Phys. Rev. ST Accel. Beams 7, 020702 (2004) [5 pages]Optimization of asymmetric figure-8 undulator as circularly polarized light source
Katsutoshi Shirasawa * and Atsunari Hiraya
Takashi Tanaka and Hideo Kitamura Received 1 December 2003; published 27 February 2004 In the soft x-ray region, the demand for helicity switching of circularly polarized undulator radiation is increasing to study circular dichroism. The asymmetric figure-8 undulator is an insertion device to provide circularly polarized radiation (CPR) and a simple method of helicity switching which has been proposed and built at SPring-8. Because of its complicated magnetic structure, it is important to optimize the magnetic parameters for more effective utilization of CPR. Using an analytical method, the relation between the magnetic parameters to maximize the degree of circular polarization is obtained. The impact of the finite emittance of electron beams on the polarization performance is also investigated numerically. ©2004 The American Physical Society
URL: http://link.aps.org/doi/10.1103/PhysRevSTAB.7.020702 * Electronic address: kshira@spring8.or.jp [ Abstract | Previous article | Next article | Issue 2 ] |
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