EAST (HT-7U) is a large fusion experimental device. It is a full superconductingtokamak with 1 MA of plasma current, 1000 s of plasma duration, high elongation and triangu-larity. It mainly consists of superconducting magnets of poloidal and toroidal field (PF&TF),vacuum vessel (VV), thermal radiation shield (TRS) and cryostat vessel (CV). The significantdifficulty for assembly of EAST is tight installation tolerances, which are in the order of severaltenth of a millimeter. In particular, the alignment of plasma facing components to the magneticaxis of the device is less than ± 0.5 mm.At present, a reasonable assembly process of EAST has been defined, and based on it, thealignment method for EAST, including the survey control network, the location of the maincomponents in different directions, the magnetic axis determination and the accurate positioningof the plasma facing components inside of the vacuum vessel and so on, has been defined by usingthe sophisticated optical metrology system (SOMS).This paper describes the assembly procedure of EAST and the installation tolerances associatedwith the main components. Meanwhile, how to establish the assembly survey control network,magnetic axis determination methods, are introduced in detail.
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