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Pedestal evolution physics in low triangularity JET tokamak discharges with ITER-like wall

Publications associées (101)

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Towards the realization on JET of an integrated H-mode scenario for ITER

Olivier Sauter

ELMy H-mode experiments at JET in 2000/mid-2002 have focused on discharges with normalized parameters for plasma density, energy confinement and beta similar to those of the ITER Q(DT) = 10 reference regime (n/n(GW) similar to 0.85, H-98(y,H-2) similar to ...

2004

Simulations of global electrostatic microinstabilities in ASDEX Upgrade discharges

Olivier Sauter, Laurent Villard, Alberto Bottino

Electrostatic microinstabilities in ion internal barrier (ITB) and H-mode discharges of the ASDEX Upgrade tokamak [O. Gruber, R. Arslanbekov, C. Atanasiu , Nucl. Fusion 41, 1369 (2001)] have been investigated with a full radius gyrokinetic code. The code m ...

2004

Edge localized modes in DIII-D high performance discharges

Olivier Sauter, Hartmut Zohm

A new understanding of edge localized modes (ELMs) in tokamak discharges is emerging (Snyder P B et al 2002 Phys. Plasmas 9 2037), in which the ELM is an essentially ideal magnetohydrodynamic (MHD) instability and the ELM severity is determined by the radi ...

2003

Recent advances in the LHD experiment

Wilfred Anthony Cooper, Terunobu Akiyama, Kenji Tanaka

In the first four years of the LHD experiment, several encouraging results have emerged, the most significant of which is that MHD stability and good transport are compatible in the inward shifted axis configuration. The observed energy confinement at this ...

2003

Divertor detachment during pure helium plasmas in JET

Richard Pitts, Marco Wischmeier

A campaign of pure helium discharges in the JET tokamak equipped with the MarkIIGB divertor has been performed. This paper describes some of the experimental observations of divertor detachment obtained in L-mode density ramp He discharges and presents a s ...

2003

From current-driven to neoclassically driven tearing modes

Olivier Sauter, Timothy Goodman, Holger Reimerdes, Antoine Pochelon

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 can be linked to a "conventional" tearing mode driven unst ...

2002

Long timescale density peaking in JET

Olivier Sauter

Long timescale density peaking has been observed in JET plasmas leading to densities exceeding the Greenwald value. These neutral beam heated discharges are characterized by type-I ELMS and good energy confinement. Central density is limited by neoclassica ...

2002

Search for determinism in ELM time series in TCV

Yves Martin, Jonathan Bryan Lister

ELM time series from TCV Ohmic H-mode plasmas are analysed in order to extract information on the ELM process. Firstly, signatures of a chaotic behaviour called unstable periodic orbits become visible when particular plasma conditions are reached. Secondly ...

2002

Modelling of electron transport and of sawtooth activity in tokamaks

Transport phenomena in tokamak plasmas strongly limit the particle and energy confinement and represent a crucial obstacle to controlled thermonuclear fusion. Within the vast framework of transport studies, three topics have been tackled in the present the ...

EPFL2001

Characterization of impurities in L- and H-modes created by divertor biasing and plasma triangularity in TdeV

A characterization of the H-mode in Tokamak de Varennes (TdeV) is presented, combining results obtained from spectroscopic measurements with observations of global plasma parameters. Controlled L- and H-modes are obtained by applying an external bias on th ...

2001