Measurements of electron-induced neutrons as a tool for determination of electron temperature of fast electrons in the task of optimization laser-produced plasma ions acceleration

Sakaki, Hironao; Nishiuchi, Mamiko; Maeda, Shota; Sagisaka, Akito; Pirozhkov, A. S.; Pikuz, T.; Faenov, A.*; Ogura, Koichi; Fukami, Tomoyo; Matsukawa, Kenya*; et al.

Review of Scientific Instruments, 85(2), p.02A705_1 - 02A705_4, 2014/02

https://doi.org/10.1063/1.4825154

High intensity laser-plasma interaction has attracted considerable interest for a number of years. The laser-plasma interaction is accompanied by generation of various charged particle beams. Results of simultaneous novel measurements of electron-induced photonuclear neutrons (photoneutron), which are a diagnostic of the laser-plasma interaction, are proposed to use for optimization of the laser-plasma ion generation. The proposed method is demonstrated by the laser irradiation with the intensity os 110 W/cm on the metal foil target. The photoneutrons are measured by using NE213 liquid scintillation detectors. Heavy-ion signal is registered with the CR39 track detector simultaneously. The measured signals of the electron-induced photoneutrons are well reproduced by using the Particle and Heavy Ion Transport code System (PHITS). The results obtained provide useful approach for analyzing the various laser based ion beams.

A Laboratory X-ray measurement system of the crystallinity of single crystal for the synchrotron radiation optics

Kiriyama, Koji; Mitsui, Takaya; Fukuda, Yoshihiro

JAEA-Technology 2009-035, 24 Pages, 2009/07

JAEA-Technology-2009-035.pdf:4.07MB

Single crystal for experiment using by synchrotron radiation X-ray is needed to have high quality and performance as optics element. Therefore, quantitative estimation of performance of the single crystal must be done before the experiment. Precise X-ray optics system has been developed at JAEA/Quantum Beam Science Directorate/Synchrotron Radiation Unit at SPring-8. This system can measure small sample that is less than 0.01 mm in size, and have resolving ability of sample rotation that is less than 0.01 degree. And, scanning of sample, it is possible to measure distribution of quality at sample surface. For example, single crystal of FeBO which was measured by this system have been installed in synchrotron radiation Mssbauer spectroscopy using Doppler-shifted 14.4 keV single line Fe-Mssbauer radiation.

Study on imaging and strain mapping in the vicinity of internal crack tip using synchrotron white X-ray

Shibano, Junichi*; Kajiwara, Kentaro*; Kiriyama, Koji; Shobu, Takahisa; Suzuki, Kenji*; Nishimura, Suguru*; Miura, Setsuo*; Kobayashi, Michiaki*

Zairyo, 57(7), p.667 - 673, 2008/07

https://doi.org/10.2472/jsms.57.667

Synchrotron radiation Mssbauer spectroscopy using Doppler-shifted 14.4 keV single line Fe-Mssbauer radiation

Mitsui, Takaya; Seto, Makoto; Masuda, Ryo; Kiriyama, Koji; Kobayashi, Yasuhiro*

Japanese Journal of Applied Physics, Part 2, 46(28), p.L703 - L705, 2007/07

https://doi.org/10.1143/JJAP.46.L703

Synchrotron radiation Mssbauer spectroscopy was performed using a pure nuclear Bragg reflection of a FeBO singlecrystal at the Nel temperature and a Bragg reflection of an oscillating Si single crystal. The developed optical systemfor nuclear diffraction could produce a Doppler-shifted 14.4 keV single-line Fe-Mssbauer radiation and it enabled us to observe the energy-domain synchrotron radiation Mssbauer spectrum with an absorber at rest.

Stabilizing methods against mechanical vibrations of vacuum exhaustion units on BL11XU at SPring-8

Kiriyama, Koji*; Shiwaku, Hideaki

JAERI-Tech 2005-044, 16 Pages, 2005/08

JAERI-Tech-2005-044.pdf:1.31MB

Stabilizing methods for vacuum exhaustion units in the optics section of the beamline have been developed on BL11XU at SPring-8. In this study, we especially focus on the vibrations from scroll pumps in the vacuum exhaustion units. Vibration frequencies are measured directly on the scroll pump under multiple conditions. The results showed that countermeasures to restrain the 30Hz vibration from scroll pumps on the beamline which was caused by working scroll pump are (1) using a damper for scroll pump, (2) pulling out the scroll pump from a vacuum unit support, and (3) settling flexible tubes and the scroll pump on the floor. These methods successfully removed the mechanical vibrations of the scroll pumps. As a result, the amplitude of 30Hz vibration on the monochromator crystals was decreased from 3.310-5mm to 6.210-6mm. The developed method in the present study on BL11XU is expected to apply to the similar vacuum units at the other beamlines.

Stabilizing methods for mechanical vibrations on cryogenically cooled monochromator on BL11XU at SPring-8

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.

Congruent melting of GaN under high pressures and its appliation to single crystal growth

Utsumi, Wataru; Saito, Hiroyuki; Aoki, Katsutoshi; Kaneko, Hiroshi*; Kiriyama, Koji*

Nihon Kessho Gakkai-Shi, 46(4), p.297 - 303, 2004/07

https://doi.org/10.5940/jcrsj.46.297

no abstracts in English

Setup of the X-ray mirror system on BL11XU at SPring-8

Kiriyama, Koji*; Takahashi, Masamitsu; Shiwaku, Hideaki

JAERI-Tech 2004-017, 39 Pages, 2004/03

JAERI-Tech-2004-017.pdf:2.49MB

X-ray mirror system has been installed on a JAERI beam-line, BL11XU, at SPring-8. This system has improved the quality of the reflected X-ray from the monochromator by focusing and removing of higher-order reflections. Here we presented test results of the X-ray mirror system. Reflectivity and FWHM of focusing X-ray by the mirror system are 3 times as strong as and 1/3 as narrow as unfocusing X-ray, respectively. Removal of higher-order reflections was also checked. These results showed that the mirror system on BL1XU was satisfied good performance for experimental use. And we completed a fully systematic instruction manual for operation of the X-ray mirror system on BL11XU quickly and easily. The instruction manual prevents trivial mistakes in operation of the X-ray mirror system on BL11XU and is expected to assist every mirror users on BL11XU in their works.

Cryogenically cooled monochromator with multi-crystal switching system on BL11XU at SPring-8

Shiwaku, Hideaki; Mitsui, Takaya; Tozawa, Kazukiyo*; Kiriyama, Koji*; Harami, Taikan; Mochizuki, Tetsuro*

AIP Conference Proceedings 705, p.659 - 662, 2004/00

https://doi.org/10.1063/1.1757882

We developed a multi-crystal switching system on a cryogenically cooled monochromator of JAERI materials science beamline, BL11XU. In order to study our science, it is necessary for ensuring at least the energy range of 6 - 70keV to employ Si(111) and Si(311) crystals. The principle of the crystal switching is that, two pair of crystals is arranged side by side, and they are translated in horizontal direction for exchanging. Indium sheets were inserted between both sides of crystals in order to improve thermal contact. Some adjustment stages of the monochromator were removed to avoid the crystal vibration and a sheet heater was installed on an X-axis stage to prevent over-cooling of X-axis stages. The monochromator is under commissioning at present. In comparison with a previous indirect water cooling diamond (111) crystal monochromator, this monochromator provides high flux intensity from 4 times to 7 times. It takes only 5 minutes to exchange and adjust crystals geometry. This mechanism will be easily applied to other crystals, for example asymmetrical-cut crystals.

Oscillating inhibition methods of cryogenically-cooled monochromator on BL11XU at SPring-8

Kiriyama, Koji; Shiwaku, Hideaki; Mochizuki, Tetsuro*; Shobu, Takahisa; Tozawa, Kazukiyo*

no journal, , 

Oscillating inhibition methods for mechanical vibrations on the cryogenically-cooled Si monochromator have been developed on BL11XU at SPring-8. The intensity fluctuation of the X-rays of the monochromator was observed. So, we need to identify the vibration sources and take countermeasures against the vibrations to keep quality of X-rays. In this study, the intensity fluctuation of the X-rays, vibrations larger than 1 Hz on the X-rays and the crystals was measured thoroughly. Without the oscillating inhibition methods, observed intensity fluctuation of X-rays was irregular in several minutes and uneven every second. Measured vibration frequencies were mainly 110 Hz, 20 Hz, 55 Hz on X-rays, and were mainly 110 Hz, 30 Hz, and 50 Hz on crystals. The countermeasures were found to be dramatically effective to restrain on the vibrations. As a result, the width of the intensity fluctuation with time decreased from 2.86 percent to 1.46 percent (std. deviation: 0.008302 to 0.004479) that means improving the stability of X-rays from monochromator. The oscillating inhibition methods in the present study on BL11XU at SPring-8 can be applied to the similar monochromator at the other beamlines.