Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21641012m&link_type=abstract
American Astronomical Society, AAS Meeting #216, #410.12; Bulletin of the American Astronomical Society, Vol. 41, p.819
Astronomy and Astrophysics
Astrophysics
Scientific paper
High Mach number shocks in astrophysical plasmas are believed to be responsible for cosmic-ray (CR) acceleration over a wide range of energies. CR radiation is a result of particle acceleration mediated by the long ranging and temporally sustained magnetic fields associated with these shocks. Since the magneto-hydrodynamic equations are scale invariant, astronomical systems may be simulated in laboratory experiments where megaparsecs and gigayears are studied in centimetres and microseconds. Here we present data on magnetic field amplification collected in an experiment conducted on the Nd:glass Phoenix laser system at UCLA. In this study, a plastic foil is exploded to produce a shock which is allowed to expand into sub-atmosphere density helium gas. Magnetic fields are measured in several positions and at a range of densities. The shock strength may be varied by modifying the energy and intensity of the laser incident on the foil target. Diagnosis of the magnetic fields combined with computer simulations give insight into generation mechanisms. The relevance of these results to previous theoretical and simulation work will be highlighted.
Bell Roger A.
Bingham Richard
Constantin Costel
Edwards Margo
Everson E.
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