Lyublinski I.E.,National Research Nuclear University MEPhI |
Vertkov A.V.,Public JSC Red Star |
Semenov V.V.,Public JSC Red Star
Problems of Atomic Science and Technology, Series Thermonuclear Fusion | Year: 2015
Capillary-pore systems (CPS) with liquid metals are considered as advanced plasma facing elements (PFE) for application in DEMO-type fusion reactor and fusion neutron source. The main advantages of low melting metals in CPS with respect to solid materials are the possibility to provide surface self-healing and high resistance to degradation of properties. The estimation of opportunity of liquid Li, Ga and Sn application is carried out on the basis of their physical, chemical and technological properties, and with respect to prospective design of the tokamak in-vessel elements. The temperature limit for normal operation of CPS with Li, Ga, Sn is about 550-600 C. For Li application it is determined by appropriate flux to the plasma due to evaporation and for Ga and Sn - by corrosion resistance limit. Surface temperature analysis for possible in-vessel element design has shown the similar power flux limit ∼18-20 MW/m2 for Li, Ga and Sn application at normal operation. It is clear that application of liquid metals with low vapor pressure (Ga, Sn) does not increase PFE operation limit. The property combination, well-demonstrated possibility for surface self-healing, favorable effect on tokamak plas-ma parameters offer the advantage of Li. The CPS with Li has the priority for ELEs and at disruption conditions taking into account very high latent heat of vaporization and screening effect with re-radiation. Now Li is the most attractive and most investigated liquid metal for fusion devices application with CPS.