Thin Films on LINAC Beams as Non-Destructive Devices for Particle Beam Intenstty, Profile, Centertng and Energy Monitors

Th optical transitionradiatio emitted by electron irradiated aluminum, silver, gold-coated plates and self-supported metallic and mylar films has been investigated experimental ly using 450 incident electron beams with intensities°from 100 pA up to 10 , A, and energies from 35 up to 72 MeV. Beam d¿gnostics (intensity, profile, centering, energy) were made using an ppropriae optical rrangment together with a two-parallel foilsdevice in which the interference phenomena in transiti. on radiation emitted at both interfaces was exploited. The intensity of light integrated in a small aperture at the center of the interference pattern presents a strong particle-energy dependence(of the form. sE8) which was used in the optimization of the p~a8e adjustment of the electron bunches in the linac at small current intensities. Moreover, study of the visibility of fringes yields to an estimate of the transverse mo-mentum spread of the electron beam and to he r. m. s. angle of multiple scattering in a given mteial.