Study of impurities generation via thermal desorption in magnetic compression system

The magnetic compression system (MAGO) proposed by VNIIEF is a new concept of nuclear fusion. The impurities in magnetic compression system may come from thermal desorption process, and wall materials washout by plasma. In this paper, combined with the 2-D temperature distribution of anodic electrode for 5 MA pulsed current flowing through gas pondermotor unit, the impurities generated from thermal desorption process in MAGO chamber were analyzed, consulted to the impurities desorption of copper sample. The TOF spectrum of 3 keV Ar+ scattering from Cu(110), Cu(111) surfaces were measured, and the impurity elements on copper surface were analyzed. According to the results, impurities desorption depends on the temperature and the surface structure of anodic electrode.