R. Behn

Details der Publikationsliste

Zeitraum

1980 - 2009

Anzahl

248

Co-Autoren

Modulated ECCD experiments on TCV EX/P3-3 (2009)

S. Cirant, S. Alberti, R. Behn, T. P. Goodman, E. Lazzaro

Abstract Experiments were previously performed on TCV using Switched Electron Cyclotron Current Drive (SECCD) in which the total heating power and plasma current were kept nearly constant in time...

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...

SOLPS5 modelling of the type III ELMing H-mode on TCV (2007)

Gulejova, B., Pitts, R. A., Wischmeier, M., Behn, R., Coster, D., Horacek, J., ...

Although ohmic H-modes have long been produced on TCV and the effects of ELMs at the divertor target studied in some detail, no attempt has yet been made to model the scrape-off layer (SOL) in these...

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...

Edge profiles of electron temperature and density during ELMy H-mode in ohmically heated TCV plasmas (2007)

Behn, R., Allier, A., Medvedev, S. Y., Zhuang, G., Pasqualotto, R., Nielsen, P., ...

Improvement of the spatial resolution of the TCV Thomson scattering system has permitted measurements of the pedestal height and gradient of electron density and temperature profiles near; the plasma...

Shear modulation experiments with ECCD on TCV (2006)

Cirant, S., Alberti, S., Gandini, F., Behn, R., Goodman, T., Nikkola, P.

Anomalous electron transport is determined by turbulence, which in turn is affected by magnetic shear. A novel application of electron cyclotron current drive (ECCD), aiming at localized shear...

10-channel far-infrared polarimeter for the tokamak configuration variable - art. no. 10F101 (2006)

Blanchard, P., Behn, R., Weisen, H., Zhuchkova, A.

A new far-infrared polarimeter diagnostic for the tokamak a configuration variable (TCV) is under construction at CRPP. It uses two FIR lasers at 432.5 mu m, optically pumped by a 120 W continuous...

10-channel far-infrared polarimeter for the tokamak configuration variable (2006)

Blanchard, P., Behn, R., Weisen, H., Zhuchkova, A.

A new far-infrared polarimeter diagnostic for the tokamak a configuration variable (TCV) is under construction at CRPP. It uses two FIR lasers at 432.5 mu m, optically pumped by a 120 W continuous...

Influence of non-Maxwellian velocity distributions during ECRH and ECCD on electron temperature measurements by Thomson scattering (2005)

Zhuang, G., Behn, R., Klimanov, I., Nikkola, P., Sauter, O.

Deposition of electron cyclotron waves at high-power densities for heating and current drive in a tokamak plasma generates a population of fast electrons and therefore the velocity distribution of...

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...

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...

A new method for the inversion of interferometry data using basis functions derived from singular value decomposition of local measurements in tokamak plasmas (2005)

Furno, I., Weisen, H., Carey, C., Angioni, C., Behn, R., Fable, E., ...

A novel method for inverting time-resolved line-integrated interferometric plasma density measurements is described. The method uses singular value decomposition of local density profiles from...

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...

The influence of molecular dynamics on divertor detachment in TCV (2004)

Wischmeier, M., Pitts, R. A., Alfier, A., Andrebe, Y., Behn, R., Coster, D., ...

If vibrationally excited molecules are discretised into individual species and proper account is taken of the toroidal geometry in simulating neutrals, some improvement can be made in simulating the...

Status of and prospects for advanced tokamak regimes from multi-machine comparisons using the 'International Tokamak Physics Activity' database (2004)

Litaudon, X., Barbato, E., Becoulet, A., Doyle, E. J., Fujita, T., Gohil, P., ...

Advanced tokamak regimes obtained in ASDEX Upgrade, DIII-D, FF-U, JET, JT-60U, TCV and Tore Supra experiments are assessed both in terms of their fusion performance and capability for ultimately...

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...

Application of the singular value decomposition method for inversion of interferometer measurements in fusion plasmas (2004)

Carey, C. S., Furno, I., Weisen, H., Behn, R., Fable, E., Angioni, C.

We present applications of a recently developed method, the singular value decomposition inversion (SVD-I), for inverting line integrated multichannel interferometer measurements in fusion devices....

INSTITUTE OF PHYSICS PUBLISHING PLASMA PHYSICS AND CONTROLLED FUSION (2004)

I Furno, H Weisen, C Carey, C Angioni, R Behn, E Fable, ...

A new method for the inversion of interferometry data using basis functions derived from singular value decomposition of local measurements in tokamak plasmas

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...

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...

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...

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...

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...

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...

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...

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...

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...

"Profile consistency" features in strongly shaped Ohmic tokamak plasmas (1999)

Weisen, H., Behn, R., Furno, I., Moret, J. M., Sauter, O.

A large variety of shaped tokamak discharges have been created in the Tokamak a Configuration Variable (TCV) with main parameters B-T

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,...

A Thomson scattering diagnostic for measurements in the divertor region of TCV (1999)

Behn, R., Rommers, J. H., Pitts, R. A., Pietrzyk, Z. A., Chavan, R., Marletaz, B.

For future divertor studies on TCV measurements of electron temperature and density and their spatial gradients along open flux surfaces will be of major interest. A Thomson scattering system is...

'Profile consistency' features in shaped sawtoothing ohmic TCV plasmas (1998)

Weisen, H., Behn, R., Furno, I., Moret, J. M., Sauter, O.

A large variety of plasma conditions has been created in TCV (Tokamak a Configuration Variable, B-T < 1.5 T, R-0 = 0.88 m, a < 0.25 m). They include limited and diverted discharges with elongations...

Analysis of phase measurements in combined interferometer and polarimeter systems (1998)

Rommers, J. H., Barry, S., Behn, R., Nieswand, C.

Combined interferometer and polarimeter systems, using a single detecting element per line of sight, are susceptible to perturbation of the interferometric phase when modulation of the polarization...

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

Weisen, H., Moret, J. M., Franke, S., Furno, I., Martin, Y., Anton, M., ...

The energy confinement time of TCV ohmic L mode discharges depends strongly on plasma shape. For fixed average current and electron densities, confinement times increase with plasma elongation and...

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...

Divertor target profiles and recycling studies in TCV single null lower standard discharges (1997)

Pitts, R. A., Nieswand, C., Weisen, H., Anton, M., Behn, R., Chavan, R. F., ...

A 'standard', single null lower diverted discharge has been developed to enable continuous monitoring of the first wall conditions and to characterise the effectiveness and influence of wall...

Influence of plasma shape on transport in the TCV Tokamak (1997)

Moret, J. M., Franke, S., Weisen, H., Anton, M., Behn, R., Duval, B. P., ...

The energy confinement time of TCV Ohmic, L-mode discharges is observed to depend strongly on the plasma shape, improving slightly with elongation and degrading strongly as triangularity is increased...

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...

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...

Vorrichtung zur Signaluebertragung (1994)

Weisener, T., Behn, R., Flaig, T.

A device for signal transmission for application in industrial robots with at least two transmission modules intercommunicating over a transmission link is characterized by the transmission modules...

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...

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...

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...