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Abstract: The nature convection of the liquid LiPb, due to thermal diffusion, in the poloidal channel perpendicular to the strong magnetic field in the blanket has been considered and studied. The cubic enclosure filled by the liquid metal LiPb flow is assumed as the analyzed model. It was numerical simulated by three-dimensional CFD with special MHD code. The Hartmann number is from 20 to 200. The wall of the enclosure was heated by a uniform temperature and the other wall was cooled along two opposite vertical walls, all other walls being adiabatic. The momentum equation and electrical-magnetic equations for the liquid LiPb flow in the enclosure have given. It is assumed the nature convection be steady-state conditions. The velocity and temperature of the LiPb flow with differential Hartmann number is discussed. The temperature distribution is changed due to magnetic field. The heat convection is enhanced by the high Hartmann number which the magnetic field intensified the motion of the LiPb fluid in the side layer. There is a strong thermal coupling, modifying importantly the magnitude of the flow. [ABSTRACT FROM AUTHOR]

Abstract: EAST is a non-circular advanced steady-state experimental device and the first entirely superconducting tokamak in the world. Vacuum system is one of the most important sub-systems of EAST device. Wall conditionings, such as baking, discharge cleaning and boronization, also play a very important role for the plasma operation. Due to Ion Cyclotron Resonance Frequency (ICRF) wall conditioning technique could be carried out in the presence of a high toroidal magnetic field, it is routinely used for wall cleanings on EAST. After the 2nd campaign in 2007, the plasma facing walls was modified to full carbon walls and vacuum system was upgraded to meet the requirement of particles exhaust. This paper will introduce the new statues of vacuum system, such as pumping, fueling and wall conditionings on EAST. Then the vacuum operation and wall conditioning in the 2008 campaign is introduced. [Copyright &y& Elsevier]