Abstract

A new undulator for generating variably-polarized radiation was proposed in an earlier paper. This device consists of two pairs of planar permanent magnet rows above and below the electron orbit plane. The magnetic field generated with this undulator, stronger than any other existing planar helical device, induces various types of electron motion such as vertically or horizontally sinusoidal motion and helical motion. The analyses of magnetic field and undulator radiation spectra are made on this undulator. For calculating the spectra and angular distributions in various modes, the SPring-8 storage ring parameters are assumed. This undulator generates brilliant circularly-polarized undulator radiation comparable in intensity with linearly-polarized radiation from a conventional undulator.

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