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A novel method of producing intense short wavelength radiation fromrelativistic electrons is described. The electrons are periodically bunched atthe wavelength of interest enabling in-phase super-radiant emission that isorders of magnitude more intense than that of unbunched electrons. The periodicbunching is achieved in steps beginning with an array of beamlets emitted froma nanoengineered field emission array. The beamlets are then manipulated andconverted to a longitudinal density modulation via a transverse to longitudinalemittance exchange. Periodic bunching at short wavelength is shown to bepossible, and the partially coherent x-ray properties produced by InverseCompton scattering from an intense laser are estimated for an example at 13 nmwavelength using a 1.5 MeV electron beam.

Intense Super-radiant X-rays from a Compact Source using a Nanocathode Array and Emittance Exchange