宇宙科学広報・普及主幹付

Sumitaka Tachikawa

  (太刀川 純孝)

Profile Information

Affiliation
Japan Aerospace Exploration Agency
Tokyo University of Science
Degree
博士(工学)(東京工業大学)

J-GLOBAL ID
202101020564375130
researchmap Member ID
R000015338

Awards

 2

Papers

 37
  • Rie Endo, Yuto Suganuma, Kazuki Endo, Tsuyoshi Nishi, Hiromichi Ohta, Sumitaka Tachikawa
    INTERNATIONAL JOURNAL OF THERMOPHYSICS, 43(7), Jul, 2022  Peer-reviewed
    This study aimed to measure the thermal effusivity distribution on a lunar regolith simulant (FJS-1) using a thermal microscope and to calculate the average thermal effusivity and thermal conductivity using density and specific heat. Moreover, discussions were conducted based on the results of the microstructural analysis of the sample. The FJS-1 particles were embedded in an epoxy resin and polished to a mirror finish. The samples were analyzed using scanning electron microscopy equipped with energy-dispersive X-ray spectroscopy (SEM-EDS). X-ray diffraction (XRD) was performed to identify the mineral phases in FJS-1. The results of SEM-EDS and XRD showed that a single sand particle was composed of several minerals, such as anorthite and olivine. Then, the thermal microscope was used to obtain the distribution of the thermal effusivity of a particle from the mirror-finished sample in a 1 x 1 mm(2) area with intervals of 10 mu m. The measured thermal effusivity correlates with the SEM image of the sample. Anorthite has a small thermal effusivity of 1.99 +/- 0.31 kJ center dot s(-0.5)center dot m(-2)center dot K-1, while olivine has a large thermal effusivity of 2.73 +/- 0.35 kJ center dot s(-0.5)center dot m(-2)center dot K-1. In both cases, the thermal effusivity was found to be of the same order of magnitude as the reported values. The average thermal effusivity and conductivity of a single particle were determined to be 2.4 +/- 0.6 kJ center dot s(-0.5)center dot m(-2)center dot K-1 and 2.6 +/- 1.3 W m(-1)center dot K-1, respectively, based on the proportion of existing phases.
  • Sumitaka Tachikawa, Hosei Nagano, Akira Ohnishi, Yuji Nagasaka
    International Journal of Thermophysics, 43(6), Jun, 2022  Peer-reviewed
    Abstract In recent planetary exploration space missions, spacecraft are exposed to severe thermal environments that are sometimes more extreme than those experienced in earth orbits. The development of advanced thermal control materials and devices together with reliable and accurate measurements of their thermophysical properties are needed for the development of systems designed to meet the engineering challenges associated with these space missions. We provide a comprehensive review of the state-of-the-art advanced passive thermal control materials and devices that are available for space applications, specifically, variable emissivity thermal control materials and microelectromechanical systems (MEMS), radiofrequency (RF)-transparent and/or tunable solar absorptivity and total hemispherical emissivity thermal control materials, and a passive re-deployable radiator with advanced materials and insulation. Prior to our in-depth review of these thermal control materials, we briefly summarize the thermal environments surrounding spacecraft, the characteristics of thermophysical properties for spacecraft materials that differ from those of materials for ground use, and the significance of solar absorptivity and total hemispherical emissivity for passive thermal control in space. In all four topics of materials and devices, the following subjects are overviewed: the basic principle of passive thermal control techniques in space, the measurement of thermophysical properties of those novel materials, simulation and/or on-orbit verification thermal performance tests, degradation tests in space environments, and some aspects of the implementation of the above-described materials and devices in actual space missions.
  • 冨岡孝太, 太刀川純孝, 長坂雄次
    熱物性, 35(1), 2021  Peer-reviewed

Misc.

 16

Books and Other Publications

 1

Presentations

 30

Major Research Projects

 7

Industrial Property Rights

 6

Major Other

 4

● 指導学生等の数

 6
  • Fiscal Year
    2021年度(FY2021)
    Doctoral program
    0人
    Students under Cooperative Graduate School System
    2人(東京理科大学大学院)
    Students under Skills Acquisition System
    1人(慶應義塾大学)、2人(慶應義塾大学大学院)
  • Fiscal Year
    2020年度(FY2020)
    Doctoral program
    0人
    Students under Cooperative Graduate School System
    3人(東京理科大学大学院)
    Students under Skills Acquisition System
    1人(東京理科大学)、3人(慶應義塾大学大学院)
  • Fiscal Year
    2019年度(FY2019)
    Doctoral program
    0人
    Students under Cooperative Graduate School System
    3人(東京理科大学大学院)
    Students under Skills Acquisition System
    1人(東京理科大学)、2人(慶應義塾大学)、2人(慶應義塾大学大学院)
  • Fiscal Year
    2018年度(FY2018)
    Doctoral program
    1人
    Students under Cooperative Graduate School System
    1人(東京理科大学大学院)
    Students under Skills Acquisition System
    2人(東京理科大学)、1人(慶應義塾大学)、2人(慶應義塾大学大学院)
  • Fiscal Year
    2022年度(FY2022)
    Doctoral program
    0人
    Students under Cooperative Graduate School System
    2人(東京理科大学大学院)
    Students under Skills Acquisition System
    1人(慶應義塾大学)、1人(慶應義塾大学大学院)、1人(東京理科大学)、1人(新潟大学大学院)
  • Fiscal Year
    2023年度(FY2023)
    Doctoral program
    0人
    Students under Cooperative Graduate School System
    1人(東京理科大学大学院)
    Students under Skills Acquisition System
    1人(慶應義塾大学)、2人(慶應義塾大学大学院)、2人(新潟大学大学院)、1人(上智大学大学院)

● 所属する所内委員会

 1
  • ISAS Committee
    化学物質専門部会(2019.12~現在)