Assembly procedure of the HT-7U device

The HT-7U superconducting tokamak device mainly consists of superconducting magnets of poloidal and toroidal field, vacuum vessel, thermal radiation shields and cryostat vessel. For its complicated constitution and important influence on the design of the main components, a reasonable assembly procedure of the HT-7U device should be defined carefully. The large size and mass of components with tight installation tolerances results in complicated assembly procedure. Before the assembly procedure, a reference coordinate system will be defined with three fiducial targets on the wall of the test hall by a sophisticated optical metrology system (SOMS). All main components of the device will be installed with respect to this coordinate system. Assembly procedure of one quadrant of the TF subassembly each time in turn with the temporary support is suggested. In this way, an existing 50-ton bridge crane can move all components without necessity of special handling tools. In this paper, a procedure of the HT-7U assembly with one quadrant of the TF subassembly is described.