Light source based on a 100mm-long monolithic undulator magnet with a very short 4mm-period length

Shigeru Yamamoto, Shigeru Kashiwagi, Shinichi Masuda, Nobuhiko Nakanii, Tomonao Hosokai, Masaki Kando, Toshiya Muto, Ken Ichi Nanbu, Fujio Hinode, Hiroyuki Hama

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


A novel method to fabricate undulator magnets of a-few-millimetre-period length is being explored. Plate-type magnets, 100mm-long with 4mm-period length, have been successfully fabricated. They produce an undulator field of approximately 3kG at a gap of 1.6mm. Prototype undulators based on this technology have been constructed. Field measurements and characterization show that the quality of the undulator field of these plate magnets is sufficient for an undulator light source, and the calculated spectrum shows that the fundamental radiation emitted from this field is quite satisfactory. Test experiments for light generation using a real electron beam have been carried out at a test accelerator at the Research Center for Electron Photon Science (ELPH), Tohoku University, Japan, which is able to realize optics conditions to accept a very short gap of ∼1.6mm. First observation and characterization of blue light was successfully accomplished.

Original languageEnglish
Pages (from-to)1902-1910
Number of pages9
JournalJournal of Synchrotron Radiation
Publication statusPublished - 2019 Nov 1


  • synchrotron light source
  • undulator
  • very short period length

ASJC Scopus subject areas

  • Radiation
  • Nuclear and High Energy Physics
  • Instrumentation


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