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Accueil > A propos du LPP > Communication > Actualités archivées > 2017 > First experiments on LMJ/PETAL+ : study of magnetic reconnection

First experiments on LMJ/PETAL+ : study of magnetic reconnection

The first experiments on the Laser Mega Joule scheduled for Institut Laser Plasma will start in 2017. Among 3, one of them is a collaboration between LPP and LULI, and aims at studying magnetic reconnection. For that purpose, 2 laser beams (12 KJ, 5 ns) will impact in a normal way a gold solid target of thickness 50 micrometers. By Biermann-Battery effect, two magnetic field loops will be created around each beam, parallel to the targets. Hydrorad simulations predict an associated magnetic fields of 800 T. These loops being anti-parallel, they will be able to reconnect. Most of the experimental studies on magnetic reconnection are based on data analysis, coming from satelite measurements (Cluster, MMS). This original experiment will allow to provide different measures.

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Roch Smets

By interaction of a laser beam (300 J, 0.7 ps) on a secondary gold target of thickness 5 micrometers, a monokinetic beam of protons around 15 MeV is created by Target Neutral Sheet Acceleration. These protons will be deviated in their motion by the electric and magnetic fields in the neighborhood of the reconnection region, and will irradiate a radiochromic films cassette. The analyse of the collected structures will allow to gain informations on the magnetic fields, and more specifically on the Hall component that controls the reconnection rate, (ie its efficiency). Moreover, an image spectrometer (DP1) will allow to collect 12 pictures intagrated on 130 ps, giving informations on the evolution of the plasma temperature, depending on space and time. This should allow to identify the part of magnetic energy that is converted in thermal energy, and in bulk energy.


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