Tadashi Hatano

Soft x-ray laminar-type varied-line-spacing multilayer spherical diffraction grating designed for a flat-field grating spectrograph with enhanced spectral flux in the 1–2 keV region

Tadashi Hatano, A. Sagisaka, Masato Koike, Masami Terauchi et autres

A soft x-ray diffraction grating with an aperiodic multilayer coating was designed to enhance spectral flux in a photon energy range of 1-2 keV by means of numerical calculation. Optimized groove depth and angle of incidence were 2.65 nm and 87.50°, respectively, …

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Design of soft x-ray high diffraction efficiency and spectral flux Au/Ni bilayer coated laminar-type diffraction grating for objective soft x-ray flat-field spectrograph in a region of 250–550 eV

Masato Koike, Tadashi Hatano, ALEXANDER S. PIROZHKOV, Takanori Murano et autres

An objective soft x-ray flat-field spectrograph employing a laminar-type bilayer coated, varied-line-spacing, spherical grating was designed to improve the detection limit and sensitivity of soft x-ray flat-field spectrographs in a region of 250-550 eV. As a design criterion, spectral flux, SF, [Hatano …

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Soft x-ray high diffraction efficiency and spectral flux laminar-type W/B4C multilayer diffraction grating for 300–1000 eV

Masato Koike, Tadashi Hatano, ALEXANDER S. PIROZHKOV, Yuki Oue et autres

Multilayer diffraction gratings are designed to improve the detection limit and sensitivity of soft x-ray flat-field spectrographs in the 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 …

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Design of soft x-ray varied-line-spacing (VLS) high-dispersion laminar-type grating coated with super-mirror-type (SMT) multilayer for flat-field spectrograph in a region of 2–4 keV

Masato Koike, Tadashi Hatano, ALEXANDER S. PIROZHKOV, Yukihiko Ueno et autres

A soft x-ray varied-line-spacing (VLS) laminar-type spherical grating with a super-mirror-type (SMT) multilayer was designed for a soft x-ray high resolution flat-field spectrograph in a region of 2-4 keV. The effective groove density of the designed VLS grating is 3200 lines/mm, and …

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Laminar-type gratings overcoated with carbon-based materials to enhance analytical sensitivity of flat-field emission spectrograph in the VUV region

Takanori Murano, Shogo Koshiya, Masato Koike, Tadashi Hatano et autres

Laminar-type spherical diffraction gratings overcoated with carbon-based materials were designed, fabricated, and evaluated for the purpose of enhancing the analytical sensitivity of the flat-field spectrograph in a vacuum ultraviolet region of 35-110 eV. As the design benchmark for numerical calculations, diffraction efficiency …

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Design of soft x-ray laminar-type gratings coated with supermirror-type multilayer to enhance diffraction efficiency in a region of 2–4 keV

Masato Koike, Tadashi Hatano, ALEXANDER S. PIROZHKOV, Yukihiko Ueno et autres

Soft x-ray diffraction gratings coated with a supermirror-type multilayer were designed to enhance diffraction efficiency in the energy range of 2-4 keV by means of numerical calculations. The optimized groove depth and incidence angle are 2.05 nm and 88.65°, respectively, for the …

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Design and experimental evaluation of enhanced diffraction efficiency of lanthanum-based material coated laminar-type gratings in the boron K-emission region

Tadashi Hatano, Masato Koike, Masami Terauchi, ALEXANDER S. PIROZHKOV et autres

Numerical and experimental studies have been performed to evaluate the enhancement of diffraction efficiency of diffraction gratings around B $K$-emission by overcoating lanthanum series layers on conventional metal-coated laminar-type gratings. We propose an optical design method based on the concept of spectral …

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Fabrication and evaluation of a soft X-ray laminar-type diffraction grating of 3200 lines /mm groove density

Tadashi Hatano, Masato Koike, ALEXANDER S. PIROZHKOV, Tsubasa Kakio et autres

Recent developments in soft X-ray emission spectroscopy microscopy

Masami Terauchi, Tadashi Hatano, Masato Koike, ALEXANDER S. PIROZHKOV et autres

Abstract This paper discusses the path to the commercialization of a soft-X-ray emission spectrometer system for EPMA/SEM, its application, how it can be used to investigate new materials, and offers an update on improvements being investigated to further optimise the performance. The …

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Soft x-ray laser beamline for surface processing and damage studies

Masahiko Ishino, Thanh-Hung Dinh, Yuji Hosaka, Noboru Hasegawa et autres

We have developed a soft x-ray laser (SXRL) beamline equipped with an intensity monitor dedicated to ablation study such as surface processing and damage formation. The SXRL beam having a wavelength of 13.9 nm, pulse width of 7 ps, and pulse energy …

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CT performance of compact X-ray source with small focal spot using a 950 keV linear accelerator

Norihito Matsunaga, Tomoya Sato, Atsushi Yamada, Masayuki Zaike et autres

A 950 keV X-ray source with small focal spot using a linear accelerator has been developed. By installing a focusing mechanism of electron beam, smaller focal spot (0.3 mm in FWHM of the line spread function) is successfully achieved at 950 keV. …

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Water-window soft x-ray microscope by a laser-produced plasma source and improvement of spatial resolution by STED phenomenon

Higashiguchi Takeshi, Kawasaki Hiromu, Misaki Shoji, Kageyama Ryo et autres