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

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/cm{sup 3}, (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.

Authors:
;  [1]; ; ; ; ;  [2];  [3];  [4]; ;  [5]
  1. Quantum Beam Science Center, Japan Atomic Energy Agency, 8-1-7 Umemidai, Kizugawa, Kyoto 619-0215 Japan (Japan)
  2. Device Dept., Shimadzu Corp., 1Nishinokyo-Kuwabara-cho, Nakagyo-ku, Kyoto 604-8511 Japan (Japan)
  3. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577 Japan (Japan)
  4. Science Equipment Sales Dept., JEOL Ltd., 2-1-1 Ohtemachi, Chiyoda-ku, Tokyo 100-0004 Japan (Japan)
  5. SA Business Unit, JEOL Ltd., 3-1-2 Musashino, Akishima, Tokyo 196-8558 Japan (Japan)
Publication Date:
OSTI Identifier:
22608427
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1741; Journal Issue: 1; Conference: SRI2015: 12. international conference on synchrotron radiation instrumentation, New York, NY (United States), 6-10 Jul 2015; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; BORON; DETECTION; DIAMONDS; DIFFRACTION; DIFFRACTION GRATINGS; EFFICIENCY; EMISSION; INCIDENCE ANGLE; LAYERS; METALS; SIMULATION; SOFT X RADIATION; STEELS; THICKNESS

Citation Formats

Koike, Masato, Imazono, Takashi, Nagano, Tetsuya, Sasai, Hiroyuki, Oue, Yuki, Yonezawa, Zeno, Kuramoto, Satoshi, Terauchi, Masami, Takahashi, Hideyuki, Notoya, Satoshi, and Murano, Takanori. Enhancement of diffraction efficiency of laminar-type diffraction gratings overcoated with diamond-like carbon (DLC) in soft x-ray region. United States: N. p., 2016. Web. doi:10.1063/1.4952917.
Koike, Masato, Imazono, Takashi, Nagano, Tetsuya, Sasai, Hiroyuki, Oue, Yuki, Yonezawa, Zeno, Kuramoto, Satoshi, Terauchi, Masami, Takahashi, Hideyuki, Notoya, Satoshi, & Murano, Takanori. Enhancement of diffraction efficiency of laminar-type diffraction gratings overcoated with diamond-like carbon (DLC) in soft x-ray region. United States. https://doi.org/10.1063/1.4952917
Koike, Masato, Imazono, Takashi, Nagano, Tetsuya, Sasai, Hiroyuki, Oue, Yuki, Yonezawa, Zeno, Kuramoto, Satoshi, Terauchi, Masami, Takahashi, Hideyuki, Notoya, Satoshi, and Murano, Takanori. 2016. "Enhancement of diffraction efficiency of laminar-type diffraction gratings overcoated with diamond-like carbon (DLC) in soft x-ray region". United States. https://doi.org/10.1063/1.4952917.
@article{osti_22608427,
title = {Enhancement of diffraction efficiency of laminar-type diffraction gratings overcoated with diamond-like carbon (DLC) in soft x-ray region},
author = {Koike, Masato and Imazono, Takashi and Nagano, Tetsuya and Sasai, Hiroyuki and Oue, Yuki and Yonezawa, Zeno and Kuramoto, Satoshi and Terauchi, Masami and Takahashi, Hideyuki and Notoya, Satoshi and Murano, Takanori},
abstractNote = {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/cm{sup 3}, (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.},
doi = {10.1063/1.4952917},
url = {https://www.osti.gov/biblio/22608427}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1741,
place = {United States},
year = {Wed Jul 27 00:00:00 EDT 2016},
month = {Wed Jul 27 00:00:00 EDT 2016}
}