Affiliation:
1. Lanzhou Institute of Physics
Abstract
Secondary electron emission (SEE) processes play an essential role in spacecraft surface charging. It is difficult to study SEE of insulator whose surface cumulates charges by incident electron bombardment because of poor conductivity. This paper investigated the theoretical process of generation, transfer and escape of secondary electrons, and finally the paper presented a mathematical model to calculate the secondary electron emission. We also have improved measurement system to measure total SEE coefficient from dielectric with 1-5 keV electron irradiation which is perfectly fit to mathematical model, and the SEE coefficient with different surface charging is investigated. The results indicate the SEE coefficient decreases with positive charging and increase with negative charging of dielectric surface.
Publisher
Trans Tech Publications, Ltd.
Reference7 articles.
1. K. FUKUNAGA, K. OKAMOTO, and T. MAENO. Space Charge Observation in Aramid / Epoxy Insulations under DC Electric Fields. IEEE TRANSACTIONS ON COMPONENTS AND PACKAGING TECHNOLOGIES, Vol. 29, No. 3(2006), p.502~507.
2. K. Li., E.Q. Xie., H.F. Lin. et al, 2005, Experimental study on high-voltage and high-power solar array secondary discharge, Acta phys. Sin. 54. 2162.
3. H.C. KOONS, J. E. MAZUR, R. S. SELESNICK, et al. The Impact of the Space Environment on Space Systems, 6th Spacecraft Charging Technology Conference, Air Force Research Laboratory (2000).
4. Davies, R. E., Measurements of the secondary electron emission properties of insulators. Ph. D. Dissertation, Utah State University (1999).
5. A.A. Krasnov. Molecular pumping properties of the LHCarc beam pipe and effective secondary electron emission from Cu surface with artificial roughness. Vacuum 73. (2004) p.195.