Publications de Alessandro Bortolon

Overview of physics studies on ASDEX Upgrade

Basil Duval, Timothy Goodman, Richard Pitts, Olivier Sauter, Stefano Coda, Alberto Bottino, Marco Wischmeier, Andrea Scarabosio, Hartmut Zohm, Laurie Porte, Yann Camenen, Thomas Binderup Jensen, Benoît Labit, Emiliano Fable, Alessandro Bortolon, Federico Alberto Alfredo Felici, Fang Liu, Dávid Wágner, Antoine Pierre Emmanuel Alexis Merle, Emanuele Poli, Nicola Vianello, Giovanni Tardini, Cristian Sommariva, Alessandro Pau, Otto Asunta, Haomin Sun, Xiao Wang, Gergely Papp, Bernhard Sieglin

The ASDEX Upgrade (AUG) programme, jointly run with the EUROfusion MST1 task force, continues to significantly enhance the physics base of ITER and DEMO. Here, the full tungsten wall is a key asset for extrapolating to future devices. The high overall heat ...

IOP Publishing Ltd2019

DIII-D research towards establishing the scientific basis for future fusion reactors

Wilfred Anthony Cooper, Richard Pitts, Olivier Sauter, Stefan Müller, Mario Ludovico Podesta, Francesca Maria Poli, Dongbin Zhao, Gang Yu, Huan Du, Alessandro Bortolon, Alessandro Marinoni, Jeffrey Huang, Sun Hee Kim, Jérôme Guterl, Zhixian Yan, Fang Liu, Terunobu Akiyama, Xin Yang, Wei Wu, Lorenzo Anton-Louis Talà, Federico David Halpern, Gabriele Merlo, Yu Fu, Shouguo Wang, Sung Chul Park, Xi Chen, Tzu-Hsien Shen, Bingying Zhao, Kyungjin Kim, Ji Hyun Kim, Yi Wang, Hui Wang, Zheng Wang

DIII-D research is addressing critical challenges in preparation for ITER and the next generation of fusion devices through focusing on plasma physics fundamentals that underpin key fusion goals, understanding the interaction of disparate core and boundary ...

IOP Publishing Ltd2019

Experimental observations and modelling of intrinsic rotation reversals in tokamaks

Basil Duval, Yann Camenen, Emiliano Fable, Alessandro Bortolon

The progress made in understanding spontaneous toroidal rotation reversals in tokamaks is reviewed and current ideas to solve this ten-year-old puzzle are explored. The paper includes a summarial synthesis of the experimental observations in AUG, C-Mod, KS ...

Iop Publishing Ltd2017

Development of real-time plasma analysis and control algorithms for the TCV tokamak using SIMULINK

Basil Duval, Timothy Goodman, Jean-Marc Moret, Olivier Sauter, Stefano Coda, Lucia Isabel Federspiel, Alessandro Bortolon, Andreas Pitzschke, James Paley, Francesco Piras, Federico Alberto Alfredo Felici, Wouter Vijvers, Hoang Bao Le

One of the key features of the new digital plasma control system installed on the TCV tokamak is the possibility to rapidly design, test and deploy real-time algorithms. With this flexibility the new control system has been used for a large number of new e ...

Elsevier2013

Indirect measurement of poloidal rotation using inboard–outboard asymmetry of toroidal rotation and comparison with neoclassical predictions

Basil Duval, Olivier Sauter, Alexander Karpushov, Yanis Andrebe, Yann Camenen, Lucia Isabel Federspiel, Alessandro Bortolon

An alternative experimental spectroscopic measurement of poloidal plasma rotation in toroidally confined plasmas is proven effective in the TCV tokamak. Charge exchange recombination measurements of the toroidal rotation profile over the full mid-plane pla ...

Int Atomic Energy Agency2012

Observations of core toroidal rotation reversals in Alcator C-Mod ohmic L-mode plasmas

Basil Duval, Alessandro Bortolon

Direction reversals of intrinsic toroidal rotation have been observed in Alcator C-Mod ohmic L-mode plasmas following modest electron density or toroidal magnetic field ramps. The reversal process occurs in the plasma interior, inside of the q = 3/2 surfac ...

IOP Publishing Ltd2011

Overview of toroidal momentum transport

Basil Duval, Yann Camenen, Alessandro Bortolon, Giovanni Tardini

Toroidal momentum transport mechanisms are reviewed and put in a broader perspective. The generation of a finite momentum flux is closely related to the breaking of symmetry (parity) along the field. The symmetry argument allows for the systematic identifi ...

IOP Publishing Ltd2011

Experimental demonstration of an up-down asymmetry effect on intrinsic rotation in the TCV tokamak

Basil Duval, Olivier Sauter, Alexander Karpushov, Yann Camenen, Lucia Isabel Federspiel, Alessandro Bortolon, Francesco Piras

A new mechanism has recently been proposed that generates a radial flux of parallel momentum in toroidal plasmas. Namely, by considering up-down asymmetric flux surfaces, the symmetry following the magnetic field can be broken and an additional contributio ...

Institute of Physics2010

Experimental Evidence of Momentum Transport Induced by an Up-Down Asymmetric Magnetic Equilibrium in Toroidal Plasmas

Basil Duval, Olivier Sauter, Alexander Karpushov, Yann Camenen, Lucia Isabel Federspiel, Alessandro Bortolon, Francesco Piras

The first experimental evidence of parallel momentum transport generated by the up-down asymmetry of a toroidal plasma is reported. The experiments, conducted in the Tokamak a` Configuration Variable, were motivated by the recent theoretical discovery of i ...

2010

Plasma rotation and momentum transport studies in the TCV tokamak based on charge exchange spectroscopy measurements

Alessandro Bortolon

Thermonuclear controlled fusion research is a highly active branch of plasma physics. The main goal is the production of energy from the fusion reaction of hydrogen isotope nuclei, the same reaction that powers stars. The most promising present approach ar ...

EPFL2009

The diagnostic neutral beam injector with arc-discharge plasma source on the TCV Tokamak

Basil Duval, Alexander Karpushov, Yanis Andrebe, Alessandro Bortolon

The diagnostic neutral beam injector (DNBI) together with a charge exchange recombination spectroscopy (CXRS) system has been used on the TCV Tokamak as a diagnostic tool for local measurements of plasma ion temperature, velocity and carbon impurity densit ...

Elsevier B.V.2009

Spontaneous L-mode plasma rotation scaling in the TCV tokamak

Basil Duval, Richard Pitts, Antoine Pochelon, Olivier Sauter, Andrea Scarabosio, Alexander Karpushov, Alessandro Bortolon

2008

Inter-machine comparison of intrinsic toroidal rotation in tokamaks

Basil Duval, Antoine Pochelon, Andrea Scarabosio, Alessandro Bortolon

Parametric scalings of the intrinsic (spontaneous, with no external momentum input) toroidal rotation observed on a large number of tokamaks have been combined with an eye towards revealing the underlying mechanism(s) and extrapolation to future devices. T ...

IOP Publishing Ltd2007

Bulk Plasma Rotation in the TCV Tokamak in the Absence of External Momentum Input (Invited paper)

Basil Duval, Richard Pitts, Antoine Pochelon, Andrea Scarabosio, Alexander Karpushov, Alessandro Bortolon

2007

Plasma dynamics with second and third-harmonic ECRH and access to quasi-stationary ELM-free H-mode on TCV

Gilles Arnoux, Patrick Blanchard, Stefano Alberti, Ambrogio Fasoli, Timothy Goodman, Yves Martin, Henri Weisen, Stefano Coda, Andrea Scarabosio, Laurie Porte, Alessandro Bortolon, Mikhail Maslov

Intense electron cyclotron resonance heating (ECRH) and electron cyclotron current drive (ECCD) are employed on the Tokamak a Configuration Variable (TCV) both in second- and third-harmonic X-mode (X2 and X3). The plasma behaviour under such conditions is ...

IOP Publishing Ltd2007

Physics insight from plasma shaping experiments in the TCV tokamak

Stephan Brunner, Stefano Alberti, Roland Behn, Basil Duval, Ambrogio Fasoli, Timothy Goodman, Antoine Pochelon, Ivo Furno, Holger Reimerdes, Stefano Coda, Alberto Bottino, Andrea Scarabosio, Yann Camenen, Jonathan Graves, Alessandro Bortolon, Alessandro Marinoni

2007

Stationary ELM-free H-mode on TCV

Stefano Alberti, Yves Martin, Olivier Sauter, Alexander Karpushov, Laurie Porte, Alessandro Bortolon

2007

Vertical Launch Third Harmonic Electron Cyclotron Resonance Heating of H-mode on TCV and Access to Quasi-Stationary ELM-free H-mode

Gilles Arnoux, Stefano Alberti, Yves Martin, Olivier Sauter, Henri Weisen, Andrea Scarabosio, Laurie Porte, Alessandro Bortolon, Mikhail Maslov

2007

Bulk Plasma Rotation in the TCV Tokamak in the Absence of External Momentum Input

Basil Duval, Richard Pitts, Antoine Pochelon, Andrea Scarabosio, Alexander Karpushov, Alessandro Bortolon

2007

Impact of plasma triangularity and collisionality on electron heat transport in TCV L-mode plasmas

Roland Behn, Antoine Pochelon, Olivier Sauter, Stefano Coda, Alberto Bottino, Alexander Karpushov, Yann Camenen, Alessandro Bortolon

The impact of plasma shaping on electron heat transport is investigated in TCV L-mode plasmas. The study is motivated by the observation of an increase in the energy confinement time with decreasing plasma triangularity which may not be explained by a chan ...

IOP Publishing Ltd2007