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Figure 1
Summary of the development of the reduction of period length of undulators over the years at the Photon Factory (PF), KEK. Red lines indicate the history at the 2.5 GeV PF, and blue lines indicate the history at the 6.5 GeV PF-Accumulation Ring (PF-AR). Out-of-vac and In-vac mean the out-of-vacuum and in-vacuum undulators, respectively. The green line indicates the target of the present research of a-few-millimetre-period undulators.

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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