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Figure 4
(a) Undulator field of the pair of 100 mm-long PMMs (numbered FS16 and FS19) with a period length of 4 mm measured at gaps of 1.4, 1.6, 2.0 and 2.6 mm. (b) Calculated orbit of an electron with 2.5 GeV energy in the undulator field at the same gaps. (c) Amplitude of the magnetic field as a function of the magnet gap (solid circles). The calculated gap–field relation is also shown. The solid curve represents a case with the same structure as the present PMM where two effective poles per period exist, and the dashed curve represents a case of the normal Halbach undulator where four effective poles per period exist. The calculation was made on the assumption that NEOMAX-37SH material is used and magnetization is complete.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 26| Part 6| November 2019| Pages 1902-1910
https://doi.org/10.1107/S1600577519013031
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