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Nakajima, Kenji; Kikuchi, Tatsuya*; Kawamura, Seiko; Kambara, Wataru*
EPJ Web of Conferences, 272, p.02012_1 - 02012_8, 2022/11
We will present some of attempts on AMATEAS, a cold-neutron chopper spectrometer at a pulsed source, to increase time-windows at a single-measurement condition. One of ways is that, by allowing interveined trajectories on the time-of-flight diagram, the usable width selectable for 
is can be increased. Based on our experiences, the conditions of pulse repetition rate multiplication based polychromatic 
measurements on chopper spectrometers at pulsed sources will be discussed. Optimization of wide-band polychromatic measurements and a generalized formulated condition will be proposed. Application of our idea to existing spectrometers and to the criteria design of an optimized chopper spectrometer will be also discussed with suggesting further possibility to improve efficiency by modifying the pulse shaping chopper.
Osakabe, Toyotaka
Hamon, 31(1), p.14 - 17, 2021/02
no abstracts in English
Namba, Shinichi*; Hasegawa, Noboru; Kishimoto, Maki; Nishikino, Masaharu; Ishino, Masahiko; Kawachi, Tetsuya
AIP Advances (Internet), 5(11), p.117101_1 - 117101_10, 2015/11
Times Cited Count：3 Percentile：13.89(Nanoscience & Nanotechnology)To characterize the temporal evolution of ultrashort X-ray pulses emitted by laser plasmas using a pump-probe method, a magnetic bottle time-of-flight electron spectrometer is constructed. The design is determined by numerical calculations of a mirror magnetic field and of the electron trajectory in a flight tube. The performance of the spectrometer is characterized by measuring the electron spectra of xenon atoms irradiated with a laser-driven plasma X-ray pulse. In addition, as a preliminary experiment, two-color above-threshold ionization (ATI) is conducted, in which xenon atoms are simultaneously irradiated with an X-ray laser pump and an IR laser probe. The correlation in the intensity of the Auger sideband spectra and in the time delay of the two laser pulses yields an X-ray pulse width of 5.7 ps, in good agreement with the value obtained using an X-ray streak camera.
Terauchi, Masami*; Imazono, Takashi; Koike, Masato
Hyomen Kagaku, 36(4), p.184 - 188, 2015/04
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.
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.
Kiriyama, Koji*; Shiwaku, Hideaki; Mochizuki, Tetsuro*; Shobu, Takahisa*; Tozawa, Kazukiyo*
JAERI-Tech 2005-003, 36 Pages, 2005/03
JAERI-Tech-2005-003.pdf:4.19MB
Multi-stabilizing methods for vibrations on the cryogenically cooled monochromator have been tried on BL11XU at SPring-8. Observed vibrations on crystals were mainly 1-10 Hz, 30 Hz, and 50 Hz. The results suggested that sources of the vibrations were liquid nitrogen flow and propagation from vibrations of vacuum pumps equipped with beam line. We took countermeasures of the vibrations to liquid nitrogen tubes, and set parameters (temperature, pressure and flow-late) of the cryogenic cooling system for 1-10 Hz vibration. Vibration absorber was set not to propagate the vibrations from the vacuum pumps and their fans for 30 and 50 Hz vibrations. These methods successfully removed the mechanical vibrations. Then, intensity vibration of X-ray was decreased from 4.47 % to 0.85 %, in the end. The stabilizing methods on BL11XU are expected to apply to the similar system at the other beam-lines.
by neutron scatteringShamoto, Shinichi; Tsubota, Masami*; Iga, Fumitoshi*; F
k, B.*; Kajitani, Tsuyoshi*
Journal of Neutron Research, 13(1-3), p.175 - 178, 2005/03
YTiO with T
~30 K has been studied by the MARI spectrometer with E
=130 meV and 500 meV at T=5 K, 40K, and 200 K. We have not found any clear orbital excitation in a wide Q-E range (0.5
Q25
, 6E350 meV). The intensity of orbital excitation would be significantly weak in comparison with the phonon.
Koike, Masato; Namioka, Takeshi*
AIP Conference Proceedings 705, p.865 - 868, 2004/00
The high brightness soft X-ray sources have been playing an important role in frontier sciences and high technologies. Then it is often required to perform high-resolution spectroscopic measurements in the energy region of 1-10 keV by using a single instrument. Unfortunately, both the grating and the crystal spectrometer cannot meet the requirement satisfactorily, because of various problems they have in the efficiency, spectral resolution, and wavelength scanning range. To overcome these problems we have developed a conical diffraction type grating spectrometer for use in the 1-4 keV region. The spectrometer employs a toroidal mirror and a plane holographic grating to separate the imaging and dispersing functions. This spectrometer works both as monochromator and as spectrograph. In this paper, we describe details of the design and give the expected performance of the spectrometer for cases of practical interest in the use of soft X-ray synchrotron radiation and laboratory sources.
Terauchi, Masami*; Koike, Masato
Microscopy and Microanalysis, 9(S02), p.894 - 895, 2003/08
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.
Koike, Masato; Sano, Kazuo*; Gullikson, E. M.*; Harada, Yoshihisa*; Kumata, Hideki*
Review of Scientific Instruments, 74(2), p.1156 - 1158, 2003/02
Times Cited Count：24 Percentile：72.13(Instruments & Instrumentation)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.
Oyama, Kenji*; Ito, Shinichi*; Otomo, Toshiya*; Osakabe, Toyotaka; Suzuki, Junichi; Matsuda, Masaaki; Kuwahara, Keitaro*; Arai, Masatoshi*
Applied Physics A, 74(Suppl.1), p.S1598 - S1600, 2002/12
Times Cited Count：2 Percentile：11.51(Materials Science, Multidisciplinary)no abstracts in English
Koike, Masato
Saishin Kogaku Gijutsu Handobukku, p.284 - 287, 2002/09
no abstracts in English
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.
Koike, Masato; Sano, Kazuo*; Yoda, Osamu; Harada, Yoshihisa*; Ishino, Masahiko; Moriya, Naoji*; Sasai, Hiroyuki*; Takenaka, Hisataka*; Gullikson, E. M.*; Mrowka, S.*; et al.
Review of Scientific Instruments, 73(3), p.1541 - 1544, 2002/03
Times Cited Count：20 Percentile：68.31(Instruments & Instrumentation)no abstracts in English
Koike, Masato; Namioka, Takeshi*
Applied Optics, 41(1), p.245 - 257, 2002/01
Times Cited Count：14 Percentile：54.48(Optics)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.
Marushita, Motoharu*; Mitsui, Takaya; Fukuda, Tatsuo; Takahashi, Masamitsu; Inami, Toshiya; Katayama, Yoshinori; Shiwaku, Hideaki; Mizuki, Junichiro
Nuclear Instruments and Methods in Physics Research A, 467-468(Part.1), p.392 - 395, 2001/07
Times Cited Count：4 Percentile：33.81(Instruments & Instrumentation)no abstracts in English
-edgesYoshigoe, Akitaka; Agui, Akane; Nakatani, Takeshi*; Matsushita, Tomohiro*; Saito, Yuji; Yokoya, Akinari
Journal of Synchrotron Radiation, 8(Part2), p.502 - 504, 2001/03
no abstracts in English
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
Times Cited Count：12 Percentile：64.73(Nuclear Science & Technology)no abstracts in English
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
Konishi, Hiroyuki; Shiwaku, Hideaki; Yoneda, Yasuhiro; Mitsui, Takaya; Nishihata, Yasuo
SPring-8 Riyosha Joho, 4(5), p.4 - 8, 1999/09
no abstracts in English
