| アイテムタイプ |
学術雑誌論文 / Journal Article(1) |
| 公開日 |
2024-07-29 |
| タイトル |
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タイトル |
Soft X-ray high diffraction efficiency and spectral flux laminar-type W/B4C multilayer diffraction grating for 300-1000 eV |
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言語 |
en |
| 言語 |
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言語 |
eng |
| 資源タイプ |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
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資源タイプ |
journal article |
| 著者 |
Koike Masato
Hatano Tadashi
Alexander Pirozhkov
Oue Yuki
Murano Takanori
Tsubasa Kakio
Koshiya Shogo
Kondo Kiminori
Terauchi Masami
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| 抄録 |
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内容記述タイプ |
Abstract |
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内容記述 |
Multilayer diffraction gratings were designed to improve detection limit and sensitivity of soft X-ray flat-field spectrograph in a region of 300?1000 eV placing emphasis on Fe-L (705 eV), Cu-L (930 eV), and Zn-L (1012 eV) emissions. For this purpose, spectral flux was used as the performance index which is proportional to the amount of optical flux incident into a detector and correlated with detection sensitivity. A super-mirror-type (SMT) W/B4C multilayer coating (M. Koike et al., Rev.Sci. Instrum. 94, 045109 (2023) ) was employed to improve diffraction efficiency in a wide energy region. The unique feature of the multilayer structure is that the average refractive index as well as the period length of W/B4C layers pairs are increased from the bottom to top of layers. Also, incidence angle and nominal groove density were reduced 86.03° from 88.65° and increased to 3200 lines/mm from 2400 lines/mm of our previous design, respectively, to improve spectral flux while maintaining dispersion and spectral resolution. A holographic varied-line-spacing (VLS) spherical grating and soft X-ray flat-field spectrograph was designed, assuming aspherical-wavefront-recording (AWR) method, assuming the nominal grating constant and incident angle described above. The numerical simulation results showed that the spectrograph employing newly designed grating with the W/B4C multilayer indicated 3.2?8.2 times higher spectral flux comparing with those obtained with the previously designed grating and spectrograph while keeping same spectral resolution. |
| 書誌情報 |
Review of Scientific Instruments
巻 95,
号 7,
p. 073104-1-073104-6,
発行日 2024-07
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| 出版者 |
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出版者 |
American Institute of Physics |
| DOI |
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識別子タイプ |
DOI |
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関連識別子 |
10.1063/5.0210772 |
