Publications by Federico David Halpern

Progressive steps towards global validated simulation of edge plasma turbulence

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

Simulations of edge turbulence are particularly challenging due to the presence of large amplitude fluctuations and to the coupling of equilibrium and fluctuating scales. While validating edge simulations is necessary to assess the accuracy of our understa ...

2012

Global two-fluid simulations of tokamak Scape-Off-Layer turbulence

Paolo Ricci, Sébastien Jolliet, Federico David Halpern, Annamaria Mosetto

We present non-linear self-consistent 3D global fluid simulations of the SOL plasma dynamics using the Global Braginskii Solver (GBS) code. The code solves the drift-reduced Braginkii equations in a collisional plasma, with cold ions. The GBS code, origina ...

2012

Tokamak SOL fluid simulations with self-consistent boundary conditions at the magnetic presheath edge

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

Fluid codes simulating the dynamics of magnetized plasmas with field lines terminating on the device vessel require boundary conditions that are consistent with the plasma-wall transition region. When the magnetic field strikes the wall at an oblique angle ...

2012

Boundary conditions for plasma fluid models at the magnetic presheath entrance

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

The proper boundary conditions at the magnetic presheath entrance for plasma fluid turbulence models based on the drift approximation are derived, focusing on a weakly collisional plasma sheath with Ti≪Te and a magnetic field oblique to a totally absorbing ...

American Institute of Physics2012

Low-frequency linear-mode regimes in the tokamak scrape-off layer

Paolo Ricci, Sébastien Jolliet, Federico David Halpern, Annamaria Mosetto

Motivated by the wide range of physical parameters characterizing the scrape-off layer (SOL) of existing tokamaks, the regimes of low-frequency linear instabilities in the SOL are identified by numerical and analytical calculations based on the linear, dri ...

American Institute of Physics2012

Bifurcated Helical Core Equilibrium States in Tokamaks

Olivier Sauter, Basil Duval, Stefano Coda, Jonathan Graves, Wilfred Anthony Cooper, Holger Reimerdes, Benoît Labit, Antoine Pochelon, David Pfefferlé, Federico David Halpern, Daniele Brunetti, Jonathan Rossel, Mattia Albergante

Tokamaks with weak to moderate reversed central shear in which the minimum rotational transform

q_{min}

is in the neighbourhood of unity can trigger bifurcated MagnetoHydrodynamic (MHD) equilibrium states, one of which is similar to a saturated ideal ...

2012

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

MHD properties in the core of ITER-like hybrid scenarios

Jonathan Graves, Wilfred Anthony Cooper, Federico David Halpern, Daniele Brunetti

MHD stability is studied in the frame of ITER like hybrid scenarios, characterized by weak reversed shear, with particular attention on ideal internal kink modes and infernal mode stability. Numerical simulations for ITER like equilibria, with hollow q pro ...

Iop Publishing Ltd2012

Simulation of tokamak SOL turbulence

Paolo Ricci, Federico David Halpern, Annamaria Mosetto

One of the most important open issue for the realization of a fusion reactor is the understanding of the turbulence that develops at the periphery of the device, in the region called the edge. Turbulence is the major cause of particles and energy losses an ...

2011

Global two-fluid simulations of tokamak SOL turbulence

Paolo Ricci, Federico David Halpern, Annamaria Mosetto

We present non-linear self-consistent global simulations of the SOL plasma dynamics using the Global Braginskii Solver (GBS) code. The code solves on the drift-reduced Braginkii equations, with cold ions. Studied originally for the simulation of the Simple ...

2011

Federico David Halpern

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Progressive steps towards global validated simulation of edge plasma turbulence

Global two-fluid simulations of tokamak Scape-Off-Layer turbulence

Tokamak SOL fluid simulations with self-consistent boundary conditions at the magnetic presheath edge

Boundary conditions for plasma fluid models at the magnetic presheath entrance

Low-frequency linear-mode regimes in the tokamak scrape-off layer

Bifurcated Helical Core Equilibrium States in Tokamaks

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

MHD properties in the core of ITER-like hybrid scenarios

Simulation of tokamak SOL turbulence

Global two-fluid simulations of tokamak SOL turbulence

Progressive steps towards global validated simulation of edge plasma turbulence

Boundary conditions for plasma fluid models at the magnetic presheath entrance

Global two-fluid simulations of tokamak Scape-Off-Layer turbulence

Tokamak SOL fluid simulations with self-consistent boundary conditions at the magnetic presheath edge

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

Low-frequency linear-mode regimes in the tokamak scrape-off layer

Simulation of tokamak SOL turbulence

Global two-fluid simulations of tokamak SOL turbulence

Bifurcated Helical Core Equilibrium States in Tokamaks

MHD properties in the core of ITER-like hybrid scenarios