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Stefano Alberti

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Publications associées (139)

Stacked rings for terahertz wave-guiding

Stefano Alberti, Jean-Philippe Ansermet, Jean-Philippe Hogge, Emile Jacques de Rijk, Alessandro Macor

We demonstrate the construction of corrugated waveguides using stacked rings to propagate terahertz frequencies. The waveguide allows propagation of the same fundamental mode as an optical-fiber, namely, the H E11 mode. This simple concept opens the way fo ...

American Institute of Physics2011

The Thirteenth Special Issue on High-Power Microwave Generation

Stefano Alberti, Minh Quang Tran

2010

Infrared Measurements of the RF Output of 170-GHz/2-MW Coaxial Cavity Gyrotron and Its Phase Retrieval Analysis

Stefano Alberti, Timothy Goodman, Jean-Philippe Hogge

We report the experimental results of the infrared measurements of output RF beam of the European 2-MW 170-GHz coaxial cavity gyrotron for ITER. The output beam profile is measured by the infrared thermographic technique using an infrared camera and a targ ...

2009

First experimental results from the European Union 2 MW coaxial cavity ITER gyrotron prototype

Stefano Alberti, Damien Fasel, Timothy Goodman, Pierre Lavanchy, Blaise Marlétaz, Philippe Marmillod, Albert Perez, Minh Quang Tran, Jean-Philippe Hogge, Ugo Siravo, Laurie Porte, Emmanuel Droz, Ioannis Pagonakis

The European Union is working toward providing 2-MW, coaxial-cavity, continuous-wave (cw) 170-GHz gyrotrons for ITER. Their design is based on results,from an experimental preprototype tube having a pulse length of several milliseconds, in operation at For ...

American Nuclear Society2009

Modulation of electron transport during Swing ECCD discharges in TCV

Stefano Alberti, Timothy Goodman, Olivier Sauter, Costanza Zucca

Generation of a swing electron cyclotron current drive (swing ECCD), i.e. driving alternated, symmetric, positive or negative local ECCD, during a single discharge and at constant total input EC power, was performed at the Tokamak a Configuration Variable ...

IOP2009

First experimental results from the EU 2 MW coaxial cavity ITER gyrotron prototype

Stefano Alberti, Damien Fasel, Timothy Goodman, Minh Quang Tran, Jean-Philippe Hogge, Ugo Siravo, Laurie Porte, Emmanuel Droz

The EU is working towards providing 2 MW, coaxial-cavity, CW, 170 GHz gyrotrons for ITER. Their design is based on results from an experimental pre-prototype tube in operation at FZK for several years, having a pulse length of several milliseconds. The fir ...

World Scientific Publ Co Inc, 687 Hartwell St, Teaneck, Nj 07666 Usa2009

Theoretical Investigation of Iterative Phase Retrieval Algorithm for Quasi-Optical Millimeter-Wave RF Beams

Stefano Alberti, Jean-Philippe Hogge

In this paper, we present a detailed analysis of the iterative phase retrieval approach (TPRA) for determining the phase profile of the output microwave beam of a gyrotron from known intensity patterns emphasizing the field propagation techniques which are ...

IEEE2009

The role of MHD in the sustainment of electron internal transport barriers and H-mode in TCV

Stefano Alberti, Timothy Goodman, Yves Martin, Olivier Sauter, Laurie Porte, Costanza Zucca

2008

A new concept for the collection of an electron beam configured by an externally applied axial magnetic field

Stefano Alberti, Jean-Philippe Hogge, Ioannis Pagonakis

2008

Electron thermal transport analysis in Tokamak a Configuration Variable

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

American Institute of Physics (AIP)2008

Status of development of the 2MW, 170GHz coaxial-cavity gyrotron for ITER

Stefano Alberti, Damien Fasel, Blaise Marlétaz, Philippe Marmillod, Albert Perez, Minh Quang Tran, Jean-Philippe Hogge, Ugo Siravo, Laurie Porte, Emmanuel Droz, Ioannis Pagonakis

2008

Parameterization Technique for the Preliminary Gun Design of the EU 170GHz 1MW Conventional Cavity gyrotron for ITER

Stefano Alberti, Jean-Philippe Hogge, Ioannis Pagonakis

2008

Experiments with real-time controlled ECW on the TCV Tokamak

Gilles Arnoux, Stefano Alberti, Basil Duval, Timothy Goodman, Jean-Marc Moret, Stefano Coda, Laurie Porte, Yann Camenen, James Paley

2007

The role of MHD in the sustainment of electron internal transport barriers and H-mode in TCV confinement during flat-top eITB plasmas on TCV

Stefano Alberti, Timothy Goodman, Olivier Sauter, Laurie Porte, Costanza Zucca

2007

ETG modelling of a TCV multi-phase H-mode shot

Stefano Alberti, Yves Martin, Olivier Sauter, Laurie Porte, Emiliano Fable, Ji Hyun Kim

2007

EU developments of the ITER ECRH system

Stefano Alberti, René Chavan

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

Numerical study of the effect of stray magnetic field on the beam quality of the 170 GHz, 2MW gyrotron gun for ITER

Stefano Alberti, Jean-Philippe Hogge, Ioannis Pagonakis

2007

EU megawatt-class 140-GHz CW gyrotron

Stefano Alberti, Minh Quang Tran, Jean-Philippe Hogge

The first series tube of the gyrotrons for the 10-MW electron cyclotron resonance heating system of the stellarator W7-X was tested at Forschungszentrum Karlsruhe (FZK) and yielded a total output power of 0.98 MW, with an,efficiency of 31% (without a singl ...

2007

The role of MHD in the sustainment of electron internal transport barriers and H-mode in TCV

Stefano Alberti, Timothy Goodman, Olivier Sauter, Laurie Porte, Costanza Zucca

2007

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