Fabrication of neutron optical devices using PBW technique

Sakai, Takuro; Iikura, Hiroshi; Yamada, Naoto*; Sato, Takahiro*; Ishii, Yasuyuki*; Uchida, Masaya*

QST-M-8; QST Takasaki Annual Report 2016, P. 140, 2018/03

https://repo.qst.go.jp/records/73811

Chemical state analysis with soft-X-ray emission spectroscopy based on SEM

Terauchi, Masami*; Imazono, Takashi; Koike, Masato

Hyomen Kagaku, 36(4), p.184 - 188, 2015/04

https://doi.org/10.1380/jsssj.36.184

Electron beam induced soft-X-ray emission spectroscopy (SXES) that uses a grating spectrometer has been introduced to a conventional scanning electron microscope (SEM) for characterizing desired specimen areas of bulk materials. The spectrometer has a grazing-incidence flat-field optics by using aberration corrected (varied-line-spacing) gratings, which has already been applied to transmission electron microscopes. The best resolution was confirmed as 0.13 eV at Mg L-emission (50 eV), which is comparable with that of recent dedicated electron energy-loss spectroscopy instruments. Apparent band structure effects have been observed in Mg-L, Si-L, B-K, and Ti-L emission spectra obtained from bulk materials using SEM-SXES instrument.

Vacuum ultraviolet spectrometer; Ray tracing

Koike, Masato; Sano, Kazuo*

Dai-5-Han Jikken Kagaku Koza 10; Busshitsu No Kozo 2, Bunko (Ge), 10, p.106 - 153, 2005/08

The chapter provides the basic knowledge of "vacuum ultraviolet spectrometers" and "ray racing" for young scientists without reading the numerous references and is intend to be the handbook for the specialist in various related sciences when they initiate spectroscopic experiments in the vacuum ultraviolet region. The content includes the basis of diffraction gratings, Optical properties of diffraction gratings, aberration theories, diffraction efficiency theories, basis of spectrometers, vacuum ultraviolet plane grating spectrometers, vacuum ultraviolet concave grating spectrometers, soft X-ray plane grating spectrometers, soft X-ray concave grating spectrometers, basis of ray tracing, applications of ray tracing, analytic design method, hybrid design method, etc.

A New high energy-resolution soft-X-ray spectrometer for a transmission electron microscope

Terauchi, Masami*; Koike, Masato

Microscopy and Microanalysis, 9(S02), p.894 - 895, 2003/08

https://doi.org/10.1017/S1431927603444474

We have been developing a high energy-resolution soft-X-ray spectrometer for a transmission electron microscope to obtain the information of the density of states (DOS) of the valence band (occupied states) from identified small specimen areas. We have designed and produced a new grating. The new varied-line-spacing laminar-type holographic grating was designed to have a focal distance of about 50 cm. An energy resolution of about 0.7 eV is expected for X-ray energy of about 1000 eV.

Performance of laminar-type holographic grating for a soft X-ray flat field spectrograph in the 0.7-6 nm region

Koike, Masato; Sano, Kazuo*; Gullikson, E. M.*; Harada, Yoshihisa*; Kumata, Hideki*

Review of Scientific Instruments, 74(2), p.1156 - 1158, 2003/02

https://doi.org/10.1063/1.1533097

Laminar-type holographic grating having a groove density of 2400 lines/mm was designed and fabricated for use with a soft X-ray flat field spectrograph covering the 0.7-6 nm region. The varied-line-spaced grating pattern was generated by use of an aspheric wave-front recording system and the laminar-type grooves were formed by a reactive ion-etching method. The performance of the grating was evaluated by using a molybdenum K X-ray generator and a spectrograph with a CCD imaging detector. Also the absolute diffraction efficiencies of 0th, 1st, 2nd, and 3rd spectral orders were measured by use of the reflectometers installed at synchrotron radiation beamlines. The experimental results showed that the holographic grating indicated comparable spectral resolution and maximum first-order diffraction efficiency (2%) at 2 nm with a replica grating made from a mechanically ruled varied-line-spacing grating, and it also showed higher efficiency in 1.0nm region and lower level higher order light over the whole wavelength range than the replica grating.

New type of Monk-Gillieson monochromator capable of covering a 0.7- to 25-nm range

Koike, Masato; Sano, Kazuo*; Harada, Yoshihisa*; Yoda, Osamu; Ishino, Masahiko; Tamura, Keisuke*; Yamashita, Kojun*; Moriya, Naoji*; Sasai, Hiroyuki*; Jinno, Masafumi*; et al.

X-Ray Mirrors, Crystals, and Multilayers II (Proceedings of SPIE Vol.4782), p.300 - 307, 2002/07

For the purpose of realizing an evaluation beamline for characterizing soft X-ray optical elements in a wide wavelength range of 0.7-25 nm, we have designed and constructed a new type of monochromator that combined two types of Monk-Gillieson monochromators. One is a conventional type equipped with three varied-line-spacing plane gratings, allowing a choice of two included angles. The other is a new type that employs a scanning mechanism based on Surface Normal Rotation (SNR). The SNR scheme provides high throughput at short wavelengths and simple scanning mechanism by means of a grating rotation about its normal. The monochromator is operated in the SNR and conventional modes over the ranges of 0.7-2.0 nm and 2.0-25 nm, respectively. In this paper we describe the optical and mechanical designs of the monochromator, wavelength calibrations in the SNR mode, and preliminary experimental data, such as the transmittance of an Al filter at 0.8 nm and the total yield photoelectron measurement on a MgO powder in a wavelength rage of 0.7-2 nm.

Grazing-incidence Monk-Gillieson monochromator based on surface normal rotation of a varied-line-spacing grating

Koike, Masato; Namioka, Takeshi*

Applied Optics, 41(1), p.245 - 257, 2002/01

https://doi.org/10.1364/AO.41.000245

A plane grating monochromator having a simple wavelength scanning method requiring only a rotation of a grating about its normal was analyzed on the basis of the light path function. This scanning method has been known as surface normal rotation (SNR). A varied line spacing (VLS) plane grating was assumed to be illuminated by a convergent beam generated by a spherical mirror. We gave the analytical expressions for the grating equation, focal conditions, direction of dispersion, slant angle and length of astigmatic image, and a method to optimize the groove parameters of the VLS grating. The results of this analysis and the expected resolving power were evaluated by means of ray tracing for two model systems.

Electron temperature perturbations measured by electron cyclotron emission diagnostic systems in JT-60U

Isayama, Akihiko; Isei, Nobuaki; Ishida, Shinichi; Sato, Masayasu; Kamada, Yutaka; Ide, Shunsuke; Ikeda, Yoshitaka; Takahashi, Koji; Kajiwara, Ken; Hamamatsu, Kiyotaka; et al.

Fusion Engineering and Design, 53(1-4), p.129 - 135, 2001/01

https://doi.org/10.1016/S0920-3796(00)00488-9

no abstracts in English

Varied-line-spacing laminar-type holographic grating for the standard soft X-ray flat-field spectrograph

Koike, Masato; Namioka, Takeshi*; Gullikson, E. M.*; Harada, Yoshihisa*; Ishikawa, Sadayuki*; Imazono, Takashi*; Mrowka, S.*; Miyata, Noboru; Yanagihara, Mihiro*; Underwood, J. H.*; et al.

Soft X-Ray and EUV Imaging Systems (Proceedings of SPIE Vol.4146), p.163 - 170, 2000/00

no abstracts in English

Recent holographic gratings for soft X-ray region

Koike, Masato

X-sen Ketsuzo Kogaku Nyuzu Reta, (9), p.1 - 2, 1999/02

http://mml.tagen.tohoku.ac.jp/xio/news_letter/pdfs/X-rayNL_9.pdf

no abstracts in English