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Paolo Ricci

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Publications associées (139)

Impact of neutral density fluctuations on gas puff imaging diagnostics

Paolo Ricci, Christoph Wersal

A three-dimensional turbulence simulation of the SOL and edge regions of a toroidally limited tokamak is carried out. The simulation couples self-consistently the drift-reduced two-fluid Braginskii equations to a kinetic equation for neutral atoms. A diagn ...

International Atomic Energy Agency2017

Blob properties in full-turbulence simulations of the TCV scrape-off layer

Ivo Furno, Benoît Labit, Paolo Ricci, Fabio Riva, Federico David Halpern, Fabio Avino, Federico Nespoli

To investigate blob properties in the tokamak scrape-off layer (SOL), we perform dedicated numerical nonlinear simulations of plasma turbulence in the SOL of a TCV discharge using the Global Braginskii Solver code. A blob detection technique is used for th ...

2017

A drift-kinetic analytical model for scrape-off layer plasma dynamics at arbitrary collisionality

Paolo Ricci, Rogério Manuel Cabete De Jesus Jorge

A drift-kinetic model to describe the plasma dynamics in the scrape-off layer region of tokamak devices at arbitrary collisionality is derived. Our formulation is based on a gyroaveraged Lagrangian description of the charged particle motion, and the corres ...

Cambridge University Press2017

Scrape-off-layer current loops and floating potential in limited tokamak plasmas

Joaquim Loizu Cisquella, Paolo Ricci, Federico David Halpern, Paola Paruta

We investigate the question of how plasma currents circulate and close in the scrape-off-layer (SOL) of convection-limited tokamak plasmas. A simplified two-fluid model describes how currents must evacuate charge at the sheaths due to cross-field currents ...

Cambridge University Press2017

Non-linear simulations of the TCV Scrape-Off Layer

Ivo Furno, Benoît Labit, Joaquim Loizu Cisquella, Paolo Ricci, Fabio Riva, Federico David Halpern, Federico Nespoli

To investigate the mechanisms leading to the heat deposition onto the first wall in the Scrape-Off Layer (SOL), we perform dedicated numerical non-linear simulations of the SOL plasma dynamics of a TCV discharge using the GBS code. The simulated parallel h ...

Elsevier Science Bv2017

A comparison between a refined two-point model for the limited tokamak SOL and self-consistent plasma turbulence simulations

Joaquim Loizu Cisquella, Paolo Ricci, Christoph Wersal

A refined two-point model is derived from the drift-reduced Braginskii equations for the limited tokamak scrape-off layer (SOL) by balancing the parallel and perpendicular transport of plasma and heat and taking into account the plasma–neutral interaction. ...

Institute of Physics2017

Velocity shear, turbulent saturation, and steep plasma gradients in the scrape-off layer of inner-wall limited tokamaks

Paolo Ricci, Federico David Halpern

The narrow power decay-length (lambda(q)), recently found in the scrape-off layer (SOL) of inner-wall limited (IWL) discharges in tokamaks, is studied using 3D, flux-driven, global two-fluid turbulence simulations. The formation of the steep plasma profile ...

IOP Publishing Ltd2017

Summary of 21st joint EU-US transport task force workshop (Leysin, September 5-8, 2016)

Yann Camenen, Paolo Ricci

This conference report summarizes the contributions to, and discussions at, the 21st Joint EU-US Transport Task Force workshop, held in Leysin, Switzerland, during 5-8 September 2016. The workshop was organized under 8 topics: progress towards full-F kinet ...

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, , , , , , , , , , , , , , ,

Overview of recent physics results from MAST

Wilfred Anthony Cooper, Ricardo Pérez Suárez, Marco Wischmeier, Jan Horacek, Ben McMillan, Paolo Ricci, Fabio Riva

IOP Publishing Ltd2017

Uncertainty propagation by using spectral methods: A practical application to a two-dimensional turbulence fluid model

Paolo Ricci, Fabio Riva

To reduce the computational cost of the uncertainty propagation analysis, which is used to study the impact of input parameter variations on the results of a simulation, a general and simple to apply methodology based on decomposing the solution to the mod ...

American Institute of Physics2017

Plasma blob studies using a fluorescent probe

Paul Bowen, Ambrogio Fasoli, Ivo Furno, Carlos Morais, Paolo Ricci, Oulfa Chellaï, Weitian Zhao, Marcelo Baquero Ruiz, Fabian Manke

2017

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

Multi-code analysis of scrape-off layer filament dynamics in MAST

Paolo Ricci, Fabio Riva

Four numerical codes are employed to investigate the dynamics of scrape-off layer filaments in tokamak relevant conditions. Experimental measurements were taken in the MAST device using visual camera imaging, which allows the evaluation of the perpendicula ...

Institute of 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

The GBS code for tokamak scrape-off layer simulations

Trach-Minh Tran, Sébastien Jolliet, Joaquim Loizu Cisquella, Paolo Ricci, Fabio Riva, Annamaria Mosetto, Federico David Halpern, Christoph Wersal

We describe a new version of GBS, a 3D global, flux-driven plasma turbulence code to simulate the turbulent dynamics in the tokamak scrape-off layer (SOL), superseding the code presented by Ricci et al. (2012) [14]. The present work is driven by the object ...

Elsevier2016

Non-diffusive transport of suprathermal ions by intermittent turbulent structures

Ambrogio Fasoli, Ivo Furno, Alexandre Dominique Bovet, Paolo Ricci, Kyle Gustafson

We report on recent experimental, numerical and theoretical investigations of suprathermal ion transport and turbulent plasma dynamics in TORPEX. TORPEX is a toroidal device in which field-aligned blobs are intermittently generated and propagate across a c ...

2016

A theoretical interpretation of the main scrape-off layer heat-flux width scaling for tokamak inner-wall limited plasmas

Richard Pitts, Jan Horacek, Paolo Ricci, Federico David Halpern

The International Tokamak Physics Activity Topical Group on scrape-off layer and divertor physics has amassed a database comprising hundreds of reciprocating Langmuir probe measurements of the main scrape-off layer heat-flux width lambda(q) in inner-wall l ...

Institute of Physics2016

Plasma turbulence in the scrape-off layer of the ISTTOK tokamak

Paolo Ricci, Federico David Halpern, Rogério Manuel Cabete De Jesus Jorge

The properties of plasma turbulence in a poloidally limited scrape-off layer (SOL) are addressed, with focus on ISTTOK, a large aspect ratio tokamak with a circular cross section. Theoretical investigations based on the drift-reduced Braginskii equations a ...

American Institute of Physics (AIP)2016