A. Pochelon

Details der Publikationsliste

Zeitraum

1974 - 2009

Anzahl

339

Co-Autoren

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...

Plasma shape stabilization of current rise MHD instabilities in TCV (2007)

Scarabosio, A., Pochelon, A., Martin, Y.

The well-known and potentially disruptive plasma 'current rise' instabilities are studied as a function of the plasma shape in the Tokamak a a Configuration Variable (TCV). Disruptions typically...

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...

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...

Toroidal plasma rotation in the TCV tokamak (2006)

Scarabosio, A., Bortolon, A., Duval, B. P., Karpushov, A., Pochelon, A.

The first toroidal rotation measurements in TCV ohmic L-mode plasmas with no external momentum injection are presented. The toroidal velocity profile of the fully stripped carbon species is measured...

Sawtooth behaviour in highly elongated TCV plasmas (2006)

Reimerdes, H., Furno, I., Hofmann, F., Martynov, A., Pochelon, A., Sauter, O.

The effect of plasma elongation kappa on the sawtooth behaviour is studied in ohmically heated TCV plasmas up to values of kappa = 2.8. Above a certain value of kappa, which varies from 2.2 to 2.6...

Observation of spontaneous toroidal rotation inversion in ohmically heated Tokamak plasmas (2006)

Bortolon, A., Duval, B. P., Pochelon, A., Scarabosio, A.

Bulk plasma toroidal rotation is observed to invert spontaneously from counter to cocurrent direction in TCV (Tokamak a Configuration Variable) Ohmically heated discharges, in low confinement mode,...

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,...

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...

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...

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...

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...

Sawtooth, neo-classical tearing mode and error field studies in JET (2003)

Hender,T. C., Sauter,O., Alper,B., Angioni,C., De Baar,M. R., De Benedetti,M., ...

A range of ITER relevant plasma stability issues has been studied in the JET tokamak; these include the effects of fast particles on sawteeth, control of NTMs via sawtooth seeds, scaling of m=2, n=1...

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...

Sawtooth, neo-classical tearing mode and error field studies in JET (2003)

Hender, T. C., Sauter, O., Alper, B., Angioni, C., De Baar, M. R., De Benedetti, M., ...

A range of ITER relevant plasma stability issues has been studied in the JET tokamak; these include the effects of fast particles on sawteeth, control of NTMs via sawtooth seeds, scaling of m=2, n=1...

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...

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...

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...

From current-driven to neoclassically driven tearing modes (2002)

Reimerdes, H., Sauter, O., Goodman, T., Pochelon, A.

In the TCV tokamak, the m/n = 2/1 island is observed in low-density discharges with central electron-cyclotron current drive. The evolution of its width has two distinct growth phases, one of which...

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...

MHD stability with strongly reversed magnetic shear in JET (2002)

Hender, T. C., Hennequin, P., Alper, B., Hellsten, T., Howell, D. F., Huysmans, G. T. A., ...

Recent operation of JET with centrally strongly reversed magnetic shear, produced with the help of lower hybrid current drive, has extended the domain in which internal transport barriers (ITBs) can...

Neutral beam stabilization of sawtooth oscillations in JET (2002)

Angioni, C., Pochelon, A., Gorelenkov, N. N., McClements, K. G., Sauter, O., Budny, R. V., ...

Recent experiments in the Joint European Torus (JET) have provided evidence of sawtooth stabilization by fast ions arising from deuterium neutral beam injection (NBI). A possible theoretical basis...

Sawtooth, Neo-Classical Tearing Mode and Error Field Studies in JET (2002)

T.C. Hender, O. Sauter, B. Alper, C. Angioni, M. Baar, M. Benedetti, ...

A range of ITER relevant plasma stability issues have been studied in the JET tokamak; these include the effects of fast particles on sawteeth, control of NTMs via sawteeth seeds, scaling of (2,1)...

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...

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 ,...

Plasma shape effects on sawtooth/internal kink stability and plasma shaping using electron cyclotron wave current profile tailoring in TCV (2001)

Pochelon, A., Hofmann, F., Reimerdes, H., Angioni, C., Behn, R., Duquerroy, R., ...

The effect of plasma shaping (triangularity and elongation) on sawtooth stability is addressed as well as the technique of current profile broadening using off-axis ECH to enlarge the operational...

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...

Poloidally asymmetric plasma response with ECH deposition near q=1 in TCV (2001)

Henderson, M. A., Goodman, T. P., Hogge, J. P., Pietrzyk, Z. A., Pochelon, A., Sauter, O.

A small component of ECCD exists when heating off-axis with no toroidal injection due to the field helicity. The sign of the ECCD will change depending on the absorption location in a poloidal plane,...

Understanding sawtooth activity during intense electron cyclotron heating experiments on TCV (2001)

Furno, I., Angioni, C., Porcelli, F., Weisen, H., Behn, R., Goodman, T. P., ...

Different types of central relaxation oscillations are observed in the presence of ECH depending on the location of the deposited power. In the TCV tokamak, normal sawteeth, i.e. triangular sawteeth...

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...

Effect of triangular and elongated plasma shape on the sawtooth stability (2000)

Reimerdes, H., Pochelon, A., Sauter, O., Goodman, T. P., Henderson, M. A., Martynov, A.

In the TCV tokamak the sawtooth period and the sawtooth amplitude are observed to depend strongly on the shape of the poloidal plasma cross section. Systematic scans of plasma elongation and...

Model for humpback relaxation oscillations (2000)

Porcelli, F., Angioni, C., Behn, R., Furno, I., Goodman, T., Henderson, M. A., ...

An interpretation of non-standard, central MHD events in the TCV tokamak during localized ECRH is presented. It is shown that the non-standard behaviour is a consequence of specific features in the...

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...

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...

Behaviour of central plasma relaxation oscillations during localized electron cyclotron heating on the TCV tokamak (1999)

Pietrzyk, Z. A., Pochelon, A., Goodman, T. P., Henderson, M. A., Hogge, J. P., Reimerdes, H., ...

During initial studies of ECRH in the TCV tokamak, non-standard central MHD activities, such as humpbacks and saturated and inverted sawteeth, have been observed while changing the heating location,...

Toroidally asymmetric ELM precursors in TCV (1998)

Reimerdes, H., Pochelon, A., Suttrop, W.

Coherent magnetic oscillations precede edge localized modes (ELMs) in TCV. The precursor has been detected prior to ELMs considered to be of type III and others previously referred to as TCV large:...

Experimental and theoretical stability limits of highly elongated tokamak plasmas (1998)

Hofmann, F., Sauter, O., Reimerdes, H., Furno, I., Pochelon, A.

Stability limits of highly elongated, D-shaped plasmas have been measured in the TCV (tokamak a configuration variable) tokamak. It is found that the plasma current is limited by kink-type...

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...

Ohmic H-modes in the TCV tokamak (1996)

Weisen, H., Hofmann, F., Dutch, M. J., Martin, Y., Pochelon, A., Moret, J. M., ...

The TCV tokamak has obtained ohmic H-modes in virtually all diverted plasmas with the ion del B drift directed towards an X-point and in several elongated limiter plasmas. Troyon factors...

Effect on confinement of edge-localized modes in TCV (1996)

Weisen, H., Dutch, M. J., Hofmann, F., Martin, Y., Moret, J. M., Nieswand, C., ...

The effect of ELMs on confinement in ohmic H-modes has been investigated by analysing the rates of change of global parameters such as the electron content and the stored energy as a function of ELM...

Measurement of the optical depth at the third electron cyclotron harmonic in tore supra (1996)

Segui, J. L., Michelot, Y., Giruzzi, G., Goodman, T. P., Kritz, A. H., Pochelon, A., ...

The linear relativistic theory of electron cyclotron wave propagation predicts partial absorption of the extraordinary mode at the third electron cyclotron harmonic for typical parameters of present...

Recent Results from the Tcv Tokamak (1995)

Weisen, H., Hoffmann, F., Dutch, M. J., Moret, J. M., Lister, J. B., Pochelon, A., ...

During the first two years of operation, the TCV tokamak has produced a large variety of plasma shapes and magnetic configurations, with 1.0 less than or equal to B-tor less than or equal to 1.46T,...

Ohmic H-mode and confinement in TCV (1995)

Moret, J. M., Anton, M., Barry, S., Behn, R., Besson, G., Buhlmann, F., ...

The unique flexibility of TCV for the creation of a wide variety of plasma shapes has been exploited to address some aspects of tokamak physics for which the shape may play an important role. The...

Elm Control During Double-Null Ohmic H Modes in Tcv (1995)

Dutch, M. J., Hofmann, F., Duval, B. P., Corboz, M., Hirt, A., Joye, B., ...

Precise control of the shape and position of double-null divertor configurations in the TCV tokamak has been used to trigger reliably the transition from ELM-free to ELMy ohmic H mode and back....

Creation and Control of Variably Shaped Plasmas in Tcv (1994)

Hofmann, F., Lister, J. B., Anton, M., Barry, S., Behn, R., Bernel, S., ...

During the first year of operation, the TCV tokamak has produced a large variety of plasma shapes and magnetic configurations, with 1.0 less than or equal to B(tor)less than or equal to 1.46T, I-p...

Mhd Activity During H-Mode Discharges on the Tcv Tokamak (1994)

Hirt, A., Duval, B. P., Moret, J. M., Pochelon, A., Tonetti, G., Weisen, H.

Ohmic H-mode has been regularly obtained on the TCV tokamak. This paper describes the change in magnetic activity occuring at the transition, the coherent activity during H-mode, a brief description...

Electron-Cyclotron Resonance Heating on the Tca Tokamak (1993)

Pietrzyk, Z. A., Pochelon, A., Behn, R., Bondeson, A., Dutch, M., Goodman, T. P., ...

Electron cyclotron resonance heating (ECRH) experiments at 39 GHz with power levels similar to those of Ohmic heating have been conducted in the TCA tokamak, in either the X-mode or the O-mode. ECRH...

X-Mode and O-Mode Electron-Cyclotron Heating Breakdown and Startup in Tca (1992)

Whaley, D. R., Goodman, T. P., Pochelon, A., Behn, R., Cardinali, A., Duval, B. P., ...

A comparative study of X- and O-mode high field side launch for electron cyclotron heating (ECH) breakdown and startup of tokamak plasmas has been performed. It is found that X-mode power is not...

Density Limits and Disruptions in the Tca Tokamak (1992)

Pietrzyk, Z. A., Pochelon, A., Behn, R., Bondeson, A., Duperrex, P. A., Duval, B. P., ...

Density limit disruptions have been studied during the current flat-top of TCA. Disruption occurs at two different densities, depending on discharge programming. The highest densities are achieved by...

Global Sawtooth Instability Measured by Magnetic Coils in the Jet Tokamak (1992)

Duperrex, P. A., Pochelon, A., Edwards, A. W., Snipes, J. A.

The paper describes measurements of the sawtooth instability in JET, in which the instability wave function is shown to extend to the edge where it is measured using magnetic coils. The numerous...

Ion Temperature-Measurements in a Tokamak by Collective Thomson Scattering (1991)

Siegrist, M. R., Behn, R., Dicken, D., Duval, B. P., Hackmann, J., Joye, B., ...

Collective Thomson scattering, using a high-power pulsed D2O laser at 385-mu-m and a heterodyne receiver system, has provided local ion temperature (T(i)) measurements of the plasma in the tokamak...