RESONANCE EFFECTS OF TRANSITION RADIATION EMITTED FROM THIN FOIL STACKS USING ELECTRON-BEAM

Transition radiation (TR) X-rays are expected to be a highly brilliant X-ray source because the interference among TR X-rays emitted from ma ny thin foils placed periodically in vacuum can increase their intensi ty and make them quasi-monochromatic. In order to study the interferen ce (resonance) effects of TR, we measured the energy spectra of TR,for several sets of thin foil stacks at various emission angles. It was f ound that the resonance effects of TR are classified into intrafoil an d interfoil resonances and the intensity of TR X-rays increases nonlin early with increasing foil number, attributed to the interfoil resonan ce. It became evident that the brilliance of TR is as high as that of SR. (C) 1997 Elsevier Science Ltd.