P. Hennequin

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We study probability distributions of several characteristic parameters on various forms of Quicksort algorithm: median-of-k, cutting of small lists. A constant use of generating functions leads to a more synthetic description and analysis of the combinatorial structure of the algorithm. This approach allows us in particular to extend the known results for(More)
Quasistationary operation has been achieved on the Joint European Torus tokamak in internal-transport-barrier (ITB) scenarios, with the discharge time limited only by plant constraints. Full current drive was obtained over all the high performance phase by using lower hybrid current drive. For the first time feedback control on the total pressure and on the(More)
Turbulence measurements in TORE SUPRA tokamak plasmas have been quantitatively compared to predictions by nonlinear gyrokinetic simulations. For the first time, numerical results simultaneously match within experimental uncertainty (a) the magnitude of effective heat diffusivity, (b) rms values of density fluctuations, and (c) wave-number spectra in both(More)
A simple model for the evolution of turbulence fluctuation spectra, which includes neighboring interactions leading to the usual dual cascade as well as disparate scale interactions corresponding to refraction by large scale structures, is derived. The model recovers the usual Kraichnan-Kolmogorov picture in the case of exclusively local interactions and(More)
The theoretical investigation of edge and SOL plasma turbulence indicates that the turbulence appears far less intermittent when the appropriate Log(N) field is used. Diffusive flow transport shows that the SOL parallel flow spreads into the core but exhibits a weak dependence on the Schmidt number. Conversely core flows strongly shifts the SOL stagnation(More)
QuaLiKiz, a model based on a local gyrokinetic eigenvalue solver[1] is expanded to include momentum flux modeling in addition to heat and particle fluxes[2, 3]. Essential for accurate momentum flux predictions, the parallel asymmetrization of the eigenfunctions is successfully recovered by an analytical fluid model. This is tested against self-consistent(More)
The TCV tokamak is augmenting its unique historical capabilities (strong shaping, strong electron heating) with ion heating, additional electron heating compatible with high densities, and variable divertor geometry, in a multifaceted upgrade program designed to broaden its operational range without sacrificing its fundamental flexibility. The TCV program(More)
Turbulence in hot magnetized plasmas is shown to generate permeable localized transport barriers that globally organize into the so-called "ExB staircase" [G. Dif-Pradalier et al., Phys. Rev. E, 82, 025401(R) (2010)]. Its domain of existence and dependence with key plasma parameters is discussed theoretically. Based on these predictions, staircases are(More)