S. Coda

Details der Publikationsliste

Zeitraum

1994 - 2009

Anzahl

232

Co-Autoren

Diagnostic techniques for measuring suprathermal electron dynamics in plasmas (2008)

Coda, S

Plasmas, both in the laboratory and in space, are often not in thermodynamic equilibrium, and the plasma electron distribution function is accordingly non-Maxwellian. Suprathermal electron tails can...

Full Bootstrap Discharge Sustainment in Steady State in the TCV Tokamak (2008)

Coda, S., Sauter, O., Henderson, M.A., Goodman, T.P.

The Advanced Tokamak scenario, one of the modes of operation being considered for ITER, relies on the attainment of a high bootstrap current fraction. This scenario is typically characterized by an...

Diagnostic Techniques for Measuring Suprathermal Electron Dynamics in Plasmas (2008)

Coda, S.

Plasmas, both in the laboratory and in space, are often not in thermodynamic equilibrium, and the plasma electron distribution function is accordingly non-Maxwellian. Suprathermal electron tails can...

Physics Insight and Performance Benefit from Plasma Shaping Experiments in MHD and Energy Transport in the TCV Tokamak (2008)

Pochelon, A., Brunner, S., Camenen, Y., Coda, S., Graves, J., Marinoni, A., ...

The unique flexibility of TCV in plasma shaping has been exploited to address different aspects of tokamak physics in which the plasma shape may play a role. This paper summarizes the experiments...

Electron Bernstein Wave Core Deposition via O-X-B Double Mode Conversion in TCV (2008)

Curchod, L, Pochelon, A, Coda, S, Decker, J, Goodman, T P, Laqua, H P, ...

In the first results of electron Bernstein wave heating (EBWH) via O-X-B double mode conversion in a medium aspect ratio tokamak performed in TCV, the total power absorption efficiency was typically...

Recent electron cyclotron emission results on TCV (2007)

Udintsev, V. S., Turri, G., Asp, E., Schlatter, C., Goodman, T. P., Sauter, O., ...

Electron cyclotron emission (ECE) diagnostics on Tokamak a Configuration Variable (TCV) allow study of the electron temperature evolution in time with good spatial and temporal resolution at the high...

Plasma dynamics with second and third-harmonic ECRH and access to quasi-stationary ELM-free H-mode on TCV (2007)

Porte, L., Coda, S., Alberti, S., Arnoux, G., Blanchard, P., Bortolon, A., ...

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...

Real time control of the plasma current and elongation in tokamaks using ECRH actuators (2007)

Paley, J. I., Coda, S.

Real time control of the plasma elongation and plasma current using electron cyclotron resonance heating (ECRH) actuators has been demonstrated on TCV. Tokamak plasmas may be elongated by off-axis...

Demonstration of electron-Bernstein-wave heating in a tokamak via O-X-B double-mode conversion (2007)

Mueck, A., Curchod, L., Camenen, Y., Coda, S., Goodman, T. P., Laqua, H. P., ...

The first demonstration of electron-Bernstein-wave heating by double-mode conversion from the O to the X mode in an overdense H-mode tokamak plasma has been achieved in the Tokamak a Configuration...

Electron Bernstein wave heating and emission in the TCV tokamak (2007)

Mueck, A., Camenen, Y., Coda, S., Curchod, L., Goodman, T. P., Laqua, H. P., ...

Electron cyclotron resonance heating (ECRH) of high-density tokamak plasmas is limited because of reflections of the waves at so-called wave cutoffs. Electron Bernstein wave (EBW) heating (EBWH) via...

The physics of electron internal transport barriers in the TCV tokamak (2007)

Coda, S., Asp, E., Fable, E., Goodman, T. P., Sauter, O., Udintsev, V. S., ...

Electron internal transport barriers (elTBs) are generated in the TCV tokamak with strong electron cyclotron resonance heating in a variety of conditions, ranging from steady-state fully noninductive...

Impact of plasma triangularity and collisionality on electron heat transport in TCV L-mode plasmas (2007)

Camenen, Y., Pochelon, A., Behn, R., Bottino, A., Bortolon, A., Coda, S., ...

The impact of plasma shaping on electron heat transport is investigated in TCV L-mode plasmas. The study is motivated by the observation of an increase in the energy confinement time with decreasing...

Current profile tailoring using localized electron cyclotron heating in highly elongated TCV plasmas (2007)

Camenen, Y., Hofmann, Y. C. F., Pochelon, A., Scarabosio, A., Alberti, S., Arnoux, G., ...

Radially localized electron cyclotron heating (ECH) at the 2nd harmonic (X2) is used to tailor the current profile through the modification of the temperature, and hence conductivity, profiles. The...

Exploring a small sawtooth regime in Joint European Torus plasmas with counterinjected neutral beams (2006)

Nave, M. F. F., Koslowski, H. R., Coda, S., Graves, J., Brix, M., Buttery, R., ...

During a recent reversed toroidal field (B-T) campaign at the Joint European Torus (JET), experiments were performed to investigate the effect on sawteeth of neutral beam injection (NBI)-driven...

Design of a tangential phase contrast imaging diagnostic for the TCV tokamak - art. no. 10E929 (2006)

Marinoni, A., Coda, S., Chavan, R., Pochon, G.

A core density fluctuation imaging diagnostic is being developed for the TCV tokamak, employing a 7 cm wide CO2 laser beam transmitted through the plasma in a near-toroidal direction. The proposed...

Design of a tangential phase contrast imaging diagnostic for the TCV tokamak (2006)

Marinoni, A., Coda, S., Chavan, R., Pochon, G.

A core density fluctuation imaging diagnostic is being developed for the TCV tokamak, employing a 7 cm wide CO2 laser beam transmitted through the plasma in a near-toroidal direction. The proposed...

Inward thermodiffusive particle pinch in electron internal transport barriers in TCV (2006)

Fable, E., Sauter, O., Coda, S., Goodman, T. P., Henderson, M. A., Weisen, H., ...

Electron internal transport barriers (eITBs) are obtained in TCV with different heating and current drive schemes. They are sustained in steady-state conditions for several energy confinement and...

On ion cyclotron current drive for sawtooth control (2006)

Eriksson, L. G., Johnson, T., Mayoral, M. L., Coda, S., Sauter, O., Buttery, R. J., ...

Experiments using ion cyclotron current drive (ICCD) to control sawteeth are presented. In particular, discharges demonstrating shortening of fast ion induced long sawteeth reported in (Eriksson et...

The effect of ECRH on the electron velocity distribution function (2006)

Coda, S., Klimanov, I., Alberti, S., Arnoux, G., Blanchard, P., Fasoli, A.

Electron cyclotron resonance heating (ECRH) is a mature technology that has progressed constantly over a period of forty years, particularly as a tool in magnetic confinement fusion. As with other...

Inductive current density perturbations to probe electron internal transport barriers in tokamaks (2005)

Sauter, O., Coda, S., Goodman, T. P., Henderson, M. A., Behn, R., Bottino, A., ...

Improved electron energy confinement in tokamak plasmas, related to internal transport barriers, has been linked to nonmonotonic current density profiles. This is difficult to prove experimentally...

Rapid electron internal transport barrier formation during magnetic shear reversal in fully non-inductive TCV discharges (2005)

Henderson, M. A., Camenen, Y., Coda, S., Fable, E., Goodman, T. P., Nikkola, P., ...

The rapid formation of an electron internal transport barrier (eITB) is observed during a slow evolution (similar or equal to 200 ms) from a centrally peaked to a hollow current density profile,...

Sawtooth control in fusion plasmas (2005)

Graves, J. P., Angioni, C., Budny, R. V., Buttery, R. J., Coda, S., Eriksson, L. G., ...

Clear observations of early triggering of neo-classical tearing modes by sawteeth with long quiescent periods have motivated recent efforts to control, and in particular destabilize, sawteeth. One...

Safety factor profile requirements for electron ITB formation in TCV (2005)

Goodman, T. P., Behn, R., Camenen, Y., Coda, S., Fable, E., Henderson, M. A., ...

On the Tokamak a Configuration Variable (TCV), electron internal transport barriers (eITBs) can be formed during a gradual evolution from a centrally peaked to a hollow current profile while all...

High-bootstrap, noninductively sustained electron internal transport barriers in the Tokamak a Configuration Variable - art. no. 056124 (2005)

Coda, S., Goodman, T. P., Henderson, M. A., Sauter, O., Behn, R., Bottino, A., ...

Important ingredients of the advanced-tokamak route to fusion have been explored in depth in the Tokamak a Configuration Variable [F. Hofmann, J. B. Lister, M. Anton , Plasma Phys. Controlled Fusion...

High-bootstrap, noninductively sustained electron internal transport barriers in the Tokamak a Configuration Variable (2005)

Coda, S., Goodman, T. P., Henderson, M. A., Sauter, O., Behn, R., Bottino, A., ...

Important ingredients of the advanced-tokamak route to fusion have been explored in depth in the Tokamak a Configuration Variable [F. Hofmann, J. B. Lister, M. Anton , Plasma Phys. Controlled Fusion...

Electron heat transport in shaped TCV L-mode plasmas (2005)

Camenen, Y., Pochelon, A., Bottino, A., Coda, S., Ryter, F., Sauter, O., ...

Electron heat transport experiments are performed in L-mode discharges at various plasma triangularities, using radially localized electron cyclotron heating to vary independently both the electron...

Studies of burning plasma physics in the Joint European Torus (2004)

Mayoral, M. L., Buttery, R., Jones, T. T. C., Kiptily, V., Sharapov, S., Mantsinen, M. J., ...

In burning plasma experiments, the very energetic alpha (alpha) particles resulting from a deuterium-tritium fusion reaction will be the dominant heating mechanism and will give rise to new physics...

Rapid and localized electron internal-transport-barrier formation during shear inversion in fully noninductive TCV discharges (2004)

Henderson, M. A., Camenen, Y., Coda, S., Goodman, T. P., Nikkola, P., Pochelon, A., ...

Clear evidence is reported for the first time of a rapid localized reduction of core electron energy diffusivity during the formation of an electron internal-transport barrier. The transition occurs...

Control of electron internal transport barriers in TCV (2004)

Henderson, M. A., Behn, R., Coda, S., Condrea, I., Duval, B. P., Goodman, T. P., ...

Current profile tailoring has been performed by application of electron cyclotron heating (ECH) and electron cyclotron current drive, leading to improved energy confinement in the plasma core of the...

Destabilization of Fast-Ion-Induced Long Sawteeth by Localized Current Drive in the JET Tokamak (2004)

Eriksson, L.G., Mueck, A., Sauter, O., Coda, S., Mantsinen, M.J., Mayoral, M.L., ...

In a tokamak fusion reactor the energetic alpha particles will transiently stabilize the magnetohydrodynamic activity causing sawtooth oscillations. The crash events terminating long sawtooth free...

Destabilization of fast-ion-induced long sawteeth by localized current drive in the JET tokamak (2004)

Eriksson, L. G., Mueck, A., Sauter, O., Coda, S., Mantsinen, M. J., Mayoral, M. L., ...

In a tokamak fusion reactor the energetic alpha particles will transiently stabilize the magnetohydrodynamic activity causing sawtooth oscillations. The crash events terminating long sawtooth free...

Recent results from the electron cyclotron heated plasmas in Tokamak à Configuration Variable (TCV) (2003)

Henderson,M. A., Alberti,S., Angioni,C., Arnoux,G., Behn,R., Blanchard,P., ...

In noninductively driven discharges, 0.9 MW second harmonic (X2) off-axis co-electron cyclotron current drive deposition is combined with 0.45 MW X2 central heating to create an electron internal...

An overview of recent results from the TCV Tokamak (2003)

Goodman,T. P., Ahmed,S. M., Alberti,S., Andrèbe,Y., Angioni,C., Appert,K., ...

The TCV tokamak ( R = 0.88 m, κ = 2.5, are produced at low normalized current using far off-axis EC heating (ECH) and ECCD to broaden the current profile. Third harmonic heating is used to heat the...

Recent results from the electron cyclotron heated plasmas in Tokamak à Configuration Variable (TCV) (2003)

Henderson, M. A., Alberti, S., Angioni, C., Arnoux, G., Behn, R., Blanchard, P., ...

In noninductively driven discharges, 0.9 MW second harmonic (X2) off-axis co-electron cyclotron current drive deposition is combined with 0.45 MW X2 central heating to create an electron internal...

An overview of recent results from the TCV Tokamak (2003)

Goodman, T. P., Ahmed, S. M., Alberti, S., Andrèbe, Y., Angioni, C., Appert, K., ...

The TCV tokamak ( R = 0.88 m, κ = 2.5, are produced at low normalized current using far off-axis EC heating (ECH) and ECCD to broaden the current profile. Third harmonic heating is used to heat the...

Overview of JET results (2003)

Pamela, J., Solano, E. R., Adams, J. M., Agarici, G., Agarici, M., Akhter, H., ...

Scientific and technical activities on JET focus on the issues likely to affect the ITER design and operation. Our understanding of the ITER reference mode of operation, the ELMy H-mode, has...

Modelling of the electron cyclotron current drive experiments in the TCV tokamak (2003)

Nikkola, P., Sauter, O., Behn, R., Coda, S., Condrea, I., Goodman, T. P., ...

With the very high electron cyclotron (EC) wave power density achieved in the TCV tokamak, more than 20 MW m(-3), quasilinear modelling predicts an electron cyclotron current drive (ECCD) efficiency...

Investigation of the consistency of magnetic and soft X-ray plasma position measurements on TCV by means of a rapid tomographic inversion algorithm (2003)

Mlynar, J., Coda, S., Degeling, A., Duval, B. P., Hofmann, F., Goodman, T., ...

A rapid algorithm for tomographic inversion is presented that allows post-discharge reconstruction of the soft x-ray (SXR) emissivity evolution in the Tokamak a configuration variable (TCV)....

Accessibility and properties of ELMy H-mode and ITB plasmas in TCV (2003)

Martin, Y. R., Henderson, M. A., Alberti, S., Amorim, P., Andrebe, Y., Appert, K., ...

This paper presents experimental results on the accessibility and the properties of plasmas with improved confinement in TCV. First, the H-mode threshold power is measured in Ohmic plasmas. Above an...

Recent results from the electron cyclotron heated plasmas in Tokamak a Configuration Variable (TCV) (2003)

Henderson, M. A., Alberti, S., Angioni, C., Arnoux, G., Behn, R., Blanchard, P., ...

In noninductively driven discharges, 0.9 MW second harmonic (X2) off-axis co-electron cyclotron current drive deposition is combined with 0.45 MW X2 central heating to create an electron internal...

An overview of results from the TCV tokamak (2003)

Goodman, T. P., Ahmed, S. M., Alberti, S., Andrebe, Y., Angioni, C., Appert, K., ...

The Tokamak Configuration Variable (TCV) tokamak (R = 0.88 m, a < 0.25 m, B < 1.54 T) programme is based on flexible plasma shaping and heating for studies of confinement, transport, control and...

Electron cyclotron current drive and suprathermal electron dynamics in the TCV tokamak (2003)

Coda, S., Alberti, S., Blanchard, P., Goodman, T. P., Henderson, M. A., Nikkola, P., ...

Electron cyclotron current drive (ECCD) is an important prospective tool for tailoring the current profile in nextstep devices. To fill the remaining gaps between ECCD theory and experiment,...

Shape dependence of sawtooth inversion radii and profile peaking factors in TCV L mode plasmas (2002)

Weisen, H., Furno, I., Alberti, S., Angioni, C., Appert, K., Behn, R., ...

Sawtooth inversion radii and profile peaking factors of a large variety of ohmic and ECH heated L mode plasmas, including, elongations up to 2.6 and triangularities between -0.5 and 0.75, have been...

ECH physics and new operational regimes on TCV (2002)

Moret, J. M., Ahmed, S. M., Alberti, S., Andrebe, Y., Appert, K., Arnoux, G., ...

The physics of tokamak plasmas, in which electrons are heated by electron cyclotron heating (ECH) and whose current is driven by electron cyclotron current drive (ECCD), is investigated in this paper...

Extension of the TCV operating space towards higher elongation and higher normalized current (2002)

Hofmann, F., Coda, S., Lavanchy, P., Llobet, X., Marmillod, P., Martin, Y., ...

Recently, an experimental campaign has been launched on TCV with the aim of exploring and extending the limits of the operating space. The vertical position control system has been optimized, with...

High field side measurements of non-thermal electron cyclotron emission on TCV plasmas with ECH and ECCD (2002)

Blanchard, P., Alberti, S., Coda, S., Weisen, H., Nikkola, P., Klimanov, I.

Measurements of electron cyclotron emission (ECE) from the high field side of the TCV tokamak have been made on plasmas heated by second and third harmonic X-mode electron cyclotron heating (ECH) and...

Full absorption of third harmonic ECH in TCV tokamak plasmas in the presence of second harmonic ECCD (2002)

Alberti, S., Goodman, T. P., Henderson, M. A., Manini, A., Moret, J. M., Gomez, P., ...

An experimental study of the extraordinary mode (X mode) absorption at the third electron cyclotron harmonic frequency has been performed on the TCV tokamak in plasmas preheated by X mode at the...

Overview of TCV results (2001)

Weisen, H., Alberti, S., Angioni, C., Appert, K., Bakos, J., Behn, R., ...

The TCV tokamak (R = 0.88 in, a < 0.25 in, BT < 1.54 T) is equipped with six 0.5 MW gyrotron sources operating at 82.7 GHz for second harmonic X mode ECH. By distributing the ECCD current sources...

Sustained fully non-inductive scenarios using pressure and current profile control with ECCD (2001)

Sauter, O., Goodman, T. P., Coda, S., Henderson, M., Hofmann, F., Hogge, J. P., ...

The ECW system on Tokamak a configuration variable (TCV) allows the study of a wide range of poloidal and toroidal launch angles. Both electron cyclotron heating (ECH) and electron cyclotron current...

Steady-state fully noninductive operation with electron cyclotron current drive and current profile control in the tokamak a configuration variable (TCV) (2001)

Sauter, O., Angioni, C., Coda, S., Gomez, P., Goodman, T. P., Henderson, M. A., ...

Fully noninductive, steady-state electron cyclotron current drive (ECCD) has been demonstrated for the first time in experiments carried out in the tokamak a configuration variable (TCV) [O. Sauter ,...

Long-pulse improved central electron confinement in the TCV tokamak with electron cyclotron heating and current drive (2001)

Pietrzyk, Z. A., Angioni, C., Behn, R., Coda, S., Goodman, T. P., Henderson, M. A., ...

Current profile tailoring by electron cyclotron heating (ECH) and current drive (ECCD) is used to improve central electron energy confinement in the TCV tokamak. Counter-ECCD on axis alone achieves...

Hard X-ray CdTe tomography of tokamak fusion plasmas (2001)

Peysson, Y., Coda, S., Imbeaux, F.

A large CdTe-based tomographic system has been installed two years ago on the TORE SUPRA tokamak, for a detailed investigation of the dynamics of fast electrons generated by radio-frequency waves in...

Stability and energy confinement of highly elongated plasmas in TCV (2001)

Hofmann, F., Behn, R., Coda, S., Goodman, T. P., Henderson, M., Lavanchy, P., ...

The operating space of the TCV tokamak has been extended to higher elongation, kappa = 2.8, and higher normalized current, I-N = I-p/aB = 3.6MA/mT, than were previously attainable. This has been...

Signature of turbulent zonal flows observed in the DIII-D tokamak (2001)

Coda, S., Porkolab, M., Burrell, K.H.

The spectrum of turbulent density fluctuations at long poloidal wavelengths in the edge plasma of the DIII-D tokamak peaks at nonzero radial wave number. The associated electric-potential...

Characterization of density fluctuations during ELMs in the DIII-D tokamak (2001)

Coda, S., Porkolab, M., Burrell, K. H.

Bursts of turbulence associated with ELMs have been studied systematically in DIII-D with a multichannel phase contrast imaging (PCI) diagnostic, which is sensitive to the long poloidal wavelength...

Steady-state fully noninductive current driven by electron cyclotron waves in a magnetically confined plasma (2000)

Sauter, O., Henderson, M. A., Hofmann, F., Goodman, T., Alberti, S., Angioni, C., ...

A steady-state, fully noninductive plasma current has been sustained for the first time in a tokamak using electron cyclotron current drive only. In this discharge, 123 kA of current have been...

Central electron temperature enhancements due to sawtooth stabilization during counter electron cyclotron current drive in Tokamak a Configuration Variable (2000)

Pietrzyk, Z. A., Angioni, C., Behn, R., Coda, S., Goodman, T. P., Henderson, M. A., ...

In the Tokamak a Configuration Variable (TCV), the central electron temperature obtained in discharges with counter (CNTR) electron cyclotron current drive (ECCD) is larger than with CO-ECCD or...

Decorrelation of edge plasma turbulence at the transition from low- to high-confinement mode in the DIII-D Tokamak (2000)

Coda, S., Porkolab, M., Burrell, K. H.

The modification of turbulence in the edge plasma of the DIII-D tokamak at the transition from the low to the high mode of confinement is investigated with a phase-contrast imaging diagnostic. The...

High-power ECH and fully non-inductive operation with ECCD in the TCV tokamak (2000)

Coda, S., Goodman, T. P., Henderson, M. A., Hofmann, F., Pietrzyk, Z. A., Sauter, O., ...

Experiments with high-power electron cyclotron heating (ECH) and current drive (ECCD) in the TCV tokamak are discussed. Power up to 2.7 MW from six gyrotrons is delivered to the tokamak at the...

Energy confinement and MHD activity in shaped TCV plasmas with localized electron cyclotron heating (1999)

Pochelon, A., Goodman, T. P., Henderson, M., Angioni, C., Behn, R., Coda, S., ...

Confinement in TCV electron cyclotron heated discharges was studied as a function of plasma shape, i.e. as a function of elongation, 1.1 < kappa < 2.15, and triangularity, -0.65 less than or equal to...

Effect of plasma shape on confinement and MHD behaviour in TCV (1997)

Weisen, H., Alberti, S., Berry, S., Behn, R., Blanchard, P., Bosshard, P., ...

The TCV tokamak (B-T < 1.5 T, R approximate to 0.88 m, a < 0.25 m) has produced a wide variety of plasma configurations, both diverted and limited, with elongations kappa(a), ranging from 0.9 to...

Overview of H-Mode Studies in Diii-D (1994)

Groebner, R. J., Allen, S. L., Baker, D. R., Brooks, N. H., Buchenauer, D. A., Burrell, K. H., ...

A major portion of the DIII-D program includes studies of the L-H transition, of the VH-mode, of particle transport and control and of the power-handling capability of a divertor. Significant...