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Timothy Goodman

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Publications associées (188)

The ITER EC H&CD upper launcher: Structural design

René Chavan, Timothy Goodman, Jean-Daniel Landis

Four ITER EC H&CD (Electron Cyclotron Heating and Current Drive) Upper Launchers will be installed in the ITER Tokamak to counteract plasma instabilities by injection of up to 20 MW of millimeter-wave power at 170 GHz. Each Launcher features a structural s ...

Elsevier2011

Overview of the ITER EC H&CD system and its capabilities

Stefano Alberti, René Chavan, Timothy Goodman, Olivier Sauter, Minh Quang Tran, Jean-Philippe Hogge, Jean-Daniel Landis, Hartmut Zohm, Laurie Porte, Robert Bertizzolo, Francisco Sanchez, Ioannis Pagonakis, Emanuele Poli

The Electron Cyclotron (EC) system for the ITER tokamak is designed to inject >= 20 MW RF power into the plasma for Heating and Current Drive (H&CD) applications. The EC system consists of up to 26 gyrotrons (between 1 and 2 MW each), the associated power ...

Elsevier2011

The ITER EC H&CD upper launcher: Analysis of remote handling compatibility

René Chavan, Timothy Goodman

The present design of the ECH (Electron Cyclotron Heating) upper port launcher has been evaluated in light of the ITER remote handling (RH) requirements. Changes to the launcher design associated with the accessibility, maintainability and manageability of ...

Elsevier2011

Sawtooth pacing by real-time auxiliary power control in a tokamak

Timothy Goodman, Olivier Sauter, Jonathan Graves, Federico Alberto Alfredo Felici

In the standard scenario of tokamak plasma operation, sawtooth crashes are the main perturbations that can trigger performance-degrading, and potentially disruption-generating, neoclassical tearing modes. This Letter demonstrates sawtooth pacing by real-ti ...

American Physical Society2011

Real-time physics-model-based simulation of the current density profile in tokamak plasmas

Basil Duval, Timothy Goodman, Jean-Marc Moret, Olivier Sauter, Stefano Coda, James Paley, Federico Alberto Alfredo Felici

A new paradigm is presented to reconstruct the plasma current density profile in a tokamak in real-time. The traditional method of basing the reconstruction on real-time diagnostics combined with a real-time Grad-Shafranov solver suffers from the difficult ...

IOP Publishing Ltd2011

Multiple EC power deposition locations tracking by break-in-slope analysis in TCV plasmas

Timothy Goodman, Jean-Marc Moret, Antoine Pochelon, Loïc Curchod, James Paley, Federico Alberto Alfredo Felici, Joan Decker

Modulation of the amplitude of externally injected electron cyclotron (EC) power is a frequent method used to determine the radial power deposition profile in fusion plasmas. There are many tools to analyze the plasma response to the power modulations unde ...

2011

Progress on the ITER H&D EC Upper Launcher Steering-Mirror Control System

René Chavan, Timothy Goodman, Jean-Daniel Landis, Robert Bertizzolo, Francisco Sanchez, Frédéric Dolizy, Federico Alberto Alfredo Felici

The ITER Heating and Current Drive Upper Launcher (H&CD EC UL) uses a pneumomechanical steering-mirror assembly (SMA) to steer the RF beams for their deposition in the appropriate location in the plasma to control magnetohydrodynamic activity (neoclassical ...

Institute of Electrical and Electronics Engineers2010

Feedback control of ECRH polarization on LHD

Timothy Goodman, Olivier Sauter, Federico Alberto Alfredo Felici

The polarization of ECRH waves, set by the orientation of a pair of corrugated mirror polarizers in the transmission line, determines the degree of coupling to O- and X-modes in the plasma and has an important effect on the first-pass absorption. Existing ...

IOP Publishing Ltd2010

Fast polarizers installation for ECRH and ECE in TCV

Timothy Goodman, Laurie Porte, Federico Alberto Alfredo Felici

We report on the installation of fast polarizers for ECRH injection and ECE diagnostics, in the TCV tokamak. The main goal is to change the polarization during a plasma shot and react to changing conditions such as: plasma current and position, ECRH inject ...

2010

Real-time feedback control of millimeter-wave polarization for LHD

Timothy Goodman, Olivier Sauter, Federico Alberto Alfredo Felici

Electron cyclotron heating (ECH) is widely used in magnetic fusion devices, and the polarization of the injected millimeter-wave beams plays a crucial role in the propagation and absorption of the beam energy by the plasma. This polarization can be adjuste ...

AIP2009

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

From sawtooth to profile control: developing feedback control using ECRH/ECCD systems on the TCV tokamak

Timothy Goodman, Stefano Coda, James Paley, Federico Alberto Alfredo Felici

Real time control of heating systems is essential to maximize plasma performance and avoid or neutralize instabilities under changing plasma conditions. Several feedback control algorithms have been developed on the Tokamak a Configuration Variable (TCV) t ...

Plasma Phys. Control. Fusion2009

Real time control of plasmas and ECRH systems on TCV

Basil Duval, Timothy Goodman, Yves Martin, Jean-Marc Moret, Stefano Coda, James Paley, Francesco Piras, Federico Alberto Alfredo Felici

Developments in the real time control hardware on Tokamak à Configuration Variable (TCV) coupled with the flexibility of plasma shaping and electron cyclotron (EC) heating and current drive actuators are opening many opportunities to perform real time expe ...

IOP Publishing Ltd2009

Current density evolution in electron internal transport barrier discharges in TCV

Timothy Goodman, Olivier Sauter, Stefano Coda, Emiliano Fable, Costanza Zucca

Simulations of the plasma current density evolution in electron internal transport barrier discharges on the Tokamak a Configuration Variable (TCV) have been performed, in order to determine the relationship between the safety-factor profile and the electr ...

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

Real time control of the sawtooth period using EC launchers

Timothy Goodman, Stefano Coda, James Paley, Francesco Piras, Federico Alberto Alfredo Felici

Tokamak plasmas operating at high performance are limited by several MHD instabilities. The sawtooth instability limits the core plasma pressure and can drive the neoclassical tearing mode unstable, but also prevents accumulation of impurities in the core. ...

Plasma Phys. Control. Fusion2009

Progress on the ITER Electron Cyclotron Heating and Current Drive Upper Launcher Steering Mirror Control System

René Chavan, Timothy Goodman, Jean-Daniel Landis, Robert Bertizzolo, Francisco Sanchez, Frédéric Dolizy, Federico Alberto Alfredo Felici

The ITER ECRH upper launcher (UL) uses a steering mechanism assembly (SMA) to steer the beams in the appropriate location for controlling magnetohydrodynamic (MILD) activity in the plasma (NTMs and sawtooth oscillations). ...

IEEE2009

Global plasma oscillations in electron internal transport barriers in TCV

Timothy Goodman, Olivier Sauter, Andrea Scarabosio, Jonathan Graves, Emiliano Fable, Costanza Zucca

2008

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