Charging Characteristics of Spacecraft Dielectric Material at Cryogenic Temperature

• Project/Area Number: 26420816
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Aerospace engineering
• Research Institution: Tokyo City University
• Principal Investigator: Watanabe Rikio 東京都市大学, 工学部, 准教授 (20308026)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000); Fiscal Year 2016: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2014: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
• Keywords: 体積抵抗率 / 極低温 / 宇宙機帯電 / 宇宙環境 / 静電放電 / 誘電体

Outline of Final Research Achievements

Charging analysis of spacecraft is necessary to prevent charging accident of spacecraft. In this study, volume resistivity of insulating material for spacecraft at cryogenic temperature was experimentally investigated because some spacecraft such as infrared space telescopes are operated at cryogenic temperature. The charge storage method was used to obtain volume resistivity from potential histories of dielectric films after electron irradiation. Experimental results of Kapton film indicated that the volume resistivity of short time region at 20 K increased by 569 times compared to room temperature. Surface potential remained kV order for several tens of days which may increase the risk of electrostatic discharge. The volume resistivity of the short time region showed the dependency according to exp(T-1/4).

Research Products

• [Presentation] 宇宙機用誘電体材料の極低温下における帯電特性に関する研究 (2016)
  • Author(s): 澁谷優樹，渡邊力夫，宮坂明宏
  • Organizer: 第13回宇宙環境シンポジウム
  • Place of Presentation: 情報通信研究機構（東京）
  • Year and Date: 2016-11-01
• [Presentation] Surface Potential Characteristics of Electron Irradiated Coverglass for Spacecraft Solar Cell (2014)
  • Author(s): R. Watanabe, N. Higashiyama, K. Kawano, H. Miyake, M. Ohira, T. Okumura and M. Takahashi
  • Organizer: 13th Spacecraft Charging Technology Conference
  • Place of Presentation: Pasadena, CA, USA
  • Year and Date: 2014-06-23 – 2014-06-27