Federico David Halpern

Cette personne a quitté l’EPFL

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Publications associées (30)

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Three-dimensional simulations of blob dynamics in a simple magnetized torus

Paolo Ricci, Joaquim Loizu Cisquella, Sébastien Jolliet, Federico David Halpern, Annamaria Mosetto

The propagation of blobs, structures of localized enhanced plasma pressure, is studied in global three-dimensional simulations of a simple magnetized torus. In particular, we carry out single-seeded blob simulations to explore the dependence of the blob ve ...

American Institute of Physics (AIP)2014

Turbulent regimes in the tokamak scrape-off layer

Paolo Ricci, Joaquim Loizu Cisquella, Sébastien Jolliet, Federico David Halpern, Annamaria Mosetto

The non-linear turbulent regimes in the tokamak scrape-off layer (SOL) are identified according to the linear instability responsible for the perpendicular transport. Four regions of the SOL operational parameters are determined where turbulence is driven ...

American Institute of Physics2013

Simulation of plasma turbulence in scrape-off layer conditions: the GBS code, simulation results and code validation

Ambrogio Fasoli, Ivo Furno, Paolo Ricci, Christian Gabriel Theiler, Joaquim Loizu Cisquella, Sébastien Jolliet, Federico David Halpern, Annamaria Mosetto

Based on the drift-reduced Braginskii equations, the Global Braginskii Solver, GBS, is able to model the scrape-off layer (SOL) plasma turbulence in terms of the interplay between the plasma outflow from the tokamak core, the turbulent transport, and the l ...

Iop Publishing Ltd2012

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

Paolo Ricci, Richard Pitts, Jan Horacek, 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

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

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

Verification methodology for plasma simulations and application to a scrape-off layer turbulence code

Paolo Ricci, Joaquim Loizu Cisquella, Sébastien Jolliet, Fabio Riva, Federico David Halpern, Annamaria Mosetto

Bridging the gap between plasma physics and other scientific domains, in particular, the computational fluid dynamics community, a general, rigorous, and simple-to-apply methodology is presented for both the verification of the correct implementation of th ...

American Institute of Physics2014

Comparison of 3D flux-driven scrape-off layer turbulence simulations with gas-puff imaging of Alcator C-Mod inner-wall limited discharges

Paolo Ricci, Mario Ludovico Podesta, Federico David Halpern

We carry out a quantitative comparison between gas-puff imaging (GPI) turbulence measurements in Alcator C-Mod inner-wall limited discharges (Zweben et al 2009 Phys. Plasmas 18 082505) and 3D flux-driven drift-reduced Braginskii turbulence simulations of s ...

Iop Publishing Ltd2015

Theory-based scaling of the SOL width in circular limited tokamak plasmas

Ivo Furno, Paolo Ricci, Benoît Labit, Joaquim Loizu Cisquella, Jan Horacek, Sébastien Jolliet, Federico David Halpern, Gilles Arnoux, Annamaria Mosetto

A theory-based scaling for the characteristic length of a circular, limited tokamak scrape-off layer (SOL) is obtained by considering the balance between parallel losses and non-linearly saturated resistive ballooning mode turbulence driving anomalous perp ...

IOP Publishing Ltd2013

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

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

2016