The secondary electron facility at China Academy of Space Technology (Xi'an)

摘要

The secondary electron emission characteristics of the space metal material are the important parameters to determine the surface charge rate and charge balance potential of the spacecraft. And it is also an important basis for material selection, analysis and design of high power microwave components of space vehicle. In order to accurately measure the secondary electron emission characteristics of space metal materials, the Academy of Space Technology has been developing a secondary electron facility with good performance and mature technology. The multi-functional test-stand is designed and constructed to evaluate characteristics of secondary electron emission of metals in ultrahigh vacuum, such as its emission yield, its energy spectrum and XPS. At present, this facility allows working in a large energy range (between 20eV up to 30KeV), a large temperature range (down to 0°C and up to 400°C), a variety of radiation sources (electrons, photons and ions), and at high vacuum level (10-8Pa). This paper mainly introduces the measurement principles and structures of the secondary electron emission characteristics of the platform, and presents a series of typical test results on the basis of the principles and functions of the test.