Thermal and non-thermal particle interaction with the LHCD launchers in Tore Supra

Goniche, M.; Balorin, C.; Basiuk, V.; Bibet, P.; Chantant, M.; Colas, L.; Delpech, L.; Desgranges, C.; Eriksson, L.‐G.; Joffrin, E.; Kazarian, F.; Lowry, C.; Moreau, Ph.; Petržı́lka, V.; Portafaix, C.; Prou, M.; Roche, Hélène

doi:10.1016/j.jnucmat.2007.01.245

Cited by 7 publications

(2 citation statements)

References 6 publications

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“…Secondly, there is a ripple stochastic diffusion, which causes ions to escape the plasma towards the low field side, at the mid-plane or below. This is particularly evident on the LHCD launchers, showing a characteristic hot spot below the mid-plane on the ion drift side [23]. Similar results were also reported from JT60-U [24].…”

Section: Experimental Observationssupporting

confidence: 84%

“…Since the energy of the fast ions (E Fast ) scales as E Fast ∝ P ICRH T 3/2 e0 /(n e n res ), where n e is the electron density and n res is the density of the resonating ions [12], it is clear that working at higher density is beneficial for reducing the heat load on the antennas due to fast ion losses. The effect of the density, as well as on the ICRH power, has been verified experimentally in [23]. Indeed, it was found that the relative temperature increase on the LHCD launcher could be related to the parameter E Fast ∝ P ICRH T 3/2 e0 /(n e n res ).…”

Section: Parametric Dependences Of Fast Ion Lossesmentioning

confidence: 86%

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Operational limits during high power long pulses with radiofrequency heating in Tore Supra

Ekedahl¹,

Bucalossi²,

Basiuk³

et al. 2009

Nucl. Fusion

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Issues related to the limitations and optimization of long pulse operation at high radiofrequency (RF) power levels in the Tore Supra tokamak are presented. An increasing operational limitation was encountered during the experimental campaigns in 2006–2007, affecting the high power and long pulse performance. This limitation was characterized by the sudden appearance of a multifaceted asymmetric radiation from the edge (MARFE), often followed by a disruption. The analyses revealed that the limitation could be linked to over-heating and flaking of the carbon re-deposition layers on the main plasma facing components (PFCs). The carbon deposits on all PFCs were therefore completely removed during the winter shutdown 2007–2008. Following this, a remarkable improvement in the injected power capability was observed, resulting in almost 12 MW of injected power during 10 s, without any of the previous signs of limitation (MARFE, disruption). Furthermore, the RF antennas are subject to localized heat loads due to RF sheath effects and interaction by fast particles, effects which need to be minimized in particular for long pulse operation. Experimental results concerning the heat load on the antennas, caused by fast ion losses in the presence of magnetic ripple, are presented in this paper.

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Section: Experimental Observationssupporting

confidence: 84%

Section: Parametric Dependences Of Fast Ion Lossesmentioning

confidence: 86%

Operational limits during high power long pulses with radiofrequency heating in Tore Supra

Ekedahl¹,

Bucalossi²,

Basiuk³

et al. 2009

Nucl. Fusion

Self Cite

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show abstract

Heat flux calculation and problem of flaking of boron carbide coatings on the Faraday screen of the ICRH antennas during Tore Supra high power, long pulse operation

Corre

Lipa

Agarici

et al. 2011

Fusion Engineering and Design

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Probing the plasma near high power wave launchers in fusion devices for static and dynamic electric fields (invited)

Martin

Isler

Colas

et al. 2014

Review of Scientific Instruments

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An exploratory study was carried out in the long-pulse tokamak Tore Supra, to determine if electric fields in the plasma around high-power, RF wave launchers could be measured with non-intrusive, passive, optical emission spectroscopy. The focus was in particular on the use of the external electric field Stark effect. The feasibility was found to be strongly dependent on the spatial extent of the electric fields and overlap between regions of strong (>∼1 kV/cm) electric fields and regions of plasma particle recycling and plasma-induced, spectral line emission. Most amenable to the measurement was the RF electric field in edge plasma, in front of a lower hybrid heating and current drive launcher. Electric field strengths and direction, derived from fitting the acquired spectra to a model including time-dependent Stark effect and the tokamak-range magnetic field Zeeman-effect, were found to be in good agreement with full-wave modeling of the observed launcher.

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Thermal and non-thermal particle interaction with the LHCD launchers in Tore Supra

Cited by 7 publications

References 6 publications

Operational limits during high power long pulses with radiofrequency heating in Tore Supra

Operational limits during high power long pulses with radiofrequency heating in Tore Supra

Heat flux calculation and problem of flaking of boron carbide coatings on the Faraday screen of the ICRH antennas during Tore Supra high power, long pulse operation

Probing the plasma near high power wave launchers in fusion devices for static and dynamic electric fields (invited)

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