Physics
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21621402s&link_type=abstract
American Astronomical Society, AAS Meeting #216, #214.02; Bulletin of the American Astronomical Society, Vol. 41, p.869
Physics
Scientific paper
Intense particle and laser beams can now deliver intensities in excess of 1022 W/cm2 capable of generating relativistic plasma flows, and plasmas with relativistic temperatures in laboratory conditions. In many astrophysical scenarios, namely in connection with collisionless shocks, the microphysics is dominated by plasma mechanisms. The possibility to explore in the laboratory the onset, the formation, and the structure of the collisionless shocks and to explore particle acceleration in these settings opens exciting prospects, which combined with recent progresses on large scale particle-in-cell simulations of shocks, can lead to new insights on the physics of collisionless shocks.
Using as a starting point recent multi-dimensional ab initio numerical simulations of relativistic shocks, I will explore the possibility to reproduce in the laboratory some of the relevant underlying shock physics. It will be shown that the microphysics of the current filamentation and magnetic field generation, determining the formation of relativistic shocks in unmagnetized plasmas, can be studied with the propagation of electron-positron relativistic beams or fireball beams, soon to be available for experiments, in a plasma. Moreover, ultra intense lasers can also generate collisionless shocks; depending on the laser intensity, laser energy and target density the formation and the structure of the shocks is significantly different ranging from electrostatic shocks to Weibel-mediated shocks. Signatures for the different scenarios are identified, and the possibility to explore particle acceleration in shocks will also be discussed and illustrated by numerical simulations, in close connection with experiments now being planned. Recent experimental results on collisionless shocks in the laboratory will also be reviewed.
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