Research, Test and Operation Technology Grp.

坂本 勇樹

サカモト ユウキ  (Yuki SAKAMOTO)

基本情報

所属
国立研究開発法人宇宙航空研究開発機構 宇宙科学研究所 宇宙飛翔工学研究系 助教
学位
博士(工学)(早稲田大学)

J-GLOBAL ID
201901007239946011
researchmap会員ID
B000355489

論文

 22
  • Taisei SHIMODA, Takumi MIYASE, Motohide AKUTSU, Kotaro SHIMADA, Yuki SAKAMOTO, Tetsuya SATO
    JAPANESE JOURNAL OF MULTIPHASE FLOW 38(2) 157-164 2024年6月15日  
  • Hideki Tatsumoto, Takumi Hasegawa, Yuki Sakamoto, Yuki Shiro, Yuka Horikawa, Hiroaki Kobayashi, Makoto Teshigawara, Hossein Sina
    Cryogenics 139 2024年4月  
    At the European Spallation Source (ESS) ERIC, the liquid hydrogen moderator development is undertaken for its predominantly high parahydrogen fraction, which helps to attain a higher neutron intensity at a very high brightness. The Cryogenic Moderator System (CMS) is equipped with a catalyst to convert hydrogen from the ortho to the parastate to keep desirably high parahydrogen fractions of more than 99.5% in the cold moderators, which is required to deliver high brightness cold neutron beams to the neutron instruments. An in-situ measurement system for the ortho and para fractions of liquid hydrogen (OPMS) has been developed using a Raman spectroscopy to detect any undesirable shift towards a high orthohydrogen fraction caused by neutron scattering driven para-to-ortho back conversion. A Raman optics system was installed into a mock-up OPMS vacuum chamber and its performance evaluation tests have been conducted by flowing liquid hydrogen. It was verified that the developed Raman optics system succeeded in measuring the parahydrogen fraction with an accuracy of 0.1%, which met the requirement.
  • MORISHITA Naoki, MOCHIHARA Yoshitaka, ARAKAWA Satoshi, MIURA Masashi, SAKAMOTO Yuki, MATSUURA Yoshiki, SAKAINO Masanori, TAKEMAE Toshiaki, TAKEDA Shinichi, HISADA Shinsaku, IGAWA Hirotaka, TOKUDOME Shinichiro, TAKASHIMA Takeshi
    Journal of Evolving Space Activities 2 n/a 2024年  査読有り
    The Institute of Space and Astronautical Science (ISAS) of the Japan Aerospace Exploration Agency (JAXA) conducts a deep space exploration mission named Demonstration and Experiment of Space Technology for INterplanetary voYage with Phaethon fLyby and dUst Science (DESTINY+). The mission requires a high-performance, compact solid kick stage with a high mass ratio and high system safety. The kick stage employes a newly developed laser ignition system to meet these requirements. We designed a laser unit for upper stages (LUUS), two types of laser-initiated pyrotechnic devices for solid motor ignition and a separation device actuator (the LID and LCTG) for the kick stage system. Optical fiber paths connecting the LUUS to LID/LCTG enables a continuity check by optical frequency domain reflectometry (OFDR). We successfully conducted continuity checks with OFDR and ran laser ignition tests to validate the design in simulating assembly- and launchsite operations.
  • 須田公平, 吹場活佳, 堀伊吹, 川崎央, 小林弘明, 坂本勇樹
    日本冷凍空調学会論文集 41(2) 2024年  
  • 坂本勇樹, 小林弘明, 竹崎悠一郎, 成尾芳博, 谷本圭亮, 川口潤
    日本冷凍空調学会論文集 41(2) 2024年  

講演・口頭発表等

 90

共同研究・競争的資金等の研究課題

 6