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Separating the effects of heating and current drive on NTM evolution in TCV

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Impact of heat deposition profile on global confinement of NBI heated plasmas in the LHD

Wilfred Anthony Cooper, Terunobu Akiyama, Kenji Tanaka

Energy confinement and heat transport of net-current-free NBI heated plasmas in the large helical device (LHD) are discussed with emphasis on density and power deposition profile dependences. Although the apparent density dependence of the energy confineme ...

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

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

Effects of localized electron heating and current drive on the sawtooth period

Olivier Sauter, Timothy Goodman

Localized electron heating and current drive, like those produced by electron cyclotron heating (ECH) systems, are powerful tools for controlling the sawtooth period. They allow the direct modification of the plasma parameters which determine the sawtooth ...

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

Density limits in helium plasmas at JET

Richard Pitts

Recently at JET a pure helium campaign has been performed. The exploration of the density limit in L-mode limiter as well as L-mode and H-mode diverted plasmas was one of the main objectives. In L-mode plasmas the density can be increased until the total r ...

2003

Control of neoclassical tearing modes by sawtooth control

Olivier Sauter

The onset of a neoclassical tearing mode (NTM) depends on the existence of a large enough seed island. It is shown in the Joint European Torus that NTMs can be readily destabilized by long-period sawteeth, such as obtained by sawtooth stabilization from io ...

2002

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

Marginal beta-limit for neoclassical tearing modes in JET H-mode discharges

Olivier Sauter

A neoclassical tearing mode (NTM) requires a finite size seed island to become unstable. Usually the local pressure gradient is relatively large at the beta-values needed for these seed islands to destabilize the NTMs. Therefore, the island has a large gro ...

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 ...

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