JAXA Repository / AIREX 未来へ続く、宙(そら)への英知
65455000.pdf11.15 MB
Other TitleJAXA's Ion Engine Development Initiatives
Author(jpn)船木, 一幸; 篠原, 育; 中野, 正勝; 梶村, 好宏; 宮坂, 武志; 中山, 宜典; 百武, 徹; 和田, 元; 剣持, 貴弘; 村本, 哲也
Author(eng)Funaki, Ikko; Shinohara, Iku; Nakano, Masakatsu; Kajimura, Yoshihiro; Miyasaka, Takeshi; Nakayama, Yoshinori; Hyakutake, Toru; Wada, Motoi; Kenmotsu, Takahiro; Muramoto, Tetsuya
Author Affiliation(jpn)宇宙航空研究開発機構宇宙科学研究所 (JAXA)(ISAS); 宇宙航空研究開発機構情報・計算工学センター (JAXA)(JEDI); 首都大学東京 : 東京都立産業技術高等専門学校; 明石工業高等専門学校; 岐阜大学工学部; 防衛大学校システム工学群; 横浜国立大学工学部; 同志社大学理工学部; 同志社大学生命医科学部; 岡山理科大学
Author Affiliation(eng)Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS); JAXA's Engineering Degital Innovation Center, Japan Aerospace Exploration Agency (JAXA)(JEDI); Tokyo Metropolitan University : Tokyo Metropolitan College of Industrial Technology; Akashi National College of Technology; Faculty of Engineering, Gifu University; School of Systems Engineering, National Defense Academy; School of Engineering, Yokohama National University; Faculty of Science and Engineering, Doshisha University; Faculty of Life and Medical Sciences, Doshisha University; Okayama University of Science
Issue Date2012-03-30
Japan Aerospace Exploration Agency (JAXA)
Publication title宇宙航空研究開発機構研究開発資料
JAXA Rresearch and Development Memorandum
Start page1
End page77
Publication date2012-03-30
AbstractFor the qualification of an ion thruster system for spacecraft, a time-consuming endurance test of more than 10,000 hours is required. The cost for a lifetime qualification test of an ion thruster is hence quite high, and this situation prevents quick development and introduction of an optimal ion thruster for a specific mission. If numerical simulation can replace some of ion thruster's life tests, cost and time for the development of an ion thruster can be drastically reduced. Following this concept, a numerical tool called JIEDI (JAXA's Ion Engine Development Initiative) was developed for the lifetime evaluation of ion thruster's ion optics. To assess the lifetime of the acceleration grid of an ion thruster within affordable computational resources and computational time, the JIEDI tool treats ions and neutrals as flux tubes whose trajectories are calculated using the equations of motion for charged particles and neutrals whereas electrons are approximated as a fluid; this method, usually called the flux tube model, can drastically reduce the computational time in comparison with a full particle-in-cell (PIC) method, in which electrons are treated as particles. In this report, after describing physical model as well as numerical procedure, some numerical wear test results are reported for a single pair of carbon/carbon grid aperture of microwave ion thrusters mu10 and mu20 to evaluate the accuracy and precision of the JIEDI tool. Through comparisons with experiment, the JIEDI code showed good agreement with a real-time 18,000-hrs life test when incorporating the motion of eroded grid materials, the elastic scattering and charge-exchange collisions, the effect of secondary charged ions, and a low-energy sputtering yield model for the energy below 300 V. Numerical error caused by the uncertainty of physical model is also studied and it is found that uncertainty in beam current and plasma parameters cause 10% or less error to estimate grid hole erosion profiles. The grid erosion profile is most sensitive to the uncertainty in sticking factor, which indicates what percentage of eroded grid material arriving at a grid surface will redeposit onto the grid surface.
DescriptionPhysical characteristics: Original contains color illustrations
形態: カラー図版あり
Number of authors: 11
著者人数: 11人
Document TypeTechnical Report
JAXA Category研究開発資料
Report NoJAXA-RM-11-023

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.