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Description
ITER Central Solenoid (CS) at the heart of tokamak progresses its assembly on a platform in the ITER Assembly Hall where the six coil modules are vertically stacked and connected individually to their corresponding bus bar leads, and finally to be installed with all structural components that apply a vertical pre-compression on the completed stack. The status of manufacturing and assembly of CS components are reported here. All CS structural components have been successfully delivered on site whereas the remaining three CS modules are waiting for the Factory Acceptance Test (FAT) to complete. As previously reported, the third in manufacturing, CSM3, has had an incident during FAT and has been designated as a spare module to be tested after repair and to be shipped last. The sixth module, CSM6, had an insulation failure during FAT at a location of complex geometry. A collaborative effort at IO and at GA/USIPO have successfully developed and qualified an insulation repair method that is applied to CSM6. The seventh module, CSM7, successfully completed FAT and is ready to be shipped.
The assembly at ITER has completed the stacking of all lower modules in positions CS3L, CS2L and CS1L. The assembly required negotiations of mm order clearance over several meters long bus bar leads while lifting 110-ton CS module mass to the final position within ±1 mm accuracy. The fourth in stack, CS1U (CSM5), is the first of upper modules which have the terminals pointing upwards. A dedicated alignment tooling is used for the assembly of the coaxial joint between the bus bar leads and the module terminals.
The hydraulics cylinder system for the CS pre-compression, which concept was previously reported as an alternative to the multi-jackbolt system, retrofit the threaded inserts in the Upper Key Blocks. During manufacturing, a weakness was found that lead to design and manufacturing
changes. After successful completion of FAT, the hydraulic system and cylinders have all been delivered.
Disclaimer: The views and opinions expressed herein do not necessarily reflect those of the ITER Organization.
