operating space on Alcator C-Mod

Christian Gabriel Theiler, Yu Lin

New results on the I-mode regime of operation on the Alcator C-Mod tokamak are reported. This ELM-free regime features high energy confinement and a steep temperature pedestal, while particle confinement remains at L-mode levels, giving stationary density ...

IOP Publishing Ltd2017

TCV experiments towards the development of a plasma exhaust solution

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

IOP Publishing Ltd2017

Spectroscopic investigations of divertor detachment in TCV

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

The aim of this work is to provide an understanding of detachment at TCV with emphasis on analysis of the Balmer line emission. A new Divertor Spectroscopy System has been developed for this purpose. Further development of Balmer line analysis techniques h ...

Elsevier2017

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

Ivo Furno, Holger Reimerdes, Jan Horacek, 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

Poloidal asymmetry in the narrow heat flux feature in the TCV scrape-off layer

Basil Duval, Ivo Furno, Holger Reimerdes, Stefano Coda, Jan Horacek, Benoît Labit, Joaquim Loizu Cisquella, Paolo Ricci, Christian Gabriel Theiler, Federico David Halpern, Federico Nespoli, Cedric Kar-Wai Tsui

Heat flux profiles inferred from a reciprocating probe at the outer midplane of the TCV tokamak during inner wall limited discharges feature radial fall-off lengths that shorten near the last closed flux surface (LCFS) consistent with the so-called narrow ...

American Institute of Physics (AIP)2017

Quantitative comparison of electron temperature fluctuations to nonlinear gyrokinetic simulations in C-Mod Ohmic L-mode discharges

Christian Gabriel Theiler

Long wavelength turbulent electron temperature fluctuations (k(y)rho(s)< 0.3) are measured in the outer core region (r/a> 0.8) of Ohmic L-mode plasmas at Alcator C-Mod [E. S. Marmar et al., Nucl. Fusion 49, 104014 (2009)] with a correlation electron cyclot ...

Amer Inst Physics2016

X-Point Effect on Plasma Blob Dynamics

Ambrogio Fasoli, Ivo Furno, Paolo Ricci, Christian Gabriel Theiler, Fabio Avino

Plasma blob dynamics on the high-field side in the proximity of a magnetic field null (X point) is investigated in TORPEX. A significant acceleration of the blobs towards the X point is observed. Close to the X point the blobs break apart. The E x B drifts ...

American Physical Society2016

Multi-device studies of pedestal physics and confinement in the I-mode regime

Alessandro Marinoni, Christian Gabriel Theiler

This paper describes joint ITPA studies of the I-mode regime, which features an edge thermal barrier together with L-mode-like particle and impurity transport and no edge localized modes (ELMs). The regime has been demonstrated on the Alcator C-Mod, ASDEX ...

IOP Publishing Ltd2016

The physics of the heat flux narrow decay length in the TCV scrape-off layer: experiments and simulations

Richard Pitts, Ivo Furno, Jan Horacek, Benoît Labit, Paolo Ricci, Christian Gabriel Theiler, Federico David Halpern, Federico Nespoli, Cedric Kar-Wai Tsui

2016

Blob dynamics in the TORPEX experiment: a multi-code validation

Ivo Furno, Paolo Ricci, Christian Gabriel Theiler, Fabio Riva, Eric Serre

Three-dimensional and two-dimensional seeded blob simulations are performed with five different fluid models, all based on the drift-reduced Braginskii equations, and the numerical results are compared among themselves and validated against experimental me ...

Institute of Physics2016

ADX: a high field, high power density, advanced divertor and RF tokamak

Francesca Maria Poli, Christian Gabriel Theiler, Yu Lin, John Wilson

The MIT Plasma Science and Fusion Center and collaborators are proposing a high-performance Advanced Divertor and RF tokamak eXperiment (ADX)-a tokamak specifically designed to address critical gaps in the world fusion research programme on the pathway to ...

IOP Publishing Ltd2015

Poloidal asymmetries in edge transport barriers

Christian Gabriel Theiler

Measurements of impurities in Alcator C-Mod indicate that in the pedestal region, significant poloidal asymmetries can exist in the impurity density, ion temperature, and main ion density. In light of the observation that ion temperature and electrostatic ...

Amer Inst Physics2015

Improved confinement in high-density H-modes via modification of the plasma boundary with lower hybrid waves

Peng Xu, Christian Gabriel Theiler, Yu Lin

Injecting Lower Hybrid Range of Frequency (LHRF) waves into Alcator C-Mod's high-density H-mode plasmas has led to enhanced global energy confinement by increasing pedestal temperature and pressure gradients, decreasing the separatrix density, modifying th ...

Amer Inst Physics2015

Approaching the investigation of plasma turbulence through a rigorous verification and validation procedure: A practical examplea)

Ambrogio Fasoli, Ivo Furno, Joaquim Loizu Cisquella, Paolo Ricci, Christian Gabriel Theiler, Fabio Riva, Federico David Halpern

In the present work, a Verification and Validation procedure is presented and applied showing, through a practical example, how it can contribute to advancing our physics understanding of plasma turbulence. Bridging the gap between plasma physics and other ...

American Institute of Physics (AIP)2015

Plasma turbulence, suprathermal ion dynamics and code validation on the basic plasma physics device TORPEX

Ambrogio Fasoli, Ivo Furno, Mario Ludovico Podesta, Francesca Maria Poli, Benoît Labit, Alexandre Dominique Bovet, Joaquim Loizu Cisquella, Gennady Plyushchev, Davoud Iraji, Paolo Ricci, Christian Gabriel Theiler, Kyle Gustafson, Fabio Avino

The TORPEX basic plasma physics device at the Center for Plasma Physics Research (CRPP) in Lausanne, Switzerland is described. In TORPEX, simple magnetized toroidal configurations, a paradigm for the tokamak scrape-off layer (SOL), as well as more complex ...

Cambridge University Press2015

Electromagnetic turbulent structures: A ubiquitous feature of the edge region of toroidal plasma configurations

Ambrogio Fasoli, Ivo Furno, Christian Gabriel Theiler, Fabio Avino, Nicola Vianello

Electromagnetic features of turbulent filaments, emerging from a turbulent plasma background, have been studied in four different magnetic configurations: the stellarator TJ-II, the Reversed Field Pinch RFX-mod, a device that can be operated also as a ohmi ...

Amer Inst Physics2015

Nonlinear gyrokinetic simulations of the I-mode high confinement regime and comparisons with experiment

Christian Gabriel Theiler

For the first time, nonlinear gyrokinetic simulations of I-mode plasmas are performed and compared with experiment. I-mode is a high confinement regime, featuring energy confinement similar to H-mode, but without enhanced particle and impurity particle con ...

Amer Inst Physics2015

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Pedro Andres Molina Cabrera

Umar Sheikh

Cristian Galperti

Kevin Henricus Annemarie Verhaegh

IOP Publishing Ltd2017