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SÉMINAIRE DU LERMA
OBSERVATOIRE DE PARIS
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Mercredi 1 juin 2011 à 14H


77 avenue Denfert Rochereau, Paris 14



Salle de l'Atelier, Observatoire de Paris





High Energy Density Plasmas: X-ray Sources and Plasma Jets



David HAMMER

Cornell University



Résumé : The Cornell University Laboratory of Plasma Studies makes use of 1 trillion watt, 1 million ampere pulsed power generators for fundamental studies and applications of high energy density plasmas in several configurations. Some are as high density and temperature as $10^{22}/cm^3$ and 1.5 keV, respectively, with very short life, $<<$ 1 ns. Others last as long as a few hundred nanoseconds at somewhat lower density and temperature and take the form of plasma jets that can interact with other plasmas. These have been used for studies of the interaction of plasma jets with a cross wind in a configuration with dimensionless parameters that are of interest to the astrophysics community. The very short-lived, hot plasma is an extremely bright x-ray source that has been used for x-ray absorption spectroscopy in high energy density plasmas and could be used to determine the radiation transfer properties of materials that make up such astrophysical objects as supernova remnants.