  Accelerating structures operating in Ka-Band are foreseen to achieve
gradients around 150 MV/m. Among possible applications of a Ka-Band
accelerating structure we refer to the beam phase-space manipulation for the
Compact Light XLS project as well as medical and industrial applications. In
this paper, a Ka-Band Klystron amplifier is being investigated in order to feed
Ka-Band accelerating structures. The initial design is presented including the
high-power DC gun and the beam focusing channel.
