{"id":48462,"date":"2014-04-30T14:52:59","date_gmt":"2014-04-30T14:52:59","guid":{"rendered":"http:\/\/www.rochester.edu\/newscenter\/?p=48462"},"modified":"2020-04-13T17:33:31","modified_gmt":"2020-04-13T21:33:31","slug":"experiment-on-earth-demonstrates-effect-observed-in-space-2","status":"publish","type":"post","link":"https:\/\/www.rochester.edu\/newscenter\/experiment-on-earth-demonstrates-effect-observed-in-space-2\/","title":{"rendered":"Experiment on earth demonstrates effect observed in space"},"content":{"rendered":"

International collaboration uses plasma flows in a laboratory to understand how beam-like jets may form in space<\/em><\/strong><\/p>\n

Streaming jets of high-speed matter produce some of the most stunning objects seen in space. Astronomers have seen them shooting out of young stars just being formed, X-ray binary stars and even the supermassive black holes at the centers of large galaxies.<\/p>\n

Theoretical explanations for what causes those beam-like jets have been around for years, but now an experiment by French and American researchers using extremely high-powered lasers offers experimental verification of one proposed mechanism for creating them.<\/p>\n

\u201cThis research is an example of how laboratory experiments can be used to test mechanisms that may produce what we observe in space,” said Eric Blackman, professor of physics and astronomy at the URochester and one of the co-authors. Blackman explains that he and his collaborators wanted to recreate conditions in the lab that lead to jets in space becoming collimated \u2013 or beam-like \u2013 rather than diverging. Theory and computational simulations had suggested the possibility that jets might be created by \u201cshock focused inertial confinement.\u201d Blackman adds that the experiment \u201cconfirms that this particular mechanism is viable, even though other effects are likely to also be taking place.\u201d<\/p>\n

In their results, the researchers show evidence of the “shocks” predicted by theory, and which give the mechanism its name. These shocks are surfaces in space where there is a sudden change in the density, speed, and direction of a flow. According to theory, which is consistent with the new experiment, they are what cause the beam-like nature of the jets to form.<\/p>\n

In the paper published in Physical Review Letters,<\/em> and highlighted as an editor\u2019s suggestion, the researchers explain how they used the laser laboratory facility, LULI, at the Ecole Polytechnique in France, to recreate these space jets. Collaborators at the University of Chicago supplied a sophisticated computer code FLASH that they developed and adapted to help analyze the results.<\/p>\n

\u201cWe have focused a very energetic laser beam on a tiny iron target \u2013 a little thinner than a human hair,\u201d explains Alessandra Ravasio, who led the experiment. \u201cIn this way we can create a supersonic plasma flow.\u201d<\/p>\n

With nothing to prevent the resulting iron plasma from spreading out, it would flow quasi-spherically from the target. In order to see the effects of a surrounding wind, the researchers generated another lighter, supersonic plasma from a plastic ring surrounding the central target.<\/p>\n

\u201cThe novelty of this experiment is in the way we spatially distribute the laser energy, with a central dot generating the iron flow and a outer ring incident on the plastic,\u201d adds Ravasio. \u201cIn this way we could create a nested geometry and study the interaction between the two flows.\u201d<\/p>\n

The researchers found that the interaction of the two plasmas sharply collimates the iron plasma flow. That is, rather than spreading out in all directions, the iron flow emanates primarily along a single direction. The experimental datashowed that a shock wave is generated in this interaction, which helps the momentum and inertia of the plastic outer wind to collimate the inner iron flow into a jet.<\/p>\n

\"Experimental<\/a>
X-ray radiographs of the experiment that show the density and the collimation of the experiment at 4, 8 and 20 nanosecond after the laser hits the target. (Credit: Yurchak et al, Phys. Rev. Lett. 112, 155001)<\/figcaption><\/figure>\n

The experiment is an example of laboratory astrophysics, a rapidly growing area of high energy density physics that\u00a0requires the\u00a0\u00a0collaboration of astrophysicists, experimental plasma physicistsand computational physicists. It is a field in which researchers at the URochester and at the Ecole Polytechnique are involved on multiple fronts.<\/p>\n

The team of collaborators also included R. Yurchak, A. Pelka, T. Vinci, M. Koenig, and A. Benuzzi-Mounaix from the Ecole Polytechnique, France; S. Pikuz from the Joint Institute for High Temperature RAS in Moscow, Russia; E. Falize and B. Loupias from CEA-DAM-DIF, France; and M. Fatenajad, P. Tzeferacos and D. Q. Lamb from the University of Chicago.<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

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