6.65 m off-plane eagle spectrograph/monochromator at the photon factory

Kenji Ito, Taizo Sasaki, Takeshi Namioka, Kiyoshi Ueda, Yumio Morioka

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


A description is given of the design principle and the performance of a 6.65 m vertical dispersion off-plane Eagle spectrograph/monochromator (6VOPE) constructed at the Photon Factory. 6VOPE has a unique predisperser system of zero dispersion type that effectively separates the overlapping orders by a simple rotation of the fore-gratings and adjustment of the intermediate slit width. The performance of 6VOPE was examined from the viewpoint of resolution by taking absorption spectra of rare gases in the 50-90 nm region with the 6th to 10th orders. The resolving power was estimated from the separation between two closely lying lines of Ar I at ∼ 79 nm to be ≳ 2.5 × 105, the highest resolving power ever reported for this wavelength region.

Original languageEnglish
Pages (from-to)290-293
Number of pages4
JournalNuclear Inst. and Methods in Physics Research, A
Issue number1-3
Publication statusPublished - 1986 May 15

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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