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We present a novel concept for the generation of gigahertz repetition ratehigh brightness electron bunches. A custom design 100 kV thermionic gunprovides a continuous electron beam, with the current determined by thefilament size and temperature. A 1 GHz rectangular RF cavity deflects the beamacross a knife-edge, creating a pulsed beam. Adding a higher harmonic mode tothis cavity results in a flattened magnetic field profile which increases theduty cycle to 30%. Finally, a compression cavity induces a negativelongitudinal velocity-time chirp in a bunch, initiating ballistic compression.Adding a higher harmonic mode to this cavity increases the linearity of thischirp and thus decreases the final bunch length. Charged particle simulationsshow that with a 0.15 mm radius LaB6 filament held at 1760 K, this method cancreate 279 fs, 3.0 pC electron bunches with a radial rms core emittance of0.089 mm mrad at a repetition rate of 1 GHz.

Gigahertz repetition rate thermionic electron gun concept