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Future lunar mission Active X-ray Spectrometer development: Surface roughness and geometry studies
Naito, M.,Hasebe, N.,Kusano, H.,Nagaoka, H.,Kuwako, M.,Oyama, Y.,Shibamura, E.,Amano, Y.,Ohta, T.,Kim, K.J.,Lopes, J.A.M. Elsevier 2015 Nuclear instruments & methods in physics research. Vol.788 No.-
<P><B>Abstract</B></P> <P>The Active X-ray Spectrometer (AXS) is considered as one of the scientific payload candidates for a future Japanese mission, SELENE-2. The AXS consists of pyroelectric X-ray generators and a Silicon Drift Detector to conduct X-Ray Fluorescence spectroscopy (XRF) on the Moon to measure major elements: Mg, Al, Si, Ca, Ti, and Fe; minor elements: Na, K, P, S, Cr and Mn; and the trace element Ni depending on their concentration. Some factors such as roughness, grain size and porosity of sample, and the geometry of X-ray incidence, emission and energy will affect the XRF measurements precision. Basic studies on the XRF are required to develop the AXS. In this study, fused samples were used to make homogeneous samples free from the effect of grain size and porosity. Experimental and numerical studies on the XRF were conducted to evaluate the effects from incidence and emission angles and surface roughness. Angle geometry and surface roughness will be optimized for the design of the AXS on future missions from the results of the experiment and the numerical simulation.</P>
T. Ohnishi,S. Mizusaki,M. Naito,Y. Nagata,M. Itou,Y. Sakurai,T. C. Ozawa,Y. Noro,H. Samata 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
The crystallographic, magnetic and transport properties of Sr1−xCaxRu0.5Mn0.5O3 were studiedto reveal the effects of crystal symmetry on the magnetism and the transport properties of antiferromagneticSrRu1−yMnyO3 (y > 0.2). The Ca-content dependences of the lattice constants and volumesuggest that the mixed valence state of Mn3+, Mn4+, Ru4+, and Ru5+ ions in SrRu0.5Mn0.5O3is held for Ca substitution. However, a structural transformation from tetragonal to orthorhombicsymmetry occurs at a Ca content of x 0.2, and a ferromagnetic state appears simultaneously. The Weiss temperature of all samples has a positive value regardless of the magnetic state. Theresistivity decreases as the Ca content increases, and the high temperature part of the resistivitycould be fitted by using the variable range hopping (VRH) model. The localization length increasesas soon as ferromagnetism appears. The Curie temperature seems to depend on the distance betweentransition metal ions. The antiferromagnetic state was explained by using the competitionbetween a ferromagnetic interaction along the c-axis and an antiferromagnetic interaction in theab-plane, and the orthorhombic ferromagnetic state was explained by using a three-dimensionalferromagnetic interaction between Mn ions.
takaki Hatae,H. Yoshida,M. Nakatsuka,O. Naito,S. Kitamura,T. Hamano,T. Sakuma 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
Phase conjugate mirror based on stimulated Brillouin scattering (SBS) is a fundamentally new and promising technology, and it is applicable to plasma diagnostics in order to improve the measurement performance. A review is presented about the applications of SBS phase conjugation to Thomson scattering diagnostics in JT-60U and ITER. Proposed applications using the phase conjugate mirror to plasma diagnostics, namely double-pass and multipass Thomson scattering methods, were described. Improvement of diagnostic laser system for Thomson scattering employing the phase conjugate mirror are also described.I