Diagnostics development for high current electron accelerators at CESTA

Some applications of induction accelerators require high quality electron beams and among them we are mainly interested in free electron laser (FEL) experiments and the achievement of the AIRIX high performance Radiographic Hydrotest Facility. In both cases small emittance and energy spread are needed to fulfil the experimental requirements. Beam diagnostics have been developed in order to allow a better knowledge of the main parameters and hence to optimize it. Since pulsed accelerators, and namely induction linacs, have essentially time dependant characteristics, it is necessary for most of the diagnostics to be time resolved. We describe the emittance measurement which uses the Cerenkov radiation from a thin window on a gated camera to record and process the image of a pepper-pot. A new electron magnetic spectrometer is presented which includes high energy resolution optical fibers and streak camera recording. Other diagnostics are discussed such as beam position measurements