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Quantum theory of a free electron in a tapered wiggler field
Authors:Selcuk Saritepe  NVVJ Swamy
Institution:Department of Physics, Oklahoma State University, Stillwater, OK 74078, USA
Abstract:It is pointed out that a slight modification of the relativistic quantum theory of a free electron in a uniform wiggler field enables the study of motion in a tapered wiggler field of the form kw1 = kw ? bz which merits attention. The lower limit of z is 800 cm. The exact relativistic quantum mechanical calculation shows an enhancement in the gain for single pass. The frequencies are up-shifted by amounts depending on the parameter b.
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