CHARGED PARTICLE BEAM DIVERGENCE MEASUREMENTS USING TRANSITION RADIATION

We have developed single and double foil techniques to measure current density, energy, and divergence of intense relativistic charged particle beams from the transition radiation produced at a foil-vacuum interface. Single foil optical transition radiation (OTR) measurements have been made using a high intensity beam of lo-25 MeV electrons from the EG&G/EM linac, in which the entire OTR distribution is captured with an imaging system.' Here we describe the results of similar experiments utilizing a twofoil interferometer, which has potential for making high precision energy and emittance measurements of very cold beams.