  A novel method of producing intense short wavelength radiation from
relativistic electrons is described. The electrons are periodically bunched at
the wavelength of interest enabling in-phase super-radiant emission that is
orders of magnitude more intense than that of unbunched electrons. The periodic
bunching is achieved in steps beginning with an array of beamlets emitted from
a nanoengineered field emission array. The beamlets are then manipulated and
converted to a longitudinal density modulation via a transverse to longitudinal
emittance exchange. Periodic bunching at short wavelength is shown to be
possible, and the partially coherent x-ray properties produced by Inverse
Compton scattering from an intense laser are estimated for an example at 13 nm
wavelength using a 1.5 MeV electron beam.
