Study Of Impurity Radiation In Edge Layer Of Magnetic Confined Plasmas

Magnetic confined fusion device is a main scheme for the research of controlledthermonuclear fusion. The edge plasma between the core plasma and the first wall of this kind ofdevice always interact with the first wall directly and thus unavoidably generates impurities inplasmas. The impurity category varies in a wide range from low Z to high Z according to differentexperimental conditions and the materials of the first wall. The impurity ions will be forced intothe core region and contaminate core plasmas. The radiation losses caused by impurities reducethe plasma temperature and consequently lead to a reduction of confinement time or disruption. Sothe behavior of edge plasmas play an important role in ash removal, heat removal and impuritycontrol of magnetic confined devices and future fusion reactors. The study of impurities in edgeplasmas is a forefront topic in magnetic confined fusion devices like tokamaks.The transport process in edge plasma is complex so the theoretical study of edge plasma(divertor physics) mainly depends on numerical modeling. EMC3-EIRENE is the only parallelcode for researches of3D edge plasma and impurity transport. It uses Monte-Carlo algorithm tosolve transport equations in fluid model. The large program uses the real boundary of fusiondevice as calculation limit and considers physical parameters of the edge layer, so the modelingresult can provide the characteristics of edge plasmas. It is an important tool for modeling edgetransport in tokamaks and stellarators. This paper used the EMC3-EIRENE code to model the3Dtransport and radiation power of Be impurity sputtered from discrete limiter in the current ramp upphase of ITER. The property of Be impurity profile is generated. Besides, a code programed tomodel the gross radiation power of Be impurity in Scarp-Off-Layer under coronal equilibrium andnon-coronal equilibrium (considering the impurity transport) and compared with the numerical results of EMC3-EIRENE. The results show very good consistency. The work of simulation isimportant for study about the ITER edge plasma transport.