M.J. Fitch, A.C. Melissinos (University of Rochester), P.L. Colestock*, J.-P. Carneiro, H.T. Edwards, W.H. Hartung (Fermi National Accelerator Laboratory)
When a relativistic electron bunch traverses a structure, strong electric fields are induced in its wake. We present measurements of the electric field as a function of time as measured at a fixed location in the beam line. For a 12 nC bunch of duration 4.2 ps FWHM, the peak field is measured >0.5 MV/m. Time resolution of ~5 ps is achieved using electro-optic sampling with a lithium tantalate crystal and a short-pulse infrared laser synchronized to the beam. We present measurements under several different experimental conditions and discuss the influence of mode excitation in the structure.
*Present Address: Los Alamos National Laboratory
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