T. LEFEVRE, J.L. RULLIER; J.T. DONOHUE
CEA/Centre d'Etudes Scientifiques et Techniques d'Aquitaine,B.P. 2, 33114 LeBarp, France; Centre d'Etudes Nucl
aires de Bordeaux-Gradignan, B.P. 120, 33175 Gradignan, France
In the latest run of the CESTA Free-Electron-Laser, a longer microwave pulse at 35 GHz has been obtained, and the bunched beam is extracted and used to excite a resonant cavity. Both optical and electronic methods have been used to characterize the bunching. In our previous experiments the presence of a strong signal at the lower FEL resonant frequency, which was not injected, led to a deterioration of the bunching at 35 GHz towards the end of the pulse. The present experiment is not strongly affected by this effect, and a comparison of our new bunching measurements with the earlier results will be presented.
