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Chasing fast dynamos and other pursuits

par Caroline CHAMPENOIS - publié le , mis à jour le

séminaire informel

lundi 9 mars 2015 à 11:00, service 322 du campus Saint-Jérôme

Cary Forest,
Université du Wisconsin à Madison

Résumé
Chasing Fast Dynamos in the Plasma Lab and Other Pursuits

Two seemingly unrelated questions in plasma astrophysics, namely the origin of astrophysical magnetic fields and the high rate of accretion observed need to explain x-ray luminosity of black holes or star formation rates in protostellar disks may now, for the first time, be addressable by laboratory experiments. Studying such conditions in the lab require hot and confined, fast flow YET unmagnetized plasmas. I will describe two plasma
experiments, one in a cylindrical Couette geometry and one in spherical Von Karman geometry that are now poised to create plasma dynamos and also observe the Magneto-rotational instability. The experiments use multi-dipole plasma buckets to contain a 20 eV plasmas that can be stirred at speeds up to 10 km/s. These conditions appear well suited for observing these processed in the lab.

Contact local : Dominique Escande

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