2006•Unpublished venueRequires access
PROGRESS IN THE DESIGN OF A TWO-FREQUENCY RF CAVITY FOR AN ULTRA-LOW EMITTANCE PRE-ACCELERATED BEAM
Jean-Yves Raguin, Romain Ganter, Eugenie C. Kirk, V. Schlott, Frederic Le Pimpec, R.J. Bakker, Ana-Magdalena Anghel, M. Paraliev, M. Dehler, C. Gough, M. Pedrozzi, S. Ivković, Kevin Li, Albin F. Wrulich, Leonid Rivkin, Simon Leemann
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Abstract
Today most of the X-rays Free-Electron Laser projects are based on state of the art RF guns, which aim at a normalized electron beam emittance close to 1 mm·mrad. In this paper we report on the progress made at PSI towards a hybrid DC + RF Low Emittance Gun (LEG) capable of producing a beam with an emittance below 0.1 mm·mrad. To reduce the intrinsic thermal emittance at the LEG cathode the electrons are extracted from nano-structured fieldemitters. A gun test facility is under construction wherein after emission the beam is accelerated up to 500 keV in a diode before being injected and accelerated in a twofrequency 1.5-cell RF cavity. The fast acceleration in the diode configuration allows to minimize the emittance dilution due to the strong space charge forces. The twofrequency RF structure is optimized to limit the emittance blow-up due to the non-linearity of the RF field.