On using the coherent far IR radiation produced by a charged particle bunch to determine its shape — II Measurement with synchrotron and transition radiation

The coherent radiation spectrum from mm long relativistic electron bunches perturbed in different ways is investigated with a large aperture Michelson spectrometer. From these data we are able to determine the structure and asymmetric shape of the longitudinal electron density of short relativistic electron bunches on a submillimeter length scale by utilizing the Kramers-Kronig analysis technique described previously. Both synchrotron and transition radiation have been used successfully to determine the bunch shape. We further demonstrate how the influence of the LINAC tuning on bunch width and bunch asymmetry can be determined by using this technique.