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The properties of the electron source define the ultimate limit of the beamquality in linear accelerators like Free Electron Lasers (FEL). The goal is todevelop an electron gun delivering beam emittance lower than current state ofthe art. Such a gun should reduce the cost and size of an X-ray Free ElectronLaser (XFEL). In this paper we present two concepts of field emitter cathodeswhich could potentially produce low emittance beam. The first challengingparameter for such cathode is to emit peak current as high as 5 A. This is theminimum current requirement for the XFEL concept from Paul Scherrer Institut.1Maximum current of 0.12 A and 0.58 A have been reached respectively with fieldemitter arrays (FEA) and single needle cathodes. Laser assisted field emissiongave encouraging results to reach even higher peak current and to pre-bunch thebeam.Comment: 23 pages, 1 table, 9 figures Accepted for publication in JVST

Nanoseconds field emitted current pulses from ZrC needles and field emitter arrays