Giant Oscillations of Electron Temperature during Steady-State Operation on Tore Supra

Imbeaux, F.; Giruzzi, G.; Maget, P.; Ségui, J. L.; Udintsev, V. S.; Artaud, Jean-François; Elbeze, D.; Huysmans, G.; Joffrin, E.; Mazon, D.; Sabot, R.; Sirinelli, A.

doi:10.1103/physrevlett.96.045004

Cited by 23 publications

(19 citation statements)

References 10 publications

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“…The LH-phase could therefore be used as an actuator in future feedback control experiments trying to stabilise these temperature oscillations. However, the LHcurrent deposition is in general relatively broad as previously shown in figure 4 and in similar experiments studying the oscillation experimentally [23]. Therefore, the ECCD also appears as an attractive tool for the control of the O-regime.…”

Section: Interaction Between Current Density and Temperature Bifurcationsupporting

confidence: 60%

Integrated plasma controls for steady state scenarios

Joffrin¹,

Barana²,

Mazon³

et al. 2007

Nucl. Fusion

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In recent campaigns, Tore Supra has focused its efforts on the physics optimisation and operation of stationary scenarios with high input power (up to 8 MW), duration of more than 60 s and vanishing loop voltage (up to 80% of non-inductive current). For physics integration, Tore Supra has been equipped with a large number of new real time sensors. The control of the lower hybrid (LH) wave deposition profile width measured by the hard x-ray camera has been achieved with the parallel refractive index n‖ varying from 1.7 to 2.3 and the LH-wave power using different types of control techniques. In addition, the control of the current profile with the parallel refractive index of the LH-launched spectrum has also been combined with loop voltage control using the central solenoid voltage as actuator. The effect of electron cyclotron heating as an actuator has been examined for control of temperature bifurcation phenomena such as internal transport barrier. On the basis of the experimental power flux analyses, the seven infrared cameras monitoring the five antennas and the toroidal pumped limiter have been used for implementing new power load limit avoidance control schemes which have been successfully combined with the LH-deposition profile and loop voltage control.

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Section: Interaction Between Current Density and Temperature Bifurcationsupporting

confidence: 60%

Integrated plasma controls for steady state scenarios

Joffrin¹,

Barana²,

Mazon³

et al. 2007

Nucl. Fusion

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“…This mode gives also access to the interpretative diffusion coefficients (heat, particle, etc), provided the related sources are being calculated by the code (see e.g. analysis of the electron heat diffusivity during giant oscillations [77]).…”

Section: Current Diffusion and Data Validationmentioning

confidence: 99%

The CRONOS suite of codes for integrated tokamak modelling

et al. 2010

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CRONOS is a suite of numerical codes for the predictive/interpretative simulation of a full tokamak discharge. It integrates, in a modular structure, a 1D transport solver with general 2D magnetic equilibria, several heat, particle and impurities transport models, as well as heat, particle and momentum sources. This paper gives a first comprehensive description of the CRONOS suite: overall structure of the code, main available models, details on the simulation workflow and numerical implementation. Some examples of applications to the analysis of experimental discharges and the predictions of ITER scenarios are also given.

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“…current, temperature profiles in the direction perpendicular to the magnetic surfaces) address more subtle physical aspects and have to cope with the many nonlinear interactions between plasma physical quantities (see e.g. [1][2][3]). In particular, there is a key requirement for the sustainment of enhanced confinement in advanced scenarios, which is a proper alignment of current and pressure profile [4].…”

Section: Introductionmentioning

confidence: 99%

Real-time control of the safety factor profile diagnosed by magneto-hydrodynamic activity on the Tore Supra tokamak

Imbeaux¹,

Lennholm²,

Pastor³

et al. 2011

Nucl. Fusion

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Real-time control is essential for many aspects of tokamak operation. A key parameter to control is the current profile, since both confinement properties and magneto-hydrodynamic (MHD) activity depend on it in quite a sensitive way. The long pulse capability of the Tore Supra tokamak has allowed a unique type of experiment, where successive stationary states of the safety factor profile, defined by their MHD activity, are established and controlled in real time. Multiple target stationary states could be requested and reached during the main heating phase of a single plasma discharge. Experiments have been carried out featuring (i) control of the presence/absence of sawteeth with varying plasma parameters, (ii) obtaining and sustaining a ‘hot core’ plasma regime without MHD activity and (iii) recovery from a voluntarily triggered deleterious MHD regime. During these experiments, the influence of fast ions on MHD stability could be observed and characterized, as well as indications of an enhanced ‘hot core’ confinement in electron heat transport during quiescent MHD states.

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Giant Oscillations of Electron Temperature during Steady-State Operation on Tore Supra

Cited by 23 publications

References 10 publications

Integrated plasma controls for steady state scenarios

Integrated plasma controls for steady state scenarios

The CRONOS suite of codes for integrated tokamak modelling

Real-time control of the safety factor profile diagnosed by magneto-hydrodynamic activity on the Tore Supra tokamak

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