Electro-Optic Sampling of Transient Fields from the passage of High-Charge Electron Bunches
M. J. Fitch, A. C. Melissinos, P. L. Colestock, J. -P. Carneiro, H. T. Edwards, W. H. Hartung
Abstract
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 (LiTaO3) 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.
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