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Accueil > A propos du LPP > Communication > Actualités archivées > 2018 > Helmholtz International Fellow Award to Pascale Hennequin as visiting scientist at LPP

Helmholtz International Fellow Award to Pascale Hennequin as visiting scientist at LPP

Pascale Hennequin, Directeur de Recherche CNRS at Plasma Physics Laboratory, Ecole Polytechnique, is one of the five scientists honoured in December 2017 by the Helmholtz Association with the Helmholtz International Fellow Award. Pascale Hennequin is a specialist in the fields of plasma diagnostics and nonlinear plasma dynamics. She is interested both in fundamental questions related to plasma turbulence and its implications, especially on predicting confinement performances in magnetic fusion devices.
Pascale Hennequin is also the founder of the “Federation de Recherche Fusion par Confinement Magnétique”, which is the wide-ranging national program coordinating all the academic laboratories in the fusion domain in France, and she held the position of director between 2007 and 2014.
One of the fundamental properties of Turbulence is mixing. Magnetic fusion requires concentrating particles and heat at the core of the fusion device. Therefore, detailed assessment and understanding of turbulent phenomena, are critical to quantify how turbulent transport may degrade magnetic confinement. Controlling these processes calls for exact clarification of them.
For this purpose Pascale Hennequin developed non perturbative, versatile instruments using either lasers or microwaves, capable to measure turbulence intensity as well as fluctuation velocity and resolve them across a wide range of spatial wave lengths. Using these diagnostic systems she has studied the dynamics and statistical properties of plasma turbulence (such as for instance the wave number
spectrum) in various conditions in different magnetic fusion devices, under challenging conditions of large scale experiment ( including TCV in Switzerland, Tore Supra in France and, since 2013 under the auspices of a Virtual Helmholtz Institute, ASDEX Upgrade in Garching). On Tore Supra, by varying the normalized ion Larmor radius rho* while keeping other non dimensional parameters constant, she has demonstrated the invariance of the wave number spectrum, whose k-range and intensity re-scale with the ion Larmor radius, an experiment which remains unique.
This result is important to confirm a potential beneficial extrapolation towards ITER size. She has initiated the first direct comparisons of the measured wavenumber spectra to gyro-kinetic simulations in collaboration with CEA colleagues.
Since 2013, she has further investigated these topics in close collaboration with IPP colleagues on ASDEX Upgrade. Advanced capabilities were achieved by combining IPP and LPP instruments and developing new channels, making it possible to measure new properties of the turbulent eddies, such as their tilting or their asymmetry, or long range correlations appearing on top of usual shorter correlation length, which are consistent with a possible avalanche like behavior of the heat flux, an important finding for scaling to larger device sizes.

The prize endowed will fund research visits to Max Planck Institute for Plasma Physics (IPP) in Garching.

Tutelles : CNRS Ecole Polytechnique Sorbonne Université Université Paris Sud Observatoire de Paris Convention : CEA
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Hébergeur : Laboratoire de Physique des Plasmas, Ecole Polytechnique route de Saclay F-91128 PALAISEAU CEDEX
Directeur de la publication : Pascal Chabert (Directeur)