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Figure 1
The basic concept for a variable-period undulator. The spaces with width α permit period variation along the z axis, and the blocks of high-permeability material (1010 steel or vanadium permendur) have a fixed width d. The periodic transverse undulator field is derived by the staggered arrays from the longitudinal field, B0, produced by the electromagnetic (or a superconducting) solenoid.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 10| Part 3| April 2003| Pages 205-213
doi:10.1107/S0909049502023257
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