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Figure 1
Schematic layout of the twin helical undulator system (λu = 12 cm, Nperiod = 12 × 2) for the left and right circularly polarized lights (represented by LCP and RCP). These undulators are installed in tandem in the straight section. Five kicker magnets switch the helicity. The thick dashed lines show the electron orbit. The 0 direction corresponds to the optical axis. The unused undulator radiation is centred along the 1 direction. The angle between the two directions is defined as θk.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 5| Part 3| May 1998| Pages 542-544
https://doi.org/10.1107/S090904959701902X
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