IEEJ Transactions on Fundamentals and Materials
Online ISSN : 1347-5533
Print ISSN : 0385-4205
ISSN-L : 0385-4205
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  • Kazutaka Isoda, Kohki Nagata, Mizue Ebisawa, Yukitoshi Otani
    2020 Volume 140 Issue 10 Pages 500-501
    Published: October 01, 2020
    Released: October 01, 2020
    JOURNALS RESTRICTED ACCESS

    The seasonal behavior of one-dimensional periodic structure is validated. The structure has angular dependence of reflectivity that changes from high reflectivity for summer to low reflectivity for winter. Sunlight simulator is used for exposing the one-dimensional periodic structure and non-structured surface to measure the substrate temperature while changing the angle of incidence from 0 degree to 70 degree. As a result, maximum temperature difference of these structures is achieved where 1.2°C at an angle of incidence of 40 degree.

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  • Ryo Someya, Haruaki Tanaka, Qinghong Cao, Yunhan Cai, Hiroshi Tanabe, ...
    2020 Volume 140 Issue 10 Pages 502-503
    Published: October 01, 2020
    Released: October 01, 2020
    JOURNALS RESTRICTED ACCESS

    We developed a new Doppler probe array with two pairs of view-lines to measure 1D ion flow vector. Using this array, just two glass tube insertion enables us to measure 1D ion flow and temperature profile. By use of four mirrors for one measurement point, the system receives the emission of ion in four different directions and that enables us to measure local ion flow vector. It is useful for ion outflow measurement caused by magnetic reconnection.

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  • Kaisei Enoki, Ushio Chiba, Hiroaki Miyake, Yasuhiro Tanaka
    2020 Volume 140 Issue 10 Pages 504-505
    Published: October 01, 2020
    Released: October 01, 2020
    JOURNALS RESTRICTED ACCESS

    Surface materials of spacecraft operated in low and medium earth orbits, such as positioning satellite and earth observation satellite, are charged and discharged duet to radio-active rays, such as electrons and protons. Such the electro-static discharge is one of the origin of satellite operation anomaly. Therefore, in this study, we focus the FEP (fluorinated-ethylene-propylene copolymer) irradiated by proton and measure the space charge distribution using newly developed on-site space charge measurement system which can measure space charge accumulation during proton irradiation. We were able to get the result that positive charges were accumulated and saturated during irradiation. After saturation, the accumulated positive charges in the bulk were decreased during irradiation.

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  • Shinichi Mitsumoto, Muneaki Kurimoto, Masayuki Fujii, Masumi Fukuma, L ...
    2020 Volume 140 Issue 10 Pages 506-507
    Published: October 01, 2020
    Released: October 01, 2020
    JOURNALS RESTRICTED ACCESS

    DC conduction current and space charge characteristics of laminate elastomer sheets with different laminating directions are investigated. Samples (N,V, H) were prepared as 3 types of the laminate elastomer sheets with different laminating directions using stereolithographic 3D printer. Sample N has no lamination. Sample V has the vertical laminating directions against the sample surface. Sample H has the horizontal laminating direction against sample surface. The sample thickness was around 0.5 mm and the laminating pitch was 0.05mm. The DC conduction current was measured by using current integration meter. Space charge distribution was measured using the pulsed electro-acoustic system. The experiments were carried out at 27°C. The accumulated positive charge amount near anode in sample H was larger than that in V and N. The conductivity was almost field-independent up to around 5kV/mm, but above 5kV/mm it increases with increase of electric field irrespective of difference among samples. It is considered that the conductivity of laminate elastomer sheets is governed by the same basic mechanism and parameter values regardless of space charge accumulation and laminating directions, albeit with slightly different magnitudes.

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