Eur. Phys. J. Special Topics 175, 61-64 (2009)
https://doi.org/10.1140/epjst/e2009-01118-3

Proton radiography of magnetic field in laser produced plasma

Lawrence Livermore National Laboratory, 7000, East Avenue Livermore, California, USA

Abstract

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.