Role of aging on the threshold of electrostatic discharge of solar array coverglass.
- Paper number
IAC-14,D5,3,7,x22469
- Author
Dr. Arifur Khan, LaSEINE, Kyushu Institute of Technology, Japan
- Coauthor
Mr. R. Scott Hughes, United States
- Coauthor
Prof.Dr. Yu Chen, Xi'an Jiaotong University, China
- Coauthor
Prof. Kazuhiro Toyoda, Japan
- Coauthor
Prof. Mengu Cho, Japan
- Coauthor
Mr. Andy Gray, United Kingdom
- Year
2014
- Abstract
Coverglass has been widely used over the solar cell of satellite to protect damage due to irradiation of UV, proton, electron, etc. However, charge accumulation due to high-energy proton or electron irradiation or ageing due to thermal cycling may degrade the quality and affect the threshold for electrostatic discharge (ESD). ESD occurs due to differential charging originated from the charge entrapment and transportation through the surface as well as balk material causing the potential difference at different locations. When surface potential of any insulating material is higher than the subsurface/substrate potential, it is named as Inverted Potential Gradient (IPG), where the ESD probability is much higher than the opposite condition. In order to reveal the effect of aging on the threshold of ESD in the IPG scenario, several coverglass (CMG100-AR) samples, produced by Qioptiq, has been aged by thermal cycling (-160ºC to +110ºC, 348 cycles) and high-energy (500 keV) electron beam irradiation. A ground experiment has been conducted by placing virgin and exposed (aged) coverglass in vacuum, irradiated by energetic electron beam to simulate artificial ESD and measured the sample’s surface potential by non-contact method before and after the discharge occurred. Statistical analysis and Weibull distribution confirms that ESD threshold of thermally aged coverglass is higher than the virgin coverglass.
- Abstract document
- Manuscript document
IAC-14,D5,3,7,x22469.pdf (🔒 authorized access only).
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