S. Sasaki et al., DESIGN OF A NEW-TYPE OF PLANAR UNDULATOR FOR GENERATING VARIABLY POLARIZED RADIATION, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 331(1-3), 1993, pp. 763-767
A small prototype model of a new undulator is under construction for g
enerating variably polarized radiation. This undulator consists of two
pairs of planar permanent magnet arrays above and below the electron
orbit plane in a storage ring. This device has no magnetic structures
in the horizontal orbit plane in order to avoid the conflict with the
aperture of the electron orbit. The on-axis magnetic field generated b
y shifting the relative position of pairs of magnet arrays in this dev
ice induces helical and sinusoidal electron orbit motions. It leads to
the generation of circularly and linearly polarized undulator radiati
on. This new undulator will be installed in the JAERI storage ring (JS
R) in order to examine the performance for generating variable polariz
ation.