Proton radiography of magnetic field in laser produced plasmaS. le Pape, P. Patel, S. Chen, R. Town and A. Mackinnon
Lawrence Livermore National Laboratory, 7000 East Avenue Livermore, California, USA
Electromagnetic fields generated by the interaction with plasmas of long-pulse laser beams relevant to inertial confinement fusion have been measure. A proton beam generated by the interaction of an ultraintense laser with a thin metallic foil is used to probe the B-fields. The proton beam then generated is temporally short (of the order of a ps), highly laminar and hence equivalent to a virtual point which makes it an ideal source for radiography. We have investigated, using face-on radiography, B fields at intensity around 1014 W/cm2 due to the non colinearity of temperature and density gradients.
© EDP Sciences, Springer-Verlag 2009