journée volcanique à saint Hilaire (Allier)Courtesy of Nadia Gambino - School of Physical Sciences, Dublin City University -The video describes the spatial-temporal evolution of two colliding laser produced plasmas,obtained by splitting the laser beam in two parts and focused onto a solid Al target at a laser fluence of 5•10^10W/cm2, from 0 to 400nsec with a time resolution of 5nsec,and exposure time of 3nsec.The two plasmas,distant 3.05mm from each other,expand supersonic and collide after 60nsec.At this laser fluence,the interaction zone gives rise to the so-called stagnation layer,prevailing on the interpenetration of the plumes.A rapid accumulation of plasma material at the collision front leads to the formation of a dense and uniform plasma layer having a much slower dynamic compared to the single plume one. code pour embarquer la vidéo : >>> http://www.youtube.com/embed/np2gEWM18s8 <<< |