  We present the anticipated performances of a multi-cell RF injector operated
either with a thermoionic cathode or with a gated photo-cathode. By means of a
magnetic compression and a Coherent Spontaneous Emission seeded FEL radiating
at 100 to 200 mm, the system produces a beam fully bunched with a 200 A peak
current at 2 mm.mrad rms emittance. The electron bunch is a few FEL buckets
long and phase-locked to the RF so to make this device an ideal injector for
second generation plasma acceleration experiments.
