![](https://sandbox4-www.anl.gov/sites/www/files/styles/article_teaser_16x9/public/awa_dielectric_03_0.jpg?itok=3Ntqn7dO)
Work at the AWA facility includes the generation of a flexible, gigawatt-scale drive bunch train and the associated diagnostics in the space-charge dominated régime; temporal electron bunch shaping and ring-beam generation both required for high transformer ratio; and emittance preservation issues such as beam break-up control of the drive beam in wakefield structures.