TY - GEN
T1 - Enhancement of diffraction efficiency of laminar-type diffraction gratings overcoated with diamond-like carbon (DLC) in soft x-ray region
AU - Koike, Masato
AU - Imazono, Takashi
AU - Nagano, Tetsuya
AU - Sasai, Hiroyuki
AU - Oue, Yuki
AU - Yonezawa, Zeno
AU - Kuramoto, Satoshi
AU - Terauchi, Masami
AU - Takahashi, Hideyuki
AU - Notoya, Satoshi
AU - Murano, Takanori
N1 - Publisher Copyright:
© 2016 Author(s).
PY - 2016/7/27
Y1 - 2016/7/27
N2 - 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.
AB - 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.
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U2 - 10.1063/1.4952917
DO - 10.1063/1.4952917
M3 - Conference contribution
AN - SCOPUS:84984538858
T3 - AIP Conference Proceedings
BT - Proceedings of the 12th International Conference on Synchrotron Radiation Instrumentation, SRI 2015
A2 - Chubar, Oleg
A2 - Jarrige, Ignace
A2 - Kaznatcheev, Konstantine
A2 - Miller, Lisa
A2 - Stavitski, Eli
A2 - Tanabe, Toshiya
A2 - Shaftan, Timur
A2 - Shen, Qun
A2 - Pindak, Ronald
A2 - Nelson, Christie
A2 - Kalbfleisch, Sebastian
A2 - Thieme, Juergen
A2 - Williams, Garth
A2 - Fuchs, Martin
A2 - Rumaiz, Abdul
A2 - Wang, Jun
A2 - Evans-Lutterodt, Kenneth
A2 - Lee, Wah-Keat
A2 - McSweeney, Sean
A2 - Vescovo, Elio
PB - American Institute of Physics Inc.
T2 - 12th International Conference on Synchrotron Radiation Instrumentation, SRI 2015
Y2 - 6 July 2015 through 10 July 2015
ER -