Enhancement of diffraction efficiency of laminar-type diffraction gratings overcoated with diamond-like carbon (DLC) in soft x-ray region

Masato Koike, Takashi Imazono, Tetsuya Nagano, Hiroyuki Sasai, Yuki Oue, Zeno Yonezawa, Satoshi Kuramoto, Masami Terauchi, Hideyuki Takahashi, Satoshi Notoya, Takanori Murano

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    1 Citation (Scopus)

    Abstract

    Boron is the critical trace element in the production of high quality steel, creating a great demand for an efficient detection method of the B-K emission band at around 6.76 nm. To meet this demand we made a simulation study and obtained a practical method to improve the diffraction efficiency of metal-coated laminar-type gratings for a grazing incidence flat-field spectrograph by overcoating a sufficiently transparent high-density material. In the simulation the diffraction efficiency in a spectral region of 3.5-8.5 nm was computed for several combinations of overcoating materials and coating metals, with various thicknesses of the overcoating layer. The result obtained are: (1) the best overcoating material is high-density diamond-like carbon (DLC) having a density of 3.1 g/cm3, (2) its optimum thickness is 24 nm at an angle of incidence of 87.0°, and (3) with this thickness the first-order diffraction efficiency is expected to reach 29.7 %, which well exceeds 15.6 % for Ni-coated (or 14.1 % for Au-coated) grating.

    Original languageEnglish
    Title of host publicationProceedings of the 12th International Conference on Synchrotron Radiation Instrumentation, SRI 2015
    EditorsOleg Chubar, Ignace Jarrige, Konstantine Kaznatcheev, Lisa Miller, Eli Stavitski, Toshiya Tanabe, Timur Shaftan, Qun Shen, Ronald Pindak, Christie Nelson, Sebastian Kalbfleisch, Juergen Thieme, Garth Williams, Martin Fuchs, Abdul Rumaiz, Jun Wang, Kenneth Evans-Lutterodt, Wah-Keat Lee, Sean McSweeney, Elio Vescovo
    PublisherAmerican Institute of Physics Inc.
    ISBN (Electronic)9780735413986
    DOIs
    Publication statusPublished - 2016 Jul 27
    Event12th International Conference on Synchrotron Radiation Instrumentation, SRI 2015 - New York, United States
    Duration: 2015 Jul 62015 Jul 10

    Publication series

    NameAIP Conference Proceedings
    Volume1741
    ISSN (Print)0094-243X
    ISSN (Electronic)1551-7616

    Other

    Other12th International Conference on Synchrotron Radiation Instrumentation, SRI 2015
    Country/TerritoryUnited States
    CityNew York
    Period15/7/615/7/10

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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