Simulation and test technique of AO/VUV synergistic effects
- Paper number
IAC-05-C2.5.06
- Author
Prof. Jingyu Tong, Beijing institute of satellite environment engineering, China
- Coauthor
Dr. Lixiang Jiang, Beijing institute of satellite environment engineering, China
- Coauthor
Prof. Hewei Pang, Beijing institute of satellite environment engineering, China
- Year
2005
- Abstract
Simulation and test technique of AO/VUV synergistic effects for space materials evaluation Tong Jingyu, Pang Hewei, Jiang Lixiang,Liu Xiangpeng Beijing Institute of Satellite Environment Engineering P.O.Box: 5142-54 Postal code: 100094 Beijing , China Tel: (86) 010-68746635 Fax:(86)010-68378130 E-Mail: TJYHJGCB@163.com Session No. and Name: C2.5 Space Environment effects and spacecraft protection A facility developed at the Beijing Institute of Satellite Environment Engineering provides a combined environment of AO/VUV, and offers in-situ optical characterization. The facility is based upon an advanced microwave electron cyclotron resonance ion source driven by 1kw RF at 2.45GHz. It provides the advantage of high ionizability and long term durability. The facility can be operated several thousands hours without being maintained. Magnetic field is generated by a NdFeB permanent magnet which is the third generation of rare earth permanent magnets. The magnetic field distributes along the axis of discharging chamber. The ECR zone (0.0875T) is situated about at the center of the discharge chamber. A two planes-electrode system is used as extraction system. The ion beam is extracted by accelerating electrode with an energy of approximately 3000eV.Then the beam is transported through the retarding screen where the beam energy is lowered from 3000eV to 5eV. Neutralization apparatus is composed of tow coaxial stainless steel cylinders. The ions neutralized through electron transfer during a grazing-incidence reflection of an ion beam from a smooth metal surface. As ions exit the decelerating mesh , the effect of space charge in the beam results in the beam expanding radially as it runs through the metal cylindrical cell longitudinally. The ions impinge at grazing incidence on the metal inner surface of the neutralizer and they neutralized by electron pickup. The neutralization rate is above 90The tests of synergistic effects of AO/VUV for some thermal control paints, TO/kapton film,Ge/kapton film have been carried out in the facility. The microbalance, SEM, XPS, solar absorptivity measurement system, surface resistance measurement system were used to analyze the mass loss , surface morphology, surface composition , solar absorptivity , surface resistance of these samples. After exposed, the thermal control paints lost some mass and increased the solar absorptivity. TO/kapton film and Ge/kapton film can be protected well against AO attack during short –term exposed. But after long–term exposed, their mass loss and surface resistance increase. SEM analyses show that many defects were formed on the films. Some TO film and Ge film have been split from the kapton substrate. The reaction mechanism must be the “undercutting” effect. Some new protective film against AO ““undercutting” effect are being developed now.
- Abstract document
- Manuscript document
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