Takashi Imazono

BL13U of NanoTerasu: a beamline for soft and tender X-ray absorption spectroscopy with versatile photon polarization

Yoshiyuki Ohtsubo, Miho Kitamura, Tetsuro Ueno, Hideaki Iwasawa et autres

Abstract A synchrotron radiation beamline BL13U is under commissioning at NanoTerasu, the new 3 GeV high-brilliance synchrotron radiation facility at Tohoku, Japan. BL13U is dedicated for wide-energy-range X-ray absorption spectroscopy, in the soft to tender X-ray energy region (180-3000 eV) with versatile …

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Status of RIXS Beamline BL02U at NanoTerasu

K. Yamamoto, Ralph Ugalino, Kentaro Fujii, Yoshiyuki Ohtsubo et autres

Abstract The construction of the resonant inelastic X-ray scattering (RIXS) beamline BL02U at NanoTerasu was completed in March 2024, with commissioning starting in April 2024. BL02U is a dedicated beamline designed for ultrahigh-resolution RIXS, specifically optimized for a “2D-RIXS spectrometer” utilizing dispersive …

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Design of nano-ARPES beamline at 3-GeV next-generation synchrotron radiation facility, NanoTerasu

Koji Horiba, Takashi Imazono, Hideaki Iwasawa, Kentaro Fujii et autres

Abstract The beamline for angle-resolved photoemission spectroscopy (ARPES) with a nano-focused beam (nano-ARPES) is planned as one of the public beamlines in NanoTerasu, the 3-GeV next-generation synchrotron radiation facility at Tohoku, Japan, which is scheduled to start operation in 2024. A 4 …

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Design of nano-spintronics beamline at 3-GeV next-generation synchrotron radiation facility, NanoTerasu

Yoshiyuki Ohtsubo, Tetsuro Ueno, Hideaki Iwasawa, Jun Miyawaki et autres

Abstract A synchrotron radiation beamline in the soft- and tender-X ray energy range of 180-3000 eV with versatile polarization control has been designed for NanoTerasu, the 3-GeV next-generation synchrotron radiation facility at Tohoku, Japan. A series of four APPLE-II type undulators is …

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Design of Ultrahigh Energy Resolution RIXS Beamline at NanoTerasu

Jun Miyawaki, Kentaro Fujii, Takashi Imazono, Koji Horiba et autres

Abstract The optical design of the ultrahigh-resolution RIXS beamline, which is currently developed at NanoTerasu in Japan, is described. The main goal of this beamline is to perform ultrahigh-resolution RIXS measurements with a total energy resolution of <10 meV at 250–1000 eV …

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テンダーX線回折格子分光器の高分解能化の検討

孝志 今園, 信和 林, 翼 垣尾, 浩行 笹井 et autres

我々は、近年テンダーX線と呼ばれ注目されている1～4 keVの範囲を同時に高分解能計測できる平面結像型分光器の開発に取り組んでいる。分光素子は非周期Ni/C多層膜回折格子で、従前2 keVであった分光範囲の上限を拡張できる上、入射角一定で幅広いエネルギー帯域（1～3.5 keV）を同時計測できる。分解能E/ΔEは100～300で、定性分析に用いられるエネルギー分散型X線分光器に比して約10倍高いものの、化学シフト分析や状態分析までは困難であった。本研究では、高分解能化を図るために平面回折格子と円筒鏡からなる分光器の光学特性を光線追跡等のシミュレーションにより検討した。分光器長は1.8 mで、従前の約0.5 mに比して4倍強ほど大きくなるものの、10～20倍程度高い分解能を期待できる。講演では分光器の設計、光学特性、非周期多層膜コーティング等の詳細について報告する。

Design of a high-resolution flat-field grating spectrometer for tender x-ray emission spectroscopy

Takashi Imazono, 翼 垣尾, 信和 林, 笹井浩行 et autres

高輝度化により次世代放射光施設での利用が期待されるテンダーＸ線領域の高分解能Ｘ線発光分光研究に供する平面結像回折格子分光器の開発を目的に、集光と分散（分光）を個々の光学素子が担うHettrick-Underwood型スリットレス平面結像Ｘ線分光器を設計し、その光学特性を光線追跡等のシミュレーションにより検討した。その結果、我々が従前開発した平面結像分光器（球面回折格子1枚で集光と分散を担う）に比して3倍超の高いエネルギー分解能を示すことが分かった。

Improvement study on heat resistance of multilayer-coated replica gratings

Takashi Imazono, Hiroaki Nishihara, Ryuichi Ukita, Hiroyuki Sasai et autres

We have been developing aperiodic W/B4C multilayer-coated replica gratings for use in the tender X-ray range 2 to 4 keV. It has become apparent that surface degradation was caused by heating multilayer gratings at around 60°C; the multilayer structure has been well …

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Mo-overcoated grating-based beam intensity monitor for 13.9 nm x-ray laser

Takashi Imazono, Hiroaki Nishihara, Ryuichi Ukita, Hiroyuki Sasai et autres

For the purpose of developing a high-efficiency beam intensity monitor with a diffraction grating for a 13.9 nm Ni-like Ag X-ray laser (XRL), a molybdenum thin film was overcoated on a gold-coated holographic grating. The performance was examined by measurements of absolute …

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Mo-overcoated grating-based beam intensity monitor for 13.9 nm X-ray laser

孝志 今園, 西原弘晃, 浮田龍一, 笹井浩行 et autres

波長13.9 nmのＸ線レーザー（XRL）で使用する回折格子ビーム強度モニタの高効率化のために、モリブデン薄膜を金コート回折格子に積層した。放射光を用いた回折効率測定によってMoコーティングによる高効率化を確認した。また、XRLで測定した0次と１次の回折光強度間に強い相関を認めた。ビーム強度モニタの実用性はMo回折格子から供給されたXRLビームを用いた軟Ｘ線エリプソメトリによって実証された。

Performance of a flat-field grating spectrometer for tender x-ray emission spectroscopy

Takashi Imazono, Ryuichi Ukita, Hiroaki Nishihara, Hiroyuki Sasai et autres

A flat-field grating spectrometer for tender x-ray emission spectroscopy has been developed. The grating has been coated with an aperiodic Ni/C multilayer that improves the diffraction efficiency in the range 1–3.5 keV at a constant angle of incidence. The aperiodic layer structure …

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Progress and Prospects of X-Ray Laser Research in QST

Masaharu Nishikino, Noboru Hasegawa, Masahiko Ishino, Takashi Imazono et autres

Recent progress made in the development of coherent x-ray sources and their applications in material science and laser processing in the National Institutes for Quantum and Radiological Science and Technology (QST) is presented herein. The upgrade of Ti:Sapphire laser for a grazing …