Magnetic field measurements in laser-produced plasmas via proton deflectometry

Cecchetti, C. A.; Borghesi, M.; Fuchs, J.; Schurtz, G.; Kar, S.; Macchi, A.; Romagnani, L.; Wilson, P. A.; Antici, P.; Jung, R.; Osterholtz, J.; Pipahl, C. A.; Willi, O.; Schiavi, A.; Notley, M.; Neely, D.
April 2009
Physics of Plasmas;Apr2009, Vol. 16 Issue 4, p043102
Academic Journal
Large magnetic fields generated during laser-matter interaction at irradiances of ∼5×1014 W cm-2 have been measured using a deflectometry technique employing MeV laser-accelerated protons. Azimuthal magnetic fields were identified unambiguously via a characteristic proton deflection pattern and found to have an amplitude of ∼45 T in the outer coronal region. Comparison with magnetohydrodynamic simulations confirms that in this regime the ∇vector Te×∇vector ne source is the main field generation mechanism, while additional terms are negligible.


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