Publications de Francis Troyon

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The paper presents the KINX code for computing linear ideal MHD growth rates and eigenvectors of axisymmetric plasmas surrounded by a vacuum layer and a conducting wall. Plasma equilibrium magnetic surfaces are assumed to be nested either in the whole plasma domain (separatrix at the plasma boundary is possible) or in the domains separated by an internal separatrix (doublet and divertor configurations). The computational domain is decomposed into subdomains with nested flux surfaces. In each subdomain finit

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 delta less than or equal to 0.55. The electron energy confinement time was found to increase with elongation, owing in part to the increase of plasma current with elongation. The beneficial effect of negative triangularities was most effective at low power and tended to decrease at the higher powers used. The l

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 (beta(tor)aB/l(p)) up to 2 and line average densities up to 2.2 x 10(20) m(-3), corresponding to the Greenwald limit, have been obtained in diverted ELM-free H-modes. Quasi-stationary H-modes lasting for the entire current flat top (1.5 s) have been obtained in the presence of regular ELMs. The occurrence and magnitude of E

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 2.58, triangularities delta(a) from -0.7 to 1 as well as discharges with nearly rectangular cross sections. Plasma currents of 1 MA have been obtained in elongated discharges (kappa(a) approximate to 2.3). Ohmic discharges with delta(a) < 0 have smaller sawteeth and higher levels of MHD mode activity than plasmas wi

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, I-p less than or equal to 800kA, kappa less than or equal to 2.05, -0.7 less than or equal to delta less than or equal to 1. A new shape control algorithm, based on a finite element reconstruction of the plasma current in real time, has been implemented. Vertical growth rates up to 1000 s(-1) have been stabilized

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 sustained for the entire gyrotron pulse duration of 2 s. Careful distribution across the plasma miner radius of the power deposited from three 0.5-MW gyrotrons was essential for reaching steady-state conditions. With central current drive, up to 153 kA of current have been fully replaced transiently for 100 ms. The no

A next step device which can demonstrate long burn with a high probability of success is possible, without speculating on the accumulation of favorable effects and ignoring the other ones. From the data base available today this appears possible only with large devices such as NET, ITER or JIT. If such a device is to provide the needed database to go to DEMO it must be able to explore a sufficiently wide range of parameters. From our present knowledge this can be obtained by choosing a conservative value of

Francis Troyon

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The KINX ideal MHD stability code for axisymmetric plasmas with separatrix

Energy confinement and MHD activity in shaped TCV plasmas with localized electron cyclotron heating

Ohmic H-modes in the TCV tokamak

Effect of plasma shape on confinement and MHD behaviour in TCV

Recent Results from the Tcv Tokamak

Steady-state fully noninductive current driven by electron cyclotron waves in a magnetically confined plasma

The Physics of an Ignited Tokamak

External kink mode stability of tokamaks with finite edge current density in plasma outside separatrix

b limits in H-mode like discharges

Instabilities in a travelling periodic bumpy theta pinch

Mhd Spectrum of Reversed Field Pinch Configurations

Alfvén wave heating in toroidal plasmas

Numerical computation of the MHD spectrum of non-circular, small aspect ratio tokamaks

Axisymmetric toroidal equilibrium with flow and anisotropic pressure

Vers la fusion thermonucléaire contrôlée

Beta limit in racetrack-shaped tokamaks

Mhd-Limits to Plasma-Confinement

Numerical study of ballooning stability for quasi-divertor tokamak equilibria

Ideal MHD beta limit for INTOR

Magnetohydrodynamic Stability Calculations