Electro-optic measurement of the wake fields of a relativistic electron beam

When a relativistic electron bunch traverses a structure, strong electromagnetic fields are induced in its wake. For a 12 nC bunch of duration 4.2 ps FWHM, the peak field is measured >0.5 MV/m. Time resolution of approximately 5 ps is achieved using electro-optic sampling with a lithium tantalate...

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Bibliographic Details
Published in:Physical review letters 2001-07, Vol.87 (3), p.034801-034801, Article 034801
Main Authors: Fitch, M J, Melissinos, A C, Colestock, P L, Carneiro, J P, Edwards, H T, Hartung, W H
Format: Article
Language:English
Subjects:
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
ELECTROMAGNETIC FIELDS
ELECTRON BEAMS
ELECTRONS
IMPEDANCE
LASERS
LITHIUM
SAMPLING
TANTALATES
TIME RESOLUTION
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Summary:When a relativistic electron bunch traverses a structure, strong electromagnetic fields are induced in its wake. For a 12 nC bunch of duration 4.2 ps FWHM, the peak field is measured >0.5 MV/m. Time resolution of approximately 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 for both the longitudinal and radial components of the field and relate them to the wall impedance.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.87.034801