Abstract

This paper discusses some aspect of the experimental effort in high field science (up to 10<sup>22</sup> W/cm<sup>2</sup>) done with the high peak power (&gt;200TW) laser system at the Advanced Laser Light Source facility (ALLS). A maximum intensity of 10<sup>22</sup> W/cm<sup>2</sup> has been achieved on target. The present experiments explore the acceleration of electrons directly by the laser field (DLFA) in the transition between the relativistic and ultra-relatisitic regimes. Electrons are accelerated to multi-MeV energies using radially (TM<sub>01</sub>) and azimuthally (TE<sub>01</sub>) polarized modes and the contribution of various acceleration processes is briefly discussed.

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