ON USING THE COHERENT FAR IR RADIATION PRODUCED BY A CHARGED-PARTICLEBUNCH TO DETERMINE ITS SHAPE .2. MEASUREMENT WITH SYNCHROTRON AND TRANSITION RADIATION

The coherent radiation spectrum from mm long relativistic electron bun ches 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 b y utilizing the Kramers-Kronig analysis technique described previously . Both synchrotron and transition radiation have been used successfull y to determine the bunch shape. We further demonstrate how the influen ce of the LINAC tuning on bunch width and bunch asymmetry can be deter mined by using this technique.