Abstract
The elliptical wiggler is a circularly polarized light source capable of providing very broad spectral coverage and a high degree of circular polarization. The main features of an elliptical wiggler can be understood through analogy to bending magnet radiation. However, some aspects, such as the end structure's influence on the degree of circular polarization, require more elaborate methods to characterize. We present an algorithm based on the stationary-phase method, which allows calculation of radiation properties from an arbitrary electron trajectory, so a non-sinusoidal magnetic field's influence on the radiation performance can be taken into account. We show general radiation properties of an elliptical wiggler and discuss factors affecting the radiation produced. Practical issues encountered during the conceptual design of an elliptical wiggler at the Advanced Light Source are addressed.
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