Fig. 10-5(a) A new planar polarized undulator

Fig. 10-5(b) The schematic drawing of the magnetic structure A new planar undulator has been developed to generate variously-polarized synchrotron radiation.

Fig. 10-6 Synchrotron radiation pattern observed following the installation of the undulator in the small electron storage ring JSR. Using this undulator, it has been easy to generate polarized radiation beams, such as circularly-, and linearly-polarized beams.

An undulator is an insertion device installed in an electron storage ring used to generate high-brillance photon beams. It is one of the most important components of a third-generation synchrotron radiation facility, such as SPring-8. The new planar undulator has been developed to generate variously-polarized synchrotron radiation. This undulator consists of two pairs of planar permanent magnet arrays above and below the plane (see Fig. 10-5(a), Fig. 10-5(b)). The undulator is able to generate circularly- and linearly-polarized radiation beams by shiftingthe relative position of arrays (). This undulator was installed in the small electron storage ring JSR at JAERI. With it, circularly- and linearly- polarized beams have been observed (see Fig. 10-6).

Reference S. Sasaki et al., A new undulator for generating variably polarized radiations, Jpn. J. Appl. Phys. 31 L1794 (1992).

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